JP3647279B2 - Connection processing system and connection processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection processing system and a connection processing method for supplying power by performing connection processing from a main device to a downstream-side connected device connected via an interface (I / F).
[0002]
[Prior art]
As a method of forming a network, there is a method of forming a stair-like star topology network (hereinafter STN) as shown in FIG. When forming the STN, each signal line is connected between the management control device 1 and the hub 2, the hubs 2 and 3, and the connected devices 4, 5 and 6 in the main body device. In this case, there is only one management control device 1 on the STN for STN control.
[0003]
The hubs 2 and 3 having a signal repeater function are indispensable functions for forming an STN because they serve as connection points for connecting additional devices. Each connected device is physically connected to the management control device 1 via the hubs 2 and 3. However, since the hub functions as a repeater, it is ethically connected to the management control device 1 as shown in FIG. Same as directly connected. As each of the connected devices 4, 5, and 6, for example, a computer I / O such as a printer, a scanner, or a keyboard can be considered. In such a network system, power is not supplied to connected devices by supplying power via a cable forming the network. In the management of the power to be supplied, the management control device 1 reads the information unique to each connected device at the time of connection, and gives permission for connection by calculating necessary power.
[0004]
[Problems to be solved by the invention]
However, the conventional connection processing method as described above has the following problems.
[0005]
When reading the information at the time of connection of the connected device newly connected to the STN, if the calculated value exceeds the supply-side power consumption (allowable amount), the use of the connected device is not permitted because the power cannot be supplied. . Since the allowable amount of the original power supply that supplies power via the network cable is limited, the number of units is limited. Further, since the management control device 1 performs all the permission processes, it is impossible to determine the reason why the connected device is not permitted to connect.
[0006]
Conventionally, since this connection information is information unique to the connected device, the user needs to interrupