TWI277888B - Host, device, and method for controlling communication system - Google Patents

Abstract

A host apparatus capable of adjusting a current to be consumed by a device in accordance with the power supply performance of the host apparatus. A host apparatus (11) has a plurality of communication ports (P1-P3) to which devices (21-23) are connected. A host controller (14) of the host apparatus (11) communicates with the devices (21-23) to acquire device information including the current consumptions of the devices (21-23). A current supply circuit (15) supplies currents to the devices (21-23) connected to the communication ports (P1-P3). If the sum of the currents consumed by additional devices connected to the communication ports (P1-P3) anew and those consumed by the already connected and recognized devices (21-23) exceeds the current value available from the current supply circuit (15), then an MPU (12) changes the currents supplied from the current supply circuit (15) to the devices (21-23).

Description

I277888 IX. Description of the Invention: [Technical Field of the Invention] Field of the Invention The present invention relates to a host device, a device, and a control method for a communication system, which are used for a host device and a plurality of devices for performing serial communication. A host device, a device, and a communication system control method for a communication system in which the devices are operated by the bus of the host device. In the field of the personal computer, the peripheral device (device) with the USB (UniVersal Serial Bus) interface based on the standard of the serial bus interface, that is, the standard of 2. 0〆1.1, is becoming the world standard. Become a popular and unstoppable situation. The USB specification stipulates the ability to supply up to 500 mA of current through a USB cable, and the state in which each device is powered by a cable can operate. That is, the communication system for data communication by the USB interface is powered by a USB-capable computer (hosting device) to the device to drive the device. In recent years, the popularity of devices that can communicate via the USB interface has enabled most devices to be connected to the host device via the USB interface. In this communication system, there are many devices connected to the host device, and once the devices perform excessive power consumption beyond the host device side (current that can be supplied), the system as a whole may cause an unstable state, 20 It is necessary to use techniques to avoid this situation. [Prior Art 3] A communication system in which a host device and a device are connected by a USB interface can be connected and disconnected to each device when the power is supplied to the host device, and if the device is connected to the 1277888, the identification device can be used instantaneously. device. That is, in the communication system, when a novel device is connected to the host device, a negotiation is performed between the host device and the device in order to identify the connected novel device. FIG. 40 shows the host device for identifying a new device. Flowchart of the processing to be performed by the connected device. The host device first issues a request command for requesting the device machine information to the device in step 1, and obtains the machine information sent by the device in response to the request command. Further, at the time when the supply command is issued, a current of 100 mA is supplied to the connected device by the USB cable, and the functional block for the agreement is activated. The machine information obtained in step 1 contains information on the necessary maximum current consumption for driving the device, and the host device shifts to step 2 to determine whether the maximum current consumption can be supplied. When the host device determines that the current 15 is available, the process proceeds to step 3, and the connected device is identified as a usable device, and the device starts power supply to the bus (by the bus to supply power). On the other hand, in the case where the host device determines in step 2 that the maximum current consumption of the device is a current that cannot be supplied, the connected device is not recognized as a usable device. 20 As a result, when the maximum current consumption of the connected device exceeds the supply capacity of the host device, the device is not recognized by the host device, and as a result, communication with the host device is impossible. Further, in the above communication system, the host device controls all devices connected to the network of the system. That is, each connected device performs an operation such as data transfer in response to an instruction from the host device 1277888, and cannot operate if it is not instructed by the host device. As shown in Fig. 41, the transmission using the USB interface is performed in a so-called transaction unit, and the transaction is composed of a plurality of packets. That is, the data is transmitted by the token packet sent from the host device, and the device responds to the token packet and replies with the data packet or the handshake packet. Therefore, the device cannot communicate any information without disregarding the requirements of the host device. Although the device has 10 functions (low power consumption mode, etc.) that operate at this state by reducing the maximum current consumption, it is impossible to notify the information that has reduced the current consumption (information with low power consumption mode function) when connecting. Host device. Further, in a specific example of the function of the low-power storage mode, for example, the host device is configured to reduce the power consumption of the motor by reducing the number of rotations of the disk, and the printing speed or scanning is slowed down in the printer or the scanner. Speed to suppress the power consumption of the motor. As mentioned above, whether or not the bus can be powered by the USB cable is judged unilaterally in the host device. Therefore, if it is judged that the power cannot be supplied from the bus bar, the case where the connected device can reduce the current consumption and the power can be supplied from the bus bar cannot be notified to the host device and the device cannot be started. In addition, when a new device is to be used in this case, it is necessary to unplug the USB cable of the other device after inserting the USB cable of the other device or to connect the power cable to the device. In addition, the host device and the device are connected by a USB interface, and the communication line for operating the device is disclosed in the franchise text or the like by supplying power from the host =*. The technique for avoiding the above problems is not mentioned in Patent Document 1 and the like. SUMMARY OF THE INVENTION An object of the present invention is to provide a host device, a device, and a communication system control method for adjusting a current consumption of a device in a communication system in which a plurality of devices are operated by power supply from a busbar of a host device, in accordance with a power supply capability of the host device. [Patent Document 1] JP-A-2001-242965 SUMMARY OF INVENTION Summary of the Invention A first aspect of the present invention provides a host device. The host device is powered by a plurality of bus bars for performing serial communication, and the host device has a plurality of communication ports for connecting the plurality of devices, connecting the plurality of communication ports, and a communication circuit for obtaining a plurality of device information including current consumption of the plurality of devices from the plurality of devices, and a current supply circuit for supplying current to the plurality of devices and connecting the communication circuit by connecting the plurality of devices to the plurality of devices; And the current supply circuit, when the total value of the current consumption of the device newly connected to the plurality of communication devices and the current consumption of the device connected to the identification device exceeds the current that can be supplied by the current supply circuit, the supply is changed from the current supply circuit to A control circuit for supplying current to the plurality of devices. A second aspect of the present invention provides a host device. The host device is powered by a plurality of busbars for serial communication, the host device having a plurality of communication devices connected to the plurality of devices, connecting the plurality of communications, and And a communication circuit for obtaining a plurality of machine information including current consumption of the plurality of devices, and displaying the plurality of machine information and the plurality of devices for selecting an operator to connect each communication device as a use state or not using the communication between the plurality of devices; a display device for selecting a state, connecting the communication circuit and the display device, and controlling a supply current of each device for each of the communication devices according to a current consumption of the plurality of devices and a result of selection by an operator according to the selection information. Control circuit. A third aspect of the invention provides an apparatus. The device is powered by a host device for performing serial 10-column communication. The device has an internal circuit, and the internal circuit includes a bus bar for communicating with the host device. a communication circuit, and operating and controlling the circuit according to the communication data sent by the communication circuit, the control circuit is connected to the internal circuit, and when the device is connected to the host device, the current consumption of the 15 internal circuit exceeds the host When the device can supply current, the aforementioned current consumption is reduced. A fourth aspect of the present invention provides a method of controlling a communication system. The control method of the communication system is a controller 20 method for operating the plurality of devices by powering a plurality of devices from a host device by performing a plurality of bus bars for serial communication, the control method having the foregoing host device from the foregoing plurality When the device obtains the device information including the current consumption of each device, and the total value of the current consumption of the device newly connected to the host device and the current consumption of the device connected to the identification device exceeds the current that can be supplied by the host device, the foregoing The host device changes the amount of the supply current to be supplied to each device 1277888 in accordance with the current that can be supplied. A fifth aspect of the present invention provides a method of controlling a communication system. The control method of the communication system is a control method for operating the device by powering the device from the host device by using a bus bar for serial communication, the device 5 having an internal circuit, the internal circuit including the host The communication circuit for communicating with the device operates according to the communication data sent by the communication circuit, and the control method includes when the current consumed by the internal circuit exceeds the current that can be supplied by the host, The device 10 reduces the current consumption of the internal circuit in conjunction with the supplyable current. The sixth aspect of the present invention provides a control method for the communication system. The communication system and the charging control method are control methods for operating the plurality of devices from a host device by using a plurality of bus bars for performing serial communication, and the control method includes the foregoing host device from the foregoing The plurality of devices obtain 15 〇a steps of the machine information of the current consumption of the plurality of devices, and display the device information and the use of the devices in the display device provided in the host device to enable the operator to select the devices as the use The step of selecting the state or the unused state, the step of controlling the supply current to each of the two devices according to the current consumption included in the device information and the result of the selection by the operator according to the selection information. A seventh aspect of the present invention provides a host device. The host device is powered by the plurality of busbars for serial communication, so that the plurality of device operators, the host computer, the day of absence, and the clothing have a plurality of communication ports for connecting the plurality of devices, and connecting the foregoing plurality And communicating, by means of the communication with the plurality of devices, the communication circuit including the plurality of machine information of the current consumption of the plurality of devices, connecting the communication circuit, and setting the device in an unused state to the use state When the increased current consumption exceeds the current that can be supplied by the current supply circuit, the control circuit that supplies the current amount of the plurality of devices connected from the current supply circuit is changed. The eighth aspect of the present invention provides a method of controlling a communication system. The control method of the communication system is a control method for operating the plurality of devices by powering a plurality of devices from a host device by using a plurality of bus bars for performing serial communication, the control method including the foregoing host device obtaining from the plurality of devices 10. The step of including the device information of the current consumption of the plurality of devices, the step of the host device determining that it is possible to supply a current corresponding to the required value of the device in an unused state, and changing the supply from the current in the case where the current cannot be supplied. The step of supplying the amount of current of the complex noise of the circuit connection. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic block circuit diagram of a host device according to a first embodiment of the present invention. Figure 2 shows a flow diagram for the process of connecting to identify a novel device. Fig. 3 is a diagram showing an agreement between the host device and each device. 20 Fig. 4 is a diagram showing an agreement between the host device and each device. Fig. 5 is a diagram showing an agreement between the host device and each device. Figure 6 shows an outline of the agreement between the host device and each device. Fig. 7 is a diagram showing an agreement between the host device and each device. Figure 8 is a diagram showing the agreement between the host device and each device. Fig. 9 is a schematic block circuit diagram of an apparatus according to a second embodiment of the present invention. Figure 10 is a circuit diagram of the switching unit. Fig. 11 is a flow chart showing the connection identification processing of the second embodiment. 10 Fig. 12 is a schematic block circuit diagram of an apparatus relating to the third embodiment of the present invention. Fig. 13 is a flow chart showing the connection identification processing of the third embodiment. Fig. 14 is a flow chart showing the connection recognition processing of the fourth embodiment of the present invention. 15 Fig. 15 is a schematic block circuit diagram of a host device relating to a fifth embodiment of the present invention. Fig. 16 is a block circuit diagram showing the connection state of each device of the host device. Fig. 17 is an explanatory diagram showing a status window. 20 Fig. 18 is a block circuit diagram showing the connection state of each device of the host device. Fig. 19 is an explanatory diagram showing a status window. Fig. 20 is an explanatory diagram showing a status window. Figure 21 is a flow chart showing the processing of the status window. 1277888 Fig. 22 is an explanatory diagram showing the connection state of each device of the Hub. Figure 23 shows an explanatory diagram of the status window of the Hub. Fig. 24 is an explanatory diagram showing the connection state of each device of the Hub. Figure 25 shows an explanatory diagram of the status window of the Hub. 5 Figure 26 shows an explanatory diagram of the connection status of each device of the Hub. Figure 27 shows an explanatory diagram of the status window of the Hub. Fig. 28 is a circuit diagram showing another example of the switching unit. Figure 29 is a schematic block circuit diagram of a host device relating to a sixth embodiment of the present invention. 10 Fig. 30 is a flow chart showing the device control processing of the sixth embodiment. Fig. 31 is an explanatory diagram showing a status window. Fig. 32 is an explanatory view showing a status window. Figure 33 shows an explanatory diagram of the status window. Figure 34 is a block diagram showing the outline of a host device in accordance with a seventh embodiment of the present invention. Fig. 35 is a flow chart showing the device control processing of the seventh embodiment. Fig. 36 is an explanatory diagram showing the state of the function execution flag. Fig. 37 is a flow chart showing the device control processing of the eighth embodiment of the present invention. 20 Fig. 38 is a flow chart showing the device control processing of the eighth embodiment. Fig. 39 is an explanatory view showing a warning window. Figure 40 shows a flow diagram for the process of connecting to identify a novel device. Figure 41 is an explanatory diagram for explaining the data transfer of USB. [Embodiment 3 13 Ϊ 277888 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment in which the present invention is embodied will be described based on the drawings. Fig. 1 is a schematic block circuit diagram of the host device 11 of the first embodiment. The host device (specifically, the personal computer) 11 includes an MPU 12, a memory unit 13, a main controller 14, a current supply circuit 15, and a current monitoring circuit 16. The host device 11 is connected to the MPU 12, the memory 13, the main controller 14, and the current supply circuit 15 via the internal bus bar 17, and transmits and receives data to each other. The host device 11 is provided with three communication ports P1 to P3 constituting a USB interface, and the first to third devices 21 to 23 are connected to the respective communication ports pi to P3 via a USB cable C1. Each of the devices 21 to 23 is a busbar power device that is powered by the host device π and operated by the USB device C1. The control circuit, i.e., the MPU 12, performs various processes in accordance with the program stored in the memory 13 and collectively controls the host device 11. The program stored in the memory 13 contains a communication program for controlling the main controller 14 or the current supply circuit 15 in accordance with the communication program. The main controller 14 is a communication circuit based on the USB specification, and controls communication between the devices 21 to 23. The main controller 14 connects the first to third devices 21 to 23 by the respective communication ports P1 to P3 and UCB. The main controller 20 is provided with a register 14a which can store machine information acquired from the respective devices 21 to 23. Specifically, when each of the devices 21 to 23 is connected to the communication ports P1 to P3, the host device 11 performs a process for connection identification (which is agreed between the devices 21 to 23), and acquires the machine information obtained therefrom (including The device name or the maximum current consumption information is stored in the register 14a of the main controller 14. The I277888 current supply circuit 15 supplies currents corresponding to the maximum current consumption included in the machine information of the register 14a to the respective devices 21 to 23 by the communication ports pi to p3 and the UCB cable C1. In the first embodiment, the switch circuit 525 is provided in the middle of the current passing path connecting the respective communication ports pi to P3 of the current supply circuit 15. The current monitoring circuit 16 detects the current flowing to the communication ports pi to P3, and monitors so that the communication currents P1 to P3 do not flow the predetermined overcurrent to the devices 21 to 23 (current current monitoring exceeding the maximum current consumption of each device) When the circuit 16 detects an overcurrent, the switch circuit 25 is turned off (〇FF) to electrically block the current supply circuit 15 and the communication ports P1 to P3. Thus, for example, when the device 21 fails and flows current, The current flowing to the device 21 is blocked

The path avoids the flow of current through. As a result, the operation of the communication system constituted by the host device U and the respective devices 22, 23 can be prevented from being unstable. Next, the processing for identifying the connection of the novel device in the communication processing performed by the host device η2ΜΡυΐ2 15 will be described in accordance with the flowchart of Fig. 2. Further, the processing of Fig. 2 starts when any of the devices 21 to 23 is connected to the host device. Here, a case where the third device 23 is newly connected in a state in which the first and second devices 21 and 22 are connected to identify the host device will be described as an example. Once the device 23 is connected to the communication port p3 of the host device 11, the MPU 12 first 20 first resets the bus bar in step 100, the connection is completed, and then the process proceeds to step 110 to perform address setting of each device 21 to 23 including the devices 21 and 22. . After the address setting is completed, the MPU 12 proceeds to step 120 to acquire the machine information of the device 23. Specifically, the MPU 12 causes the main controller 14 to operate, issues a request command (Get Descriptor) to the newly connected device 23, and stores the machine information of the response 15 1277888 sent from the device 23 in the register 14a of the main controller 14. Machine information includes information such as machine name, manufacturer, and maximum current consumption. The MPU 12 reads the machine information of the connection completion devices 21, 22 and the device 23 connected this time from the register 14a in step 13, and determines whether the maximum current consumption of the device 23 can be supplied based on the machine information. Here, the current that can be supplied from the current supply circuit 15 is set as the program data in advance in the memory 13 to compare the current that can be supplied with the maximum current consumption of the device 23. Further, when the general-purpose power source 1C is used as the current supply circuit 15, a current measurement circuit 10 that can measure the current that can be supplied from the current supply circuit 15 can be set, and the current used in the initialization process of the host device 11 can be compared. The supply current of the current supply circuit 15 and the maximum current consumption of the device 23 are measured by the measurement circuit. When it is determined in step 23 that the supply is available, the MPU 12 proceeds to step 140 to operate the main controller 14, and issues a command (Set Configuration) to the device 23 notifying the connection identification, and then ends the present process. On the other hand, if it is determined in step 130 that the supply is impossible, the mpu 12 shifts to step 150 to change the amount of the supply current. That is, the MPU 12 changes the 20-quantity including the supply current to the devices 21 to 22 of the connected devices 21 and 22 and the novel device 23 within the range in which the current supply circuit 15 can supply the current. However, in step 150, only the change amount of the supply current is calculated, and the actual supply current to each device is the current that maintains the current state. Next, in step 160, the MPU 12 operates the main controller 14 to transmit the changed current value to the device to be changed in the supply current. Thereafter, the MPU 12 confirms in step 170 whether the device accepts the current value (whether or not 16 1277888 operates). Specifically, in order to notify the changed current value, the MPU 12 issues a setting command (Set Descriptor) for consuming current from the main controller 14. If the device receiving the setting command sets the current value specified by the setting command to the corresponding 5 stream value, the ACK packet is replied, and if it is an impossible current value, the STALL packet is answered. The MPU 12 determines whether the device is operational based on the ACK packet or the STALL packet from the device reply. When the device to be changed is in the plural, the setting command of the current consumption is issued to all the devices in step 160, and it is judged in step 170 whether or not the identity (ACK packet) from all the devices has been obtained. In the case where the device is approved in step 170, the MPU 12 shifts to step 180 to change the current value supplied from the current supply circuit 15 to the devices 21 to 23. At step 140, the device 23 issues a command (Set Configuration) for notifying the connection identification, and the process ends. 15 If the device does not obtain the approval of the device in step 170, the MPU 12 proceeds to step 190 to determine whether the amount of supply current to each device can be changed (re-adjustment), and returns to step 150 when it is determined that the device can be changed again. The processing after step 150 is performed again. On the other hand, when it is determined that there is no room for further change, the process proceeds to step 200 without recognizing (set c〇nfigurad〇n) 20 the novel connection machine, that is, the device 23, and the present process is ended. Next, in the case of the recognition processing of the novel device, a specific example of the agreement between the host device 11 and each of the devices 21 to 23 will be described based on Figs. 3 to 8 . Further, in the first embodiment, the maximum supply current supplied to each of the devices 21 to 23 by the host device is 1A. Further, the maximum current consumption of each of the devices 21 to 23 is 17 mA, the first device 21 is 500 mA, the second device 22 is 300 mA, and the third device 23 is 300 mA. Further, the first device 22 has a function of reducing the maximum current consumption from 500 mA to 300 mA, and the third device 23 has a function of reducing the maximum current consumption from 300 mA to 250 mA. Further, the second device does not have the function of reducing the maximum current consumption by 5, and cannot change the maximum current consumption from 300 mA. First, as shown in Fig. 3, the first and second devices 21, 22 are connected to identify the host device 11 and operate in accordance with the power supply of the bus bar, and the third device 23 plug-ins the new connection. As a result, as shown in Fig. 4, the host device 11 issues a command (Set Descriptor) requesting machine information to the third device 23. The device 23 responds to the request command and informs the machine information including the parameter (]^1&?0\¥61> 2 30〇111 8) of its own maximum current consumption. The host device 11 determines whether the maximum current consumption of 300 mA is a specification that can be supplied by itself. This is because the host device 11 has supplied a total of 800 mA to the first and second devices 21 and 22, and the remaining usable capability (specification) is 15 200 mA (= 1000 - 500 - 300), so that it is judged that the third device cannot be used. 23 supply large current consumption (= 300mA). The newly connected third device 23 cannot be recognized in the case where the specifications of the host device 11 are technically exceeded. In contrast, in the first embodiment, each of the devices 21 to 23 is required to lower the specification so as not to exceed the supplyable current (=1A), and 20 to confirm whether each of the devices 21 to 23 can reduce the consumption current of the specification. When each of the devices 21 to 23 is operable, the amount of supply current to each of the devices 21 to 23 is changed to identify the newly connected third device 23. The specification specification (Set Descriptor) issued by the host device 11 for each device 21 to 23 is a specification descriptor (Configuration 18 1277888).

Descriptor) Max Power Field. The host device 11 assigns and issues the current value of the target specification in the category of maximum current consumption. Further, the maximum current consumption of the device in the USB specification is defined as the eighth parameter of the specification descriptor. In the first embodiment, the maximum current consumption of each of the devices 21 to 23 is 1100 mA, and in the case where the first and second devices 21 and 22 are newly connected to the third device 23, with respect to the host device 11 Available in specifications (1000mA), the capacity of 100mA is insufficient. Therefore, the host device 11 starts to adjust the agreement for the amount of supply current to each of the devices 21 to 23. The host device 11 tries to secure a shortage of 100 mA from a state in which the supply current to each of the devices 21 to 23 is lowered by, for example, 50 mA which is one-half of the shortage. Specifically, the host device confirms whether or not the device 22 can operate at a current consumption reduction of 250 mA of 50 mA as shown in Fig. 5. That is, the host device 11 transmits 250 mA data to the second device 22 in the maximum current consumption range of the command (Set Descriptor). However, since the second device 22 is required to operate, a supply current of 3 mA is required. Therefore, the STALL packet is used to respond to the inability to respond. Next, as shown in Fig. 6, the host device 11 interrogates the first device 21 whether or not 20 can operate at 450 mA with a maximum current consumption reduction of 50 mA. At this time, the host device 11 transmits 450 mA of data to the first device 21 in the maximum current consumption range of the command (Set Descriptor). Since the first device 21 can reduce the supply current to 300 mA, it is possible to respond to the responsiveness of the ACK packet and recognize that the supply current is 450 mA. 19 1277888 Next, the host device 11 interrogates the third device 23 as shown in Fig. 7 to operate at 250 mA with a maximum current consumption reduction of 50 mA. At this time, the host device 11 transmits 250 mA data to the third device 23 in the range of the maximum current consumption of the command (Set Descriptor). Since the second device 23 reduces the supply current to 250 mA, it is also possible to respond to the responsiveness of the ACK packet and recognize that the supply current is 250 mA. As shown in Fig. 8, the host device 11 lowers the supply current to the first device 22 to 450 mA, and sets the supply current supplied to the third device 23 to 250 mA. Thereby, the first device 21 switches to the low current consumption mode, and the third device 23 starts operating in the low current consumption mode. As described above, the host device 11 can connect and recognize the third device 23 and form a communicable state with all of the devices 21 to 23. Further, the above description has explained the case where the identification of the novel device 23 can be connected to the supply current of the devices 21 and 22 which have been connected and identified. On the other hand, even if the supply current to the devices 21 and 22 is changed, if the supply current of the newly connected device 23 cannot be ensured, the device 23 cannot be recognized as in the conventional art. In this case, communication between the host device 11 and each of the devices 21 and 22 is maintained for the supply current before the connection of the first and second devices 21 and 22 to the local supply device 23. 2〇 Further, the order of agreement for each of the devices 21 to 23 described with reference to Figs. 5 to 8 can be appropriately changed. That is, the above specific example explains the change of the supply current for the device 22 that has completed the connection. However, first, when the novel device 23 is inquired to reduce the supply current without adjusting the supply current to the device 23, the connection can be completed. The devices 21, 22 interrogate to reduce the supply current. 20 1277888 Of course, the reduced current value of 50 mA calculated by the host device 11 is an example, and can be agreed upon according to an arbitrary calculation result. For example, in Fig. 6, it can be confirmed whether the first device 21 can operate at 400 mA which reduces the maximum current consumption specification of 100 mA. In this case, since the first device 21 can respond even if the supply current is reduced to 300 mA, the ACK packet can be used to respond to the corresponding purpose, and the operation of supplying current at 400 mA is recognized. Since the supply current to the novel device 23 can be ensured by reducing the supply of current to the first device 21, a protocol for reducing the supply current of the novel device 23 is not required (see Fig. 7). The host device 11 of the first embodiment of the present invention has the following advantages. (1) When the current consumption of the devices 21, 22 and the novel device 23 of the connection recognition completion exceeds the supply capability of the current supply circuit 15, the host device 11 changes the supply current to each of the devices 21 to 23 in accordance with the capability thereof. . In the first embodiment, the device 23, which is newly connected to the host device 11, further changes the supply current to the device whose connection 15 is completed. The supply current for operating the novel device 23 can be ensured by the change of the supply current, and the number of devices identified by the host device 11 can be increased as compared with the prior art. (2) The current can be supplied to the devices 21 to 23 by means of a command (Set Descriptor) based on the USB specification, and the state of any of the 20 ACK packets and the STALL packets is received from the devices 21 to 23 to determine the state of any of the 20 ACK packets and the STALL packets. Whether the device works. In this case, in the case where the agreement for changing the supply current to the devices 21 to 23 is performed by the existing command, the program to be executed can be easily made, which is advantageous for practical use. (3) The host device 11 has a current monitoring circuit 16 that detects currents flowing through the communication ports P1 to P3 and monitors them by the communication ports P1 to P3 so that the devices 21 to 23 do not flow a predetermined value or more. Over current. When the current monitoring circuit 16 detects an overcurrent, it can avoid adverse effects of the body communication system by stopping the supply current to the device. 5 Next, a second embodiment in which the present invention is more embodied will be described. Fig. 9 is a schematic block circuit diagram of the apparatus 31 of the second embodiment. The device 31 is, for example, a recording and reproducing device that uses the optical disk 32 as a recording medium, and includes an MPU 33, a memory 34, a USB controller 35, a power controller 36, a device controller 37, and a disk rotation motor 38. The MPU 33 is connected to the memory 34, the USB controller 35, the power controller 36, and the device controller 37 via the internal bus bars 39, and transmits and receives data to each other. The device 31 is provided with a USB communication port P0, and is connected to the host device 41 by the USB cable C1 into which the communication port is inserted. The device 31 of the second embodiment is an electric device that operates in accordance with power supply from a busbar from the host device 41. The control circuit, i.e., the MPU 33, performs various processes in accordance with the program stored in the memory 34 and collectively controls the device 31. Further, the private storage stored in the memory 34 includes a communication program for controlling the USB controller 35 and the power controller 36 or a data processing program for controlling the device controller 37. The communication port P0 is connected to the USB controller 35 via the switch unit 42, and the communication data from the main unit device 41 is transmitted to the USB controller 35 through the signal lines D+, D- and the switch unit 42. As shown in Fig. 1, the switching unit 42 includes two switching circuits 42a and 42b. Each of the switch circuits 42a, 42b is controlled in accordance with control signals Sa, Sb from the MPU 33 to connect or disconnect the signal lines D+, D_ of the link communication port P0 and the USB controller 35. The switch unit 42 (each switch circuit 42a, 42b) is turned off (OFF) according to the control signals Sa, Sb from the 22 1277888 MPU 33, and the device 31 is cut off from the host device 41. The USB controller 35 is USB-compliant. The communication circuit between the control 5 and the host device 41 is the standard communication circuit. Specifically, the xjsb controller 35 transmits the data (write data) contained in the packet received from the host device 41 to the device controller 37. Further, the USB controller 35 generates a transmission packet based on the transmission of the material (read data) from the device controller 37 and transmits it to the host device 41. The device controller 37 drives the motor 38 to rotate the optical disk 32, read data from the optical disk 32 10, or write data to the optical disk 32. The power controller 36 is connected to the communication port P0 (referred to as a power terminal of VBUS), and is supplied with current from the host device 41 via the USB cable C1 and the communication port P0. The power controller 36 manages the supply current supplied to the internal circuits including the MPU 33, the memory 34, the USB controller 35, and the device controller 37. Specifically, the power controller 36 includes a register 36a that stores information such as a current consumption value of the storage device 31, a switch circuit 36b that blocks a current passing path to the internal circuit, and a control unit 36c that controls a supply current to the internal circuit. . The control unit 36c adjusts the current supplied to the MPU 33, the memory 34, the USB controller 35, and the device controller 37 in accordance with the current consumption value of the register 36a. Further, the switch circuit 36b is turned "ON" or "OFF" in accordance with a control signal from the MPU 33. The switch circuit 36b is normally turned on, but in a case where the host device 41 cannot be connected to the identification device 31, the switch circuit 36b cuts off the power of the device 31 in a closed state. Next, the processing for identifying the connection of the host device 41 in the communication processing of the line 1 1277888 performed by the MPU 33 of the device 31 will be described in accordance with the flowchart of FIG. The processing of Fig. 11 is started when the device 31 is connected to the host device 41. First, the 'MPU 33 waits until the request instruction (Get Descriptor) for requesting the machine information from the host device 41 is received in step 210. When the MPU 33 receives the request command, the MPU 33 transfers to the step 220, and after transmitting the transmission packet including the device information of the device 31 from the USB controller 35 to the host device 4, the MPU 33 transfers to step 230 to determine whether the slave device has been received. When the request command (set configuration) is received, the processing proceeds to step 240 and the start processing of the device 31 is performed, and the processing is terminated. When the host device 41 waits for the supply capacity of the maximum current consumption included in the machine information transmitted in step 220, the host device 41 issues a start request command and supplies the maximum consumed current to the device 31 via the USB cable C1. Therefore, after the start processing of the device 31 is performed in step 240, the data writing or reading operation can be performed at the maximum current consumption required. On the other hand, in the case where the host device 41 does not have the ability to supply the maximum current consumption of the device 31, the host device 41 does not issue the start request command. In this case, the conventional device does not have the supply current necessary for the identification of the connection of the host device 41. On the other hand, in the second embodiment, when the current supply capability of the host device 41 is insufficient, the processing for connecting the host device 41 is performed by reducing the current consumption of the host device 41 (processing after step 25). Specifically, in step 250, the MPU 33 determines whether a predetermined time has elapsed since the time of transmitting the machine information, and has returned to 24 1277888 step 220 without a predetermined time. When the MPU 33 has elapsed for a predetermined period of time, it is judged that the host device 41 cannot supply the maximum current consumption required by itself, and the process proceeds to step 260. The MPU 33 determines whether the maximum current consumption can be changed. In step 260, the MPU 33 determines that it is not possible to change the current consumption value, and proceeds to step 270, and sets the switching circuit 36 of the power controller 36 to the off state and cuts off the power of the device 31, and ends the present process. On the other hand, if it is determined in step 260 that the current consumption can be changed, the MPU 33 proceeds to step 280 to change the machine information of the device 31 stored in the register 36a of the power controller 36. Here, the consumption current value of the machine information 10 is reduced to a predetermined value, and the operation mode of the device controller 37 is set to an operation mode (low current consumption mode) in which the current value should be reduced. Thereafter, the MPU 33 is turned on only after the respective switch circuits 42a, 42b of the switch unit 42 are turned off at a predetermined time in step 290. The device 31 is temporarily turned off from the host device 41 in accordance with the switching operation of the switching unit 421, and the process returns to step 210. Once the device 31 is temporarily turned off in accordance with the processing of step 290, the host device 41 judges that the device 31 has been reconnected. At this time, the host f sets 41 to issue a request command requesting machine information. The device 31 that has received the request in step 210 transfers to step 220 to resend the machine information. / VIII. In step 280, the current consumption value that has been reduced to a small current value is retransmitted. The host device 41 does not supply the reduced current consumption. The start request command will be issued, so the step after the step 250 is performed again. In contrast, the host device 41 issues a start request command when the reduced current consumption can be supplied. Thus, the MPU 33 shifts from step 23 to step 240 to perform the startup processing of the device 31, and then ends the processing. By the start-up processing of the device 31, the device 31 can perform a data writing or reading operation with a reduced current consumption. The apparatus 31 of the second embodiment of the present invention has the following advantages: (1) the host device 41 is connected to the device 31, and when the current consumption of the internal circuit of the device 31 exceeds the supply capability of the host device 41, the host The device 41 does not issue a request for the request to start the device 31, so the MpU 33 judges the main 曰 to reduce the current consumption of the device 31. When the host device 41 can supply 10 reduced current consumption, the device 31 is identified by the host device 41 and the device 31 is operated according to the power supply from the host device 41. (2) In step 31 'Setting The switch unit 42 that connects the communication port υρ〇 (υι§Β cable ^ C1) to the USB controller 35 can be temporarily turned off. Further, a register for storing the current consumption of the device 31 is provided in the power control unit 36. In the case where the supply capacity of the host device 41 is insufficient, the current consumption of the device 31 of the register 36a is lowered, and then the switch unit 42 is turned off only for a predetermined time. By the switching operation of the switching unit 42, the connection between the communication port P0 and the USB controller 35 is temporarily cut off, and the situation in which the device is reconnected to the host device 41 can be recognized. 2. The host device 41 issues an instruction requesting machine information of the device 31, and the device 31 responds to the command and transmits the changed current consumption. In this way, the current consumption of the device 31 can be changed without the instruction of the host device 41 by the operation on the side of the device 31. (3) The MPU 33 determines that the power consumption of the internal circuit of the device 31 cannot be reduced. 26 1277888 When the flow is performed (when the device 31 is not recognized), the power supply of the standby 31 is blocked by the switch circuit 361 of the memory controller 36. As a result, wasteful current consumption of the device 31 which is not recognized by the host device 41 can be prevented. Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. Fig. 12 is a schematic block circuit diagram of a device 43 relating to the third embodiment of the present invention. The same components are assigned to the same components as those of the device 31 of the second embodiment. Hereinafter, the differences from the second embodiment will be mainly described. That is, the device 43 of the third embodiment is different from the second embodiment in that the controller 44 controls the speaker 45. Further, the device 43 is provided with a level switch 46 which is a setting unit, and the register 36 & of the power controller 36 can memorize the current consumption value calculated based on the operation amount (set value) of the level switch 46. The device 43 is connected to the host device 41 by the USB cable C1. When the host device 41 requests the device information from the device 43, the device 43 requests the host device 41 to consume the current value corresponding to the set value of the level 15 switch 46. The processing performed by the MPU 33 of the device 43 for connection identification will be described below in accordance with the flowchart of Fig. 13. The processing of Fig. 13 starts when the device 43 is connected to the host to rotate the 41. First, in step 310, the MPU 33 calculates the current consumption value corresponding to the set value 〇 of the level switch 46, and recalls the calculated value as the current consumption value of the machine information in the register 36a of the power controller 36. Thereafter, the MPU 33 shifts to step 320 and stands by until it receives a request instruction (Get Descriptor) of the machine information from the host device 41. Upon receiving the request command, the MPU 33 transfers to step 330 to transmit the machine information of the device 43 to the host device 41. 27 1277888 To set = 3^41, the current consumption value contained in the machine can be supplied to the center: Γ, the start request command is issued from the host device 41. The post C40 shifts to step 350 to perform the startup processing of the device 43. Thereby, it is possible to output the sound to the speaker 45 by requesting the flow of the host device 41. On the other hand, in the case where the host device 41 cannot supply the current consumption of the device 43, the start request request is not issued from the host device 41. In this case, the MPU 33 repeats the processing of steps 340 and 360 from the time when the transmitter || information is numb, and expects to go to step 37 after a predetermined time elapses. The MPU 33 determines in step 370 whether the level switch 46 is operated and the value set has been changed. When the set value of the level switch 46 has been changed, the Mpu 33 shifts to step 380 and recalculates the value of the current consumption corresponding to the set value of the level switch 46 to be stored in the register 36a of the power controller 36. Thereafter, the MPU 33 turns on the switch unit 42 only after a predetermined time in step 390, and then turns on, whereby the device 43 is temporarily turned off from the host device 41 and then returns to step 320. Once the device 43 is temporarily turned off by the processing of step 390, the host device 41 judges that the device 41 is reconnected. At this time, the host device 41 issues a request for the request for machine information. The device 43 that receives the request command in step 320 moves to step 320 to transmit the machine information again. Here, the current consumption value corresponding to the set value of the changed level switch 46 is sent again. Since the host device 41 does not issue the start request command in the case where the current consumption value after the change cannot be supplied, the processing after step 360 is performed again. On the other hand, when the host device 41 can supply the value of the current consumption of 1277888 after the change, the host device 41 issues a start request command. Therefore, the MPU 33 shifts from step 340 to step 350 and performs a startup process to end the process. By the start-up process of step 43, the device 43 can be made to output the sound from the speaker with the changed current consumption. The apparatus 43 of the third embodiment of the present invention has the following advantages. (1) The current consumption of the device 43 exceeds the supply capacity of the host device 41, and when the host device 41 does not recognize the device 43, once the set value of the level switch 46 is changed, the current consumption due to the set value is calculated and stored in the power The register of the controller 36. The device 43 10 is then recognized by the switching action of the switch unit 42 to reconnect the host device 41. At this time, the device 43 can notify the host device 41 of the changed current consumption in response to the request command issued from the host device 41. When the host device 41 cannot supply the changed current consumption, the host device 41 recognizes the device 43 and the busbar power supply from the host device 41 causes the device 43 to operate. (2) In the case where the host device 41 is notified that the current consumption is supplied from the host device 41 in response to the current consumption value of the set value of the level switch 46, the supply current corresponding to the set value of the level switch 46 can be made. Device 43 operates. The fourth embodiment of the present invention will be described below. In the fourth embodiment, the configuration of the device 31 is the same as that of the second embodiment shown in Fig. 9. Further, the host device 41 of the fourth embodiment notifies the current that the device 31 can supply when it is determined that the current consumption of the device 31 cannot be supplied when the connection is recognized. The device 31 reduces the state of the current consumption in cooperation with the supply current of the host device 41, and causes the host device 41 to recognize the device 31. Fig. 14 is a flow chart for explaining the connection identification of the device 31 of the fourth embodiment. Further, steps 410 to 440 and 470 to 490 in Fig. 14 are the same as steps 210 to 240 and 270 to 290 of the second embodiment, and the processing of steps 450 and 460 is different from the second embodiment. Hereinafter, the differences from the second embodiment will be mainly described. 5, that is, in the case where the current consumption value of the device 31 transmitted in step 420 exceeds the capability of the host device 41 (current value that can be supplied), the host device 41 does not issue a request command requesting activation of the device 31 to notify the device 31. The amount of current that can be supplied. In this case, the MPU 33 of the device 31 receives the current value that the host device 41 can supply at step 450. Moving to step 460, the MPU 33 determines whether the device 10 31 can operate with the available current value of the host device 41. In the case where it is determined in step 460 that the operation is impossible, the MPU 33 shifts to step 470 to turn off the current of the device 31 in a state where the switch circuit 36 of the power controller 36 is turned off, and the present process is terminated. On the other hand, in the case where it is determined in step 460 that it is operable, the MPU 33 15 shifts to step 480 to change the machine information of the device 31 stored in the register 36a of the power controller 36. Here, the current consumption value included in the machine information is changed to the same value as the supply current value of the host device 41. Further, the Mpu 33 sets the operation mode of the device controller 37 to the current consumption mode in response to the changed current value. After that, the MPU 33 is turned on only after the switch unit 42 is turned off at the predetermined time in step 490, whereby the device 31 is temporarily turned off from the host device 41 and then returns to step 410. Once the device 31 is temporarily turned off in accordance with the processing of step 490, the host device 41 judges that the device 31 has been reconnected, and therefore issues a request for the request for machine information 30 1277888. Upon receiving the request command at step 410, the MPU 33 moves to step 420 to resend the machine information changed at step 48. Since the current value that can be supplied from the host device 41 can be transmitted, the host device 41 determines that the current consumption of the device 31 can be supplied and issues a start request command. As a result, the MPU 33 shifts to step 44 to start the process of the device 31, and ends the process. Depending on the starting process of the device 31, the device 31 may perform an action of writing data or reading data with a reduced current consumption (current that the host device 41 can supply). The apparatus 31 of the fourth embodiment of the present invention has the following advantages.  1) (1) When the current consumption value of the device 31 exceeds the supply capacity of the host device 41, the current consumption of the device 31 can be reduced in accordance with the capability of the host device 41. In this way, the performance (write or read speed) of the host device 31 can be made to be maximized by the current supply of the host device 41. (2) A fifth embodiment in which the present invention is embodied will be described based on the drawings. Fig. 15 is a schematic block diagram of the host device 51 of the fifth embodiment. The host device (specifically, a personal computer) 51 includes an MPU 52, a memory 53, a main controller 54, a current supply circuit 55, and a display 56. The host device 51 is connected to the MPU 52, the memory 53, the main controller 54, the current supply circuit 55, and the display 56 via the internal bus bar 57, and transmits and receives data to each other. Further, the host device 51 is provided with first to tenth communication ports P1 to P10 for connecting USB devices. The MPU 52, which is a control circuit, executes various processes in accordance with the program stored in the memory 53 and collectively controls the host device 51. The program stored in the memory 53 includes a communication path 31 1277888 that controls the main controller 54 or the current supply circuit 55, and a device that connects each device of each of the communication ports P1 to P1 in the form of a GUI (GmphiC User lmerface). The information is displayed on the display program of the display 56. The main control H54 is a communication circuit based on the USB specification, and the control 5 is connected to the communication between the devices of each communication port 1"1~1"10. The main controller 54 is provided with a register 54a which can store machine information of devices connected to the respective communication ports ρ to P10. Specifically, when the device is connected to the communication ports P1 to P10, the host device 51 identifies the connection protocol and agrees between the devices, and stores the machine information obtained in this manner in the register 54a. The current supply circuit 55 supplies the maximum current consumption included in the machine information of the register 54a to the device connected to the communication port. Further, a limiter 58 is provided in the middle of the current passing path of each of the communication ports pi to P1 of the connection current supply circuit 55. The limiter 58 is a current monitoring circuit including a switching circuit. When an overcurrent of a predetermined current or more is flown, the switch is turned off and the current is passed through the path. The MPU 52 reads the machine information stored in the register 54a of the main controller 54 by executing the application (display program), and displays the status window on the display device 56. Specifically, as shown in Fig. 16, a plurality of devices 61 to 67 are connected to the main device 51, and the state window W1 shown in Fig. 1 is displayed on the display 56. That is, the first communication port 61 to which the mouse keyboard 61 is attached is connected to the second communication port p2, and the hard disk 63 is connected to the third communication port P3. Further, the optical disk 64 is connected to the fourth communication port p4, and the scanner is connected to the fifth communication port P5. Moreover, the digital camera PSC) 66, 67 is connected to the eighth communication port 32 1277888 P8 and the ninth communication port P9. The keyboard 61, the printer 62, the hard disk 63, the optical disk 64, the scanner 65, and the DSCs 66 and 67 are USB devices having a USB function (USB communication function), which are respectively connected to the host device 51 by the USB cable C1. Communication 埠. Further, in the fifth embodiment, the printer 62 is not a power supply bus via USB, but is a device that operates by power supply of a separately provided power cable (not shown). Other devices are hard disk devices that operate by USB bus power. As shown in Fig. 17, the status window W1 displayed on the display 56 is provided with a selection device, a port number, a device name, a manufacturer, a current consumption (mA), and a status bar. The device name, manufacturer, and current consumption are displayed in each communication port based on the machine information stored in the register 54a of the main controller 54. Further, the current consumption column displays the current consumption value (required value) of the device requiring the host device 51 and the current value (current value) of the 15 current point supplied from the host device 51 by the USB cable C1. The required value for each of the 5 is 100 mA on the keyboard 61, 100 mA on the printer 62, 500 mA on the hard disk 63, 500 mA on the optical disk 64, 300 mA on the scanner 65, 200 mA on the DSC66, and 250 mA on the DSC67. A selector button is provided in the selector bar for switching any device connected to each communication port to any of the 20-on state or the off state (used state or unused state). Each of the communication ports ρι to ρ5, P8, and P9 to which the devices 61 to 67 are connected may select one of the buttons to be turned on or off. Here, the first to fourth communication ports P1 to P4 and the ninth communication port P9 can select an ON button, and the fifth communication port P5 and the eighth communication port P8 can select a close button. 33 1277888 Once the ON buttons of the ports 1p1 to P4 and P9 are selected, the current consumption required by the devices 61 to 64, 67 is supplied from the current supply circuit 55, and the USB function of the device is activated. Therefore, the status bar forms "Acdve". However, the printer 62 is not powered by the busbar and is powered by its own power supply. Therefore, the "Active" status is displayed in blue. Since other devices operate in the power supply of the bus, the "Active" status is displayed in red. The current drain is displayed at the same current value as the required value. On the other hand, when the close button of the communication ports P5 and P8 is selected, the current consumption required by the devices 65 and 66 is not supplied from the current supply circuit 55, and the USB functions of the devices 65 and 66 are stopped (inactivated). . Therefore, the status bar shows "suspend" and the current value of the current consumption shows 2. 5mA. Further, regarding the unused communication ports P6, P7, and P10, 0 mA is displayed for the required value and current value of the current consumption, and "Not Use" is displayed in the status column. Further, below the state window W1, there is provided a display field for displaying the total consumption current and the use current and the allowable current and the margin current. In this case, the current consumption is required to total the current required for all the communication ports, and the current system is used to total the current value of all the current values. Further, the maximum current that can be output by the current-system current supply circuit 55 is allowed, and the residual current is subtracted from the allowable current by the current after the current is used. 20 The above specific example requires a current consumption of 1950 mA and a current of 1455 mA. Further, the allowable current is 2500 mA, and the margin current is 1045 mA. Therefore, even if the ON button of the fifth communication port P5 and the eighth communication port P8 is selected, and the current of the required value is supplied to the scanner 65 and the DSC 66 connected to the respective communication ports P5 and P8, since the current used is 1950 mA, Therefore, 34 1277888 will not exceed 250 mA. In this case, the scanner % and 耽 can operate normally. In contrast to the case where the device having the maximum current consumption of 500 mA is connected to the unused communication ports 6p6, p7, pl() of the host device 51 and operated, 5 exceeds the allowable current of the host device 51. In this case, the operation of the newly connected e will make the operation of the connected device unstable. The fifth embodiment is as shown in Fig. 18. When the novel device (hard disk 7b 72, Hub73) is connected to the communication device 埠p6, p7, pi〇 of the host device, the devices are not immediately made operable. First, 1 mA busbar power supply is allowed and only 10 U signals are transmitted. The domain device 51 displays the state window W2 as shown in Fig. 19 in accordance with the machine information obtained by the transmission of the information. That is, the device name, the manufacturer, the current consumption, and the state are displayed in the communication ports P6, P7, and P10. The required value of the hard disk 71, 72, and Hub73 newly connected to each of the communication ports ρ6, ρ7, and ρι〇 is 5 mA, and the current value is 1 mA. Each communication port 15 P6, P7, P1G selector block is not selected regardless of the open button or the close button and the USB function is in standby, so the status bar displays r Waitj 〇 again, in the status window W2, the required current consumption is 345 mA, the current is 1755 mA. Moreover, the allowable current is 25 mA, and the margin current is 745 mA. After operating the keyboard 61 mouse and selecting the disc 64 that is not immediately used, and the DSC67 close button, the newly connected hard disk, π and Hub73 are selected. Turn on the button. As a result, as shown in Fig. 20, the status window W3 is displayed on the display %. The status window W3 is compared to the status window W2 of Fig. 19, the current value of the fourth communication port P4 (disc 64) and the ninth communication port P9 (DSC67) is changed to 25 mA, and the status 35 Ϊ277888 display is changed to "suspend". Further, the current values of the sixth communication port P6 (hard disk 71), the seventh communication port P7 (hard disk 72), and the tenth communication port P10 (Hub73) are changed to 500 mA, and the status display is changed to "Active". In addition, Hub73 is not a device that is powered by a bus and operates with its own power supply. The status of "Active" is displayed in blue. In this case, the current is 2210 mA, and the allowable current of 2500 mA ensures a CU current of 290 mA. Thus, the host device 51 is connected to recognize new devices (hard disks 71, 72 and Hub 73) so that the devices 71 to 73 can operate normally. 0. The processing for displaying the status window "1 to ^¥3 among the processing executed by the mpu 52 of the fifth embodiment will be described based on the flow of Fig. 21. The processing of Fig. 21 is performed at the start of the host device After the initialization process of the execution ends, the MPU 52 obtains the machine information of each device from the register 5 of the host device 54, and then proceeds to step 520 to view the status window W1 (in response to the machine information). Referring to Fig. 17), it is displayed on the display 56. In step 530', the MPU 52 determines whether or not the novel device is connected to the unused communication port, or the so-called device connection state change from the connected communication port is judged as having In the case of a change, the MpU 52 moves to the step 54 and performs 2〇;::::;::^, the request is issued, and the new controller is stored in the temporary storage from the main controller 54 to thereby request the instruction from The machine information returned by the device: =. In addition, the connected device removes the machine information about the device from the predetermined communication device 54a. 36 1277888 In step 550, the MPU 52 is based on the updated machine information. The status window is displayed. Then, in step 55, the MPU 52 displays the status window based on the updated machine information. Then in step 560, the MPU 52 determines the button displayed on the selector bar of the status window by the operator (user) mouse operation. If it has been selected by 5, if there is no button selection, the process returns to step 530. Further, the MPU 52 determines that the process of steps 540 and 55〇 is not executed in the case where the step of the inorganic device connection state is changed, and the process proceeds to step 55. As described above, in the case where the operator does not connect the new device to the host device 51 and does not select the button of the selector window of the status window W1, the processing of steps 10 530 and 540 is repeated. Therefore, the display 56 is formed. The status window wi displayed in step 520 is continuously displayed. Further, as shown in Fig. 18, the operator sequentially connects the hard disks 71, 72, and Hub 73 to each of the communication ports P6, P7, and Pi, and repeats the three steps. The processing of 53 〇 560 560, the result is displayed on the display 56 in the status window 15 W2 of Fig. 19. If the operator selects the selector block button in the status window W2, the MPU 52 is from (four) 56 〇 _ to (4) (4) The hidden (four) communication 埠 changes the current supplied from the current supply circuit 55. Thereafter, ^1>1; 52 shifts to step 580 to display the status window corresponding to the operator's button selection after the display 2 switch 56. Returning to the processing of step 530. In step 58, the status bar is changed in response to the button selection and the calculation of the current consumption (calculation of the use current and the margin current) is performed. Specifically, a, the fourth communication port 4p4 is selected in the status window W2. The 9th communication 璋 P9 is closed _ city, in turn, the _κ4ρ6, the seventh communication object 37 1277888 and the 10th communication 埠 P10 open button. In this case, the processing of steps 560 to 580 is repeated at the time of button selection, and a total of the status window W3 of the second figure is displayed on the display. Although the above description is omitted, the flow of the overcurrent can be displayed in the status window ▽1~^ when the limiter 58 functions as an overcurrent that exceeds the maximum current consumption of each device. ¥3 and warned the operator. Specifically, the status of the status windows W1 to W3 displays "Warning" for alerting the warning, or displays the current value of the overcurrent in a different color from the normal value. 10 When the USB device is connected to the Hub73 connected to the 10th communication port of the host device 51, the status window of the Hub 73 can also be displayed. Specifically, in the case where the plurality of devices 81 to 83 are connected to the Hub 73, which is a relay device, as shown in Fig. 23, the status window W11 shown in Fig. 23 is displayed on the display 56 of the host device 51. That is, the first to the first communication ports P11 to P20 for connecting the USB 15 device are set in the Hub 73, and the first communication port P11 is connected to the optical disk 81, the second communication port P12 is connected to the hard disk 82, and the fourth communication is connected to the DSC 83.埠P14. Further, in the state window W11 of Fig. 23, the first and second communication ports P11 and P12 select the open button 'the fourth communication port 淳 selects the close button. Therefore, each of the required current values (= 100 mA) is supplied to the optical disk 81 and the hard disk 82 from the current supply circuit of the Hub 73 20 (the power supply 1C not shown). Further, the Hub73 is a self-powered machine (Self powered Hub), and the current (allowable current) that can be output from the current supply circuit is 500 mA. That is, the Hub73 can supply the maximum current of 500 mA defined by the USB specification to 38 1277888 to all the communication ports P11 to P20. Therefore, the Hub 73 does not have to control the supply current to each device, and the status window W11 displays the use status or the unused status of each device for informing the operator to connect to the Hub 73. Also, as shown in Fig. 24, the Hub 84 can also be connected to the communication of the Hub 73 5 埠 P13. In this case, not only the status window W12' of the Hub 73 shown in Fig. 25 but also the status window (not shown) of the Hub 84 is displayed on the display 56 of the host device 51. Further, in the case of displaying the plural status window, the respective windows are displayed in a pop-up form or a scroll form. Of course, it is also possible to connect any communication port of the host device 51 10 to the Hub operated by the bus. Figure 26 shows that it operates with busbar power.

Hub (Bus Powered Hub) 85. In Hub85, the first communication port P11 is connected to the optical disk 81, the second communication port P12 is connected to the hard disk 82, and the fourth communication port P14 is connected to the DSC83. The status window W13 of the Hub 85 as shown in Fig. 27 is displayed on the display 56 of the host device 51. In this case, since the allowable current of the Hub85 is as small as 15 400 mA, the display window W13 allows the operator to select the necessary equipment so as not to exceed the allowable current. The host device 51 of the fifth embodiment of the present invention has the following advantages. (1) The display 56 of the host device 51 displays machine information indicating the devices 61 to 67, 71 to 73 to which the communication beacons P1 to P10 are connected. The status windows W1 2〇 to W3 display not only the machine information (device name, manufacturer, current consumption) acquired from each of the devices 61 to 67, 71 to 73, but also display for the operator to select the device to be used or Unselected status selection buttons (on button and off button). When the operator confirming the status windows W1 to W3 selects the button, the supply current to each device is controlled in accordance with the selection result. For example, in the case of 39 1277888, it is possible to select whether or not to use the devices 61 to 67, 71 to 73 connected to the host device 51 without plugging and unplugging the USB cable C1. X, according to the state windows W1 to W3, it is possible to confirm the use state of each device at that point in time. In the conventional technology, when the number of communication devices of the host device is increased, it is necessary to increase the current supply capability of the current supply circuit with the addition of the communication port, which causes a problem that the circuit scale becomes large. On the other hand, in the fifth embodiment, the current supply capability of the current supply circuit 55 can be used to manage the supply current to the devices 61 to 67 and 71 to 73. Therefore, the circuit scale can be suppressed and the number of turns can be increased. 1〇(2) Since the display screen of the display unit 56 (the side surfaces of the status windows W1 to W3 and W11 to W13) is displayed in the form of a GUI, it can be easily selected and displayed in each of the status windows W1 to W3 by the mouse operation. , wu~ (four) selection button. (3) In the state windows W1 to W3, the allowable b current that can be supplied from the host device 51 and the used current supplied from the host device 51 to each of the devices 61 to 67, 71 to 73 and the margin after subtracting the used current from the allowable current are displayed. Current. In this case, the operator can confirm the margin current so that it does not exceed the capability of the host device, and can select the unnecessary device to turn off and select the necessary device's on button. (4) The state windows WH to W13 of the communication device 连接ρι〇 connected to the host device 51 and the state windows wi to w13 of the host device 51 are displayed separately. In this case, it is possible to confirm the state of the lions 73 and 85 by the operator, i) W11 to W13, and manage the supply currents of the devices 81 to 84 connected to the dirty portions 73 and 85. 40 1277888 (5) In the host device 51, since the limiter 85 is provided in the middle of the current passing path provided by the connection current supply circuit 55 and each of the communication ports P1 to P10, it is possible to prevent the system from being unstable. The sixth embodiment in which the present invention is embodied will be described below. Fig. 29 is a schematic block circuit diagram of a host device 51a according to a sixth embodiment of the present invention. The configuration of the host device 51a of the sixth embodiment is the same as that of the host device 51 of the fifth embodiment. As shown in Fig. 29, the host device 5 la has a plurality of ports §fl埠P1 to P10' and the USB devices D1 to D10 are connected to the ports 10 P1 to P10, respectively. The devices D1 to D9 have substantially the same electrical conductivity (USB function, required value) as the devices of the fifth embodiment of the devices 61 to 65, 71, 72, 66, and 67. Device D10 is a compact disc with a required value of 500 mA. The device (e.g., device D1) or device name (e.g., key 15 disk D1) is suitably used in the following description. The control circuit, i.e., the MPU 52, performs various processes in accordance with the program stored in the memory 53 and collectively controls the host device 51a. The programs stored in the memory 53 include communication programs and display programs and current control programs and applications. The communication program controls the mode of the main controller 54 or the current supply circuit 55. The display program is a program for displaying the device information of each of the devices D1 to D10 connected to each of the communication ports P1 to P1 on the display 56 by a GUI (Graphic User Interface). The current control program controls a program for supplying currents to the devices D1 to D10 connected to the respective communication ports ρι to ρι. The application is used to calculate tables, articles, image processing, etc. 20 1277888, MPU53 will use the above devices in the execution of the application. For example, when executing an application for calculating a table, the MPU 53 reads out the data used for calculation from the hard disk D3 (D6, D), and prints the data on the printer D2. According to the above application, the application is private. In the case where the USB devices D1 to D10 connected to the respective communication ports P1 to P10 are used exclusively, the MPU 52 changes the operational state of the devices. The MPU 52 changes the operational state when the device to be used is in an inactive state. The functional device has a device driven by a bus bar and a device with its own driving capability. The USB function of the device driven by the bus bar and the device provided by the system are operated by the current supplied by the USB cable C1. The device is activated by an external power supply, and the USB function is operated by the current supplied by the USB power or its current and the external power supply. Further, the device of the non-activated state (suspend) supplies the USB function. The minimum communication of the host device 51a (device reset or receiving data signal No. 15) current (2.5 mA in the fifth embodiment). The activation status (Active) device responds to the communication speed. Gives the device all the currents that can be operated (requires current). Therefore, the MPU52 activates the USB function of the device to be used, that is, changes the state of the status window to "Active" to supply the required current. At this time, when the total current consumption value of all the devices connected according to the activation of the device exceeds the allowable current value of the host device 51a, it is necessary for the MPU 52 to inactivate a part of the devices in the activated state to consume the total current. The value does not exceed the allowable current value. Therefore, the MPU 52 displays the status window on the display 56 and requires the operation 42 1277888 to be 100 mA. Therefore, even if the current of the required value is supplied to the printer d2, the tolerance of the host device 51a is exceeded. The current, therefore, the operation of the device in operation may be unstable. Thus, the MPU 52 displays the status window W12 on the display 56 and requires the operator of the 5 operation host device 5 to determine whether or not to use each device. The operator pays attention to the status window W12. The allowable current is displayed and selected in the state of the mouse operating the keyboard 01 is not used in this process. The result of the close button 0 in the scanner D5 is as shown in Fig. 33, the status window W13 is displayed on the display 1056. The status window W13 compares the status window W12 of Fig. 32, and the fifth communication port P5 (scanner D5) The current value is changed to 2.5 mA, and the status display is changed to "suspend". The current value of the second communication port P2 (printer D2) is changed to 100 mA, and the status display is changed to "Active". Machine D2 is a machine that operates from a power supply that is not connected to the bus, and the "15" color indicates the "Active" status. The current used is 2210 mA, and the residual current is 290 mA with respect to the allowable current of 2500 mA. Therefore, the host device 51a performs a printing process such as a transmission command to the printer D2. After the printing process is finished, the MPU 52 returns to the status window W12. 2. The host device 51a of the sixth embodiment of the present invention has the following advantages. (1) When the host device 51a executes the application program, when the connected plurality of devices D1 to D10 are used, the amount of current required for the device is supplied when the device to be used is in a stopped state. At this time, it is judged that the plurality of communication ports pi pi pi 具有 of the 1277888 device 51 supplied with the required amount are connected to the devices D1 to D10, respectively. The memory 53 stores the function execution flag 53c. As shown in Fig. 36, the borrowing function flag 53c is used to associate the operation states of the devices connected to the communication ports 5 P1 to P10 of the host device 51b with each of the communication ports P1 to P10. In the device display operation indicating "Active" in the figure, the device indicating "Wait" indicates that the device is stopped. Since the USB function is also in operation during the operation, the current of the required value is supplied from the host device 51b. The device that is stopped includes the USB function as Active (Active), and the USB function is Suspend. That is, the device in the stop includes a device that supplies the current of the required value, and a device that is supplied with a small amount of current (e.g., 25 mA) in the operation mode (suspension mode). Similarly to the sixth embodiment, the MPU 52 activates the device by using an apparatus that is in an inactive state by executing an application or the like. When the total current consumption value of all the devices connected to the activation of the device exceeds the allowable current value of the host device 51a, the MPU 52 activates a plurality of devices in an activated state so that the total current consumption value does not exceed the allowable current value. . At this time, the MPU 52 determines the device to be deactivated based on the information (state of the device) 20 displayed on the status window and the function flag 53c. In detail, the MPU 52 retrieves the device in the stop state from the function execution flag 53c. Next, the MPU 52 searches the device in the stopped state according to the status window to activate the device in which the USB function is activated, that is, supplies the required value current. The MPU 52 reduces the amount of current to be supplied by changing the USB function of the device supplying the required value current to the stop state. Therefore, the device to be used is automatically activated as the program such as the application is executed, and if the current supplied to the device by the host device 51 exceeds the allowable current by the activation, the device that is not used at this time will It is automatically changed to the stop state by 5 to ensure the residual current. Therefore, not only does it take time to activate the equipment, but it also prevents the overall operation of the system from being unstable. Further, in the case where there are a plurality of devices in the stopped state and the USB function is activated, the MPU 52 changes all the devices in which it exists to 10 "suspend". Thereby, the margin current is surely secured and the processing is started for the device to be used in a short time. The reason for changing all the devices in the stopped state to "suspend" is that even if some devices in a plurality of devices are changed to "suspend", the margin current value does not exceed the required current consumption value of the device to be used. In this case, the device must be changed to 15 "suspend"' so the processing will be delayed later. Once the scheduled operation is completed, the MPU 52 changes the used device to the ground state. The end of the operation of the device is performed by the host device 51 interrogating the device. In detail, the MPU 52 issues a request at a predetermined interval by the main controller 54 to confirm the operation status to the device, and the device transmits an answer command as a response. The MPU 52 confirms the operational status of the device based on the received answer command. The seventh embodiment has an automatic power-down state, a command end state, and a functional state in operation. Also, it may include other operational states. The request command issued by the device and the answer command sent by the device are based on the 49 1277888 case, and the MPU 52 retrieves the non-executing device according to the function execution flag in step 780. Second, MPU 52 deactivates the non-executing device in step 790. That is, the state of the device not used by the host device 51b is changed to "suspend" to secure the margin current. The MPU 52 changes the state of the device to be used to "Active" in step 800, and proceeds to step 740. The host device 51b of the seventh embodiment of the present invention has the following advantages. (1) The host device 51b has a machine flag 5c capable of executing the flag 53c by giving the operation state of the devices connected to the communication ports P1 to P10 to the corresponding communication ports P1 to P10. The host device 51b activates the inactive device by executing an application or the like, whereby when the total consumed current value of all connected devices exceeds the allowable current value of the host device 51a, the flag 53c is executed according to the function. Some of the devices in the activated device are deactivated such that the total current consumption value does not exceed the allowable current value. In this case, the device to be used is automatically activated as the program is executed, and the device that is not used at this time when the current supplied from the host device 51 to the device exceeds the allowable current with the activation. It is automatically changed to the stop state to ensure the residual current. Therefore, it is possible to prevent the operation of the entire system from being unstable without not only consuming the man-hours for activating the device. 20 Hereinafter, an eighth embodiment of the present invention will be described. In the eighth embodiment, the configuration of the host device is the same as that of the seventh embodiment shown in Fig. 34. The host device 51b of the eighth embodiment has the function of changing the function execution flag of the device being stopped to OFF, and the function of the USB function of the device whose function flag is OFF is activated, that is, the state is changed to 51 l277888" The function of suspend". Therefore, the function execution flag of the device that ends the operation is set to 〇FF. Moreover, the USB function of the device is deactivated, so that the current supplied from the host device 51b is reduced. In the same manner as the seventh embodiment, the host device 51b of the eighth embodiment can activate the device when the device in an inactive state is used to execute an application or the like. At this time, the device that has finished operating as described above is activated, and a minimum current (for example, 2.5 mA) for communication (device reset or reception of a data signal) is supplied. That is, no unnecessary current is supplied to the equipment that is not used. Therefore, in most cases, the current usage current of the host device 51b is smaller than the allowable current amount, and has a sufficient required current amount. The host device 51b activates the USB function of the device to be used. That is, the state of the status window is changed to "Active" and the required current is supplied. On the other hand, when the total current consumption value of all the connected devices exceeds the allowable current value due to the activation of the device, it is necessary to activate a plurality of devices to secure the amount of current to be supplied. However, the device that ends the above operation is activated and supplies only the current that can perform the minimum communication. Therefore, the host device 51b cannot ensure the amount of supply current by deactivating the device as in the seventh embodiment. In this manner, the host device 51b displays the status window on the display device, that is, the display unit 56, to notify the operator of the supply status of the current. Moreover, the host device

Mb displays the warning window on the display 56 and requests the operator of the operation host device 51 to judge the processing to continue or the like. As shown in Fig. 39, the warning message W21 is displayed in the warning window W21 and the plural number 52 1277888 (three in the 39th figure). In the present embodiment, the first item is an item that stops the current operation, the second item is an operation other than the stop of the third item, and the third item is an item waiting for sufficient power. The operator operates the mouse of the keyboard 61 to select one of the three items. When the operator selects the first item, the host device 51b stops the action that is currently to be performed. For example, in the case of printing using the printer 62 in accordance with a program such as executing an application, the operation of the printer 62 is stopped, that is, the printing process is stopped. When the operator selects the second item, the operator further operates the mouse of the key 10 of the key 10 and pays attention to the display of the allowable current in the status window to stop the operation and select the selector of the communication device to which the device is connected (〇N/〇 FF). The host device 51b reduces the amount of current supplied to the selected communication port to deactivate the USB function of the device connected to the communication port. Thereby, in order to supply the current required by the device to be used according to the operation of the time, it is possible to ensure a surplus current of 1 in 5 minutes, and the host device 5lb supplies a required amount of current to the device to be used, and the device is USB. The function is activated. In the case where the operator selects the third item, the host device 51b waits until the power is sufficient, that is, waits for the stop of the other device. The device whose status flag is in the ON state is set to 2〇 OFF according to the end of its operation, and the USB function is deactivated. Thereby, the amount of current supplied from the host device 51b to the device is reduced by the inactivation, and the amount of surplus current is increased. Therefore, the host device 51b stops the device other than the device to be activated and deactivates it, and waits until the margin current is larger than the required value of the device to be activated. 0 53 1277888 At this time, the host device 51b is The predetermined time compares the amount of surplus current with the required value of the device to be activated, and waits for the case where the margin current is larger than the required value. When the amount of surplus current is larger than the required value, the host device 5ib supplies a required amount of current to the device to be used to activate the USB function 5 of the device. Figures 37 and 38 show flow charts of device control processing when a program such as an application is executed. The MPU 52 first compares the margin current value with the required value of the device to be used in step 810 to determine whether current can be supplied to the device. 10 When it is judged that the current can be supplied (the margin current value - the required value), the MPU 52 stores the information stored in the third area of the memory 53 in step 820, and changes the state of the device to be used to rActive. Next, the MpU 52 changes the function execution flag to 365 in step 830. The Mpu 52 supplies the required value current to the device to be used in step 84. After 15, the MPU 52 performs processing of the device. The required value current is supplied from the host device 51b to activate the USB function of the device, and the data transmitted from the host device 5ib in accordance with the processing is responded to and operated. Once this action is completed, the function execution flag of the device in question is changed to 〇1^, and the USB function of the device whose function flag is OFF is set to be inactive. Since the process of deactivating the device is performed regardless of the program to be executed by the host device 51b, the host device does not have to wait for the processing executed by the device to end, and can perform the next processing. In the case where it is judged in step 8ig that the current cannot be supplied, 2 in step 850, the warning window (4) is displayed in the step display state 54 1277888. The window MPU 52 is in step 87. The operator waits for the input of at least one of the warning window 视窗 window. This is because the warning window W21 of the eighth embodiment has an item (second item) as an input state window. Therefore, the processing and order of these steps 850 5 470 can be appropriately changed. For example, a warning window is displayed, waiting for the input to the window, and the status window is displayed as necessary. Next, in step 880, the MPU 52 determines whether the input in step 87 is "stop operation". If it is "stop operation", the processing of this step is ended. For example, in the case of performing printing in an execution application, the printer w is used (refer to Fig. 2^9). In the case where the printer 62 does not have sufficient margin current and the operation is stopped in the step, the MPU 52 interrupts the use of the printer & and resumes execution of the application. In the case where it is judged in step 880 that the operation is not "stopped", the Mpu 52 determines in step 890 whether the action in the status window has stopped. As for the stop, it is judged by the switch of the switch. That is, the MPU 52 judges whether or not the button displayed in the status screen has been switched, and in the case of switching, shifts to step 820 shown in Fig. 37 and executes the subsequent processing. Further, in the case where the selector button has been switched, it is judged that the power can be supplied, or the configuration can be shifted to step 810. 20 In step 89, the input does not perform the stop operation in the status window. That is, in the eighth embodiment, when "waiting until the power is sufficient" is selected, the Mpu 52 waits until the power can be supplied. That is, the MPU 52 waits for a predetermined elapsed time in step 90 and determines whether or not power is available in accordance with the amount of margin current in step 910. In the case where power cannot be supplied, the MPU 52 shifts to step 9〇〇. ^ , 55 1277888 repeatedly performs steps 900 and 9i and waits for power to be supplied. When it is determined in step 910 that the power can be supplied, the MpU 52 shifts to the step 820 shown in the figure to perform the subsequent processing. The host device 5A of the eighth embodiment of the present invention has the following advantages. The host device 51b changes the function execution flag of the device in the stop to off, and deactivates the USB function of the device whose function is flagged as 〇FF. In this case, the function execution flag of the device that ends the operation It is set to OFF, and the USB function of the device can be deactivated. Therefore, the current supplied from the host device 51b can be reduced by one to reduce the current consumption value. (2) The host device 5 lb displays the status window at The display device 56, which is the display device, notifies the operator of the supply status of the current. Further, the host device 51 displays "Mouth View®" on the display 56 and requests the operator of the operation host device 51 to continue processing or the like. In the case where the operator chooses to continue processing, the host device 51b stands by until the current can be supplied, so that the processing can be continued without labor. In the case where the operator selects the abort processing, since the processing of using the device is interrupted, other processing can be performed. The above embodiment can be modified as follows. In the first embodiment, the host device U is described as the maximum current consumption domain of the configuration descriptor in order to interrogate the change of the supply current of each device 21 ° 23 , but is not limited thereto. The category for descriptors other than the configuration descriptor, the novel descriptor or the category are not used, and the novelty is used to change the supply current. In the first embodiment, the control circuit mMPU 52 executes the second figure 56 1277888, but the main controller 14 can also be provided with a control unit for executing the processing of Fig. 2. Further, in the second to fourth embodiments, the MPU 52 also performs the processes of the first, third, and fourteenth embodiments, but the control unit provided in the USB controller 35 may be configured to execute such processes. In this way, it is possible to reduce the processing load of the MPUs 12 and 33, and it is practically good. The device 31 of Fig. 9 can also be provided with a level switch for switching the current consumption of the internal circuit (a switch for setting the speed at which data is read or written). In this case, similarly to the third embodiment, the current consumption to be stored in the register 36a is changed in accordance with the set value of the level switch. After the change, the switch 10 of the switch unit 42 is operated to temporarily set the device 31. In the cut state. Even so, the device 31 can be operated with a suitable supply current in response to the set value of the level switch. The switch unit 42 (see Fig. 1) in the second to fourth embodiments may be replaced by the switch unit 42A shown in Fig. 28. That is, the switch unit 42A of Fig. 28 has a plurality of switching elements (M0S transistors) Tr Tr2, Tr3 to control the respective switching elements Tr1 to Tr3, and causes the host device 41 to recognize the cutting of the device 31. Specifically, the device 31 operating at Full Speed turns off the switching element Tr 1 by the control signal S1 from the MPU 33, and cuts off the boosting resistor ri of the signal line D+ to which the communication data is to be transmitted. Thereby, the signal lines d+, D- form a state of "SEO", so that the host device 41 can recognize that the device 31 20 has been disconnected. Further, the device 31 operating at High Speed turns off the switching elements Tr2, Tr3 by the control signals S2, S3 from the MPU 33, and causes the signal lines D+, D- to which the communication data is to be transmitted to be in a high impedance state. Thereby, the voltage level of the signal lines D + , D - exceeds the disconnection voltage value of the USB specification (for example, 625 mV), so that the host device 41 can recognize that the device 31 is turned off. 57 I277888 Stops the wheat. In this case, since the current supply system of the device in the stopped state is automatically stopped, the power consumption of the entire system can be reduced. In the seventh embodiment, the eighth embodiment can also constitute the device to notify the operating state every time the predetermined time interval 5 (automatic power down state, command end state, function operation). In this case, the host device does not need to issue a request instruction to the device. Therefore, the general processing of the host device can reduce the load and achieve high speed processing. In the eighth embodiment, the content 10 of the warning window W21 and the processing of this content can be appropriately changed. For example, when there is no surplus in the supply current of the device to be used, it is possible to display the purpose of waiting for the current to be supplied, and to display whether or not to wait for the display and to determine whether or not to interrupt the process. [A brief description of the male type] Fig. 1 is a schematic block diagram of a host device according to a third embodiment of the present invention. Figure 2 shows a flow diagram for the process of connecting to identify a novel device. Fig. 3 is a diagram showing an agreement between the host device and each device. Figure 4 is a diagram showing the agreement between the host device and each device. Fig. 5 is a diagram showing an agreement between the host device and each device. Fig. 6 is a diagram showing an agreement between the host device and each device. 59 1277888 Figure 7 shows an illustration of the agreement between the host device and each device. Fig. 8 is a diagram showing an agreement between the host device and each device. 5 Fig. 9 is a schematic block circuit diagram of an apparatus according to a second embodiment of the present invention. Figure 10 is a circuit diagram of the switching unit. Fig. 11 is a flow chart showing the connection identification processing of the second embodiment. Fig. 12 is a block circuit diagram showing a schematic 10 of the apparatus of the third embodiment of the present invention. Fig. 13 is a flow chart showing the connection identification processing of the third embodiment. Fig. 14 is a flow chart showing the connection recognition processing of the fourth embodiment of the present invention. Fig. 15 is a block diagram showing the outline of a host device according to a fifth embodiment of the present invention. Fig. 16 is a block circuit diagram showing the connection state of each device of the host device. Fig. 17 is an explanatory diagram showing a status window. Fig. 18 is a block diagram showing the connection state of each device of the host device. Fig. 19 is an explanatory diagram showing a status window. Fig. 20 is an explanatory diagram showing a status window. Figure 21 is a flow chart showing the processing of the status window. Fig. 22 is an explanatory diagram showing the connection state of each device of the Hub. 1277888 Figure 23 shows an illustration of the status window of the Hub. Fig. 24 is an explanatory diagram showing the connection state of each device of the Hub. Figure 25 shows an explanatory diagram of the status window of the Hub. Fig. 26 is an explanatory diagram showing the connection state of each device of the Hub. 5 Figure 27 shows an illustration of the status window of the Hub. Fig. 28 is a circuit diagram showing another example of the switching unit. Figure 29 is a schematic block circuit diagram of a host device relating to a sixth embodiment of the present invention. Fig. 30 is a flow chart showing the device control processing of the sixth embodiment. 10 Figure 31 shows an explanatory diagram of the status window. Fig. 32 is an explanatory view showing a status window. Figure 33 shows an explanatory diagram of the status window. Figure 34 is a schematic block circuit diagram of a host device in accordance with a seventh embodiment of the present invention. 15 Fig. 35 is a flow chart showing the device control processing of the seventh embodiment. Fig. 36 is an explanatory diagram showing the state of the function execution flag. Fig. 37 is a flow chart showing the device control processing of the eighth embodiment of the present invention. Fig. 38 is a flow chart showing the device control processing of the eighth embodiment. 20 Figure 39 shows an explanatory diagram of the warning window. Figure 40 shows a flow diagram for the process of connecting to identify a novel device. Figure 41 is an explanatory diagram for explaining the data transfer of USB. [Main component symbol description]

11 Host device 12MPU 1277888 13 Memory 42A Switch unit 14 Main controller 42a, 42b Switch circuit 14a Register Sa^ Sb Control signal 15 Current supply circuit D + , D - Signal line 16 Current monitoring circuit 43 Device 17 Internal bus 44 Controller PI~P3 Communication 埠45 Control Speaker 21~23 丨1st to 3rd Device 46 Position Switch Cl USB Cable 51 Host Device 25 Switch Circuit 51a Host Device 31 Device 51b Host Device 32 Disc 52 MPU 33 MPU 53 Memory Body 34 Memory 53c Flag 35 USB Controller 54 Main Controller 36 Power Controller 54a Register 36a Register 55 Current Supply Circuit 37 Device Controller 56 Display 38 Disc Rotation Motor 57 Internal Bus 39 Internal Confluence Row PI~P10 1st to 10th communication 埠PO USB communication 埠D1~DIO USB device Cl USB cable Pll~P20 1st to 10th communication 埠41 Host device 58 Limiter 42 Switch unit 61 Keyboard

62 1277888 62 Printer P11 63 Hard Disk P12 64 Disc 83 65 Scanner P14 66, 67 DSC 85 7 Bu 72 Hard Disk Trl· 73 Hub R1 W1~W3 Status Window 81 Disc 82 Hard Disk

1st communication 埠 2nd communication 埠 DSC 4th communication 限制 limiter

Tr3 switching element resistance 63

Claims (1)

r. 1277888 X. Patent Application Scope 竿 124 124 124539 Application/Case Application Patent Fan Yuanhuang Grip 1. A host device that supplies power to multiple device operators by means of a plurality of bus bars for serial communication. The utility model is characterized in that: a plurality of communication ports are used for connecting the plurality of devices; a communication circuit is connected to the plurality of communication ports and is taken from the plurality of devices by communication with the plurality of devices. The spear includes a plurality of machine information of the current consumption of the plurality of devices; a current supply circuit that connects the plurality of communication ports to supply the current 10 to the plurality of devices; and a control circuit that connects the communication circuit and the current Supplying the circuit, and when the total value of the current consumption of the device newly connected to the plurality of communication devices and the current consumption of the device connected to the identification device exceeds the current that can be supplied by the current supply circuit, the current supply circuit is supplied from the supply device 15 to the foregoing The supply current of a plurality of devices. 2. The host device of claim 1, wherein the control circuit changes the supply current to the newly connected device and the device whose connection identification is completed. 3. The host device of claim 1 or 2, wherein the communication circuit has a function of transmitting a current value that can be supplied from the current supply circuit to the plurality of devices. 4. The host device of claim 3, wherein the bus bar is a universal serial bus, and the communication circuit transmits the current value that can be supplied to the foregoing plurality by using an instruction based on the bus bar specification. Set 64 1277888 And receiving any one of the ACK packet and the STALL packet replied from each device, the control circuit determining whether the device is operable based on the packet received by the communication circuit, and changing the supply current to the operable device. 5 5· The main type of clothing; the clothing is powered by a plurality of bus bars for serial communication to enable the plurality of equipment operators, and is characterized by: a plurality of communication ports for connecting the foregoing plurality a communication circuit that connects the plurality of communications and obtains a plurality of machine information including current consumption of the plurality of devices by communication with the plurality of devices; the display device is connected to the communication circuit And displaying the plurality of machine information and the selection information for causing the operator to select a plurality of devices to connect the communication ports as the use state or the unused state; and 15 control circuit connecting the communication circuit and the display device, and The supply current of each device is controlled for each of the aforementioned communication ports in accordance with the consumption current of the plurality of devices and the selection result of the operator according to the selection information. A peripheral device that receives power from a host device by means of a bus bar for serial communication, and is characterized by comprising: an internal circuit including the bus bar for use with the host device a communication circuit for communicating, and transmitting the data according to the communication data sent by the communication circuit; and a control circuit connecting the internal circuit, and the current consumption of the internal circuit when the device is connected to the host device When the current can be supplied to the host device, the current consumption is reduced. 7. The peripheral device of claim 6 which further has a switch unit, wherein the switch unit is connected to the communication circuit, and temporarily cuts off the bus bar and the communication 5 circuit after the control circuit reduces current consumption. The linker. 8. The peripheral device of claim 6 or 7, wherein the busbar is a universal serial busbar, and the communication circuit consumes current of the internal circuit by using data communication based on a universal busbar serial specification. The value is transmitted to the host device, and the control circuit determines whether a request command for starting the device is issued from the 10 host device, and reduces the current consumption of the internal circuit when the request command is not issued. 9. The peripheral device of claim 6 or 7, wherein the busbar is a universal serial busbar, and the communication circuit consumes current of the internal circuit by using data communication based on a general busbar serial specification. The value 15 is sent to the host device, and the control circuit reduces the current consumption of the internal circuit by the current supplied when the current is notified from the host device. 10. The peripheral device of claim 6 or 7, further comprising a setting unit connected to the control circuit to set a current consumption value of the internal electric circuit 20, wherein the control circuit corresponds to a set value of the unit The current consumption of the aforementioned internal circuit is changed. 11. The peripheral device of claim 6 or 7, wherein a switching circuit is further provided, the switch circuit is connected to the control circuit, and when it is determined that the control circuit cannot reduce the current consumption of the internal circuit, the 66 is cut off from the foregoing A n I27788S year of repair (Yin Zheng replaces the current value of the supply current supplied by the busbar. 12. The control method of the communication system is from the host device by the complex bus for serial communication. A method for powering a plurality of devices to operate the plurality of devices, wherein the method includes: obtaining a step of acquiring, by the host device, device information including current consumption of each device from the plurality of devices; and changing steps, In this step, when the total value of the current consumption of the device newly connected to the host device and the current consumption of the device connected to the identification device exceeds the current that can be supplied by the host device, the host device pair 10 is changed by the current that can be supplied. The step of supplying the metering of the supply current of each device. 13. Control of the communication system The method is a method for operating a device by powering a device from a host device by using a bus for serial communication, and the method includes: 15 the device has an internal circuit, and the internal circuit includes The communication circuit for communicating by the host device is operated according to the communication data sent and received by the communication circuit, and the control method includes the step of reducing current consumption, wherein the step consumes current consumption consumed by the internal circuit exceeding the host device The step of reducing the current consumption of the internal circuit by the device in conjunction with the supplyable current when the current is supplied by 20. 14. A control method of the communication system is performed by a plurality of bus bars for performing serial communication. A method for powering a plurality of devices from a host device to operate the plurality of devices, characterized by comprising: 67 1277888 a step of obtaining, by the host device, machine information including current consumption of the plurality of devices from the plurality of devices; and a displaying step of displaying, by the display device disposed on the host device, machine information of each device a step for causing an operator to select selection information for each device as a use state or an unused state; and a control step based on the power consumption IL included in the machine information and an operator according to the selection information The selection result is a step of controlling the supply current to each of the aforementioned devices. 10: The control method of the communication system according to claim 14, wherein the display device displays a display screen corresponding to the GUI, and the displaying step includes a selection button for displaying the selection information on the display surface, wherein the controlling step includes The aforementioned selection, selected by the operator's mouse operation, controls the supply current to the aforementioned device. 15. The method for controlling a communication system according to Item 14 or 15 of the full-time application, wherein the displaying step comprises: displaying, by the display device, the amount of money that can be supplied by the host device, and the current used for supplying the device from the host device, The margin current after the current is used is subtracted from the aforementioned allowable current. 20 如·If you apply for the general information of the 14th or 15th item of the full-time circumstance, the above-mentioned multiple devices are connected to the complex communication device of the former fascinating master (4), and the relay device of the relay communication is connected to the above plural Any one of the communication ports 1 and the foregoing step of connecting the plurality of devices by the foregoing relay device includes displaying a status window for each device directly connected to each communication port in the foregoing display I And related borrowing 68 1277888 A status view of the machine information of each device connected by the aforementioned relay device. 18. The method of controlling a communication system according to claim 12, 13, 14 or 15 wherein each of said plurality of busbars is a universal serial busbar, 5 and said serial communication comprises a universal serial busbar specification Information communication as the basis. A host device is powered by a plurality of bus bars for performing serial communication to enable a plurality of device operators, and is characterized by: a plurality of communication ports for connecting the plurality of devices; a communication circuit that connects the plurality of communications and obtains a plurality of machine information including current consumption of the plurality of devices by communication with the plurality of devices; and a control circuit that connects the communication circuit by When the device that is not in use is changed to the use state and the increased consumption current 15 exceeds the current that can be supplied by the current supply circuit, the current is changed. The supply circuit supplies the amount of supply current to the connected plurality of devices. 20. The host device of claim 19, comprising a display device, wherein the display device can display the plurality of machine information and the plurality of materials for causing an operator to select each communication port to make a thief or not The use state selection information provider's and the aforementioned control circuit are connected to the display device, and the supply current of each device is controlled for each of the aforementioned communication ports according to the power consumption of the predecessor device - (4) the operator's selection result of the information. 21. The host device of claim 19 or 20, wherein the aforementioned control 69 The circuit of the 1277888 circuit can display the warning information, and the warning information includes information indicating that the current consumption exceeds the current supply circuit of the current supply circuit, and the device for selecting the unused state is changed to use. The selection information of the continuation or cessation of the processing of the state, and 5, when the continuation of the foregoing processing is selected, the standby until the current to the device can be supplied, and when the processing of the foregoing is stopped, the processing using the aforementioned device is interrupted. 22. The host device of claim 19, wherein the control circuit avoids the machine information before changing the current amount, and changes the current amount of the device to be used to a predetermined current amount. Respond to the aforementioned machine information. 23. The host device of claim 19 or 20, wherein the foregoing devices further indicate whether the function is in operation, and the control circuit reduces the supply to the non-transport according to the function execution flag. 15 The amount of current in the device under operation. 24. The host device of claim 23, wherein the function execution flag of the device that has finished operating is changed to a stop state. 25. The host device of claim 23, wherein the amount of current supplied to the device in which the flag is in a stopped state is reduced. The method for controlling a communication system is a method for operating a plurality of devices by powering a plurality of devices from a host device by using a plurality of bus bars for serial communication, wherein the method includes: obtaining steps, The step is the step of obtaining, by the host device, the machine information including the current consumption of the plurality of devices from the plurality of devices; 70 1277888 service 1 ? 8 f year month repair (#) is replacing the page 丨 determination step, the step is the aforementioned host a step of determining whether a current corresponding to a required value of the device in an unused state is available; and a changing step of changing a current supplied to the plurality of devices connected to the current supply circuit when the current cannot be supplied The steps of quantity. 27. The method of controlling a communication system according to claim 26, further comprising a display step of displaying a plurality of machine information displayed on the display device of the host device and for causing an operator to select to be connected to a step of selecting information by using a plurality of devices of each communication port as a use state or an unused state; and a control step of controlling the foregoing according to a current consumption value of the plurality of devices and a result of selection by an operator according to the selection information The step of supplying current for each communication port. 28. The method of controlling a communication system of claim 26 or 27, further comprising a display step of causing a display device provided on the host device to display a warning message, wherein the warning message includes when the current is consumed The information indicating the purpose of the current supply circuit when the current is supplied is greater than the information indicating the purpose of selecting the continuation or stop of the process of changing the device in the unused state to the use state, and the standby step is selected. In the case where the foregoing processing is continued, the standby step is a step of supplying current to the device 0, and the interrupting step is a step of interrupting the process of using the aforementioned device in the case where the aforementioned processing is stopped. 29. The control method of a communication system according to claim 26 or 27, wherein the control circuit performs a step of avoiding the aforementioned machine lean before changing the current amount, and executing a change in current amount of the device to be used 71 12778881 9VSi8 The step of returning the aforementioned machine information after the predetermined amount of current. 30. The method for controlling a communication system according to claim 26 or 27, wherein the foregoing device indicates whether the function is in operation or not, and the control circuit cuts the supply to the non-function according to the function execution flag. 5 The step of the amount of current in the device in operation. 31. A method of controlling a communication system as claimed in claim 30, which comprises the step of changing the function execution flag of the device that has finished operating to a stopped state. 32. The method of controlling a communication system of claim 30, wherein the package 10 includes the step of reducing the amount of current supplied to the device in which the function execution flag is stopped. 72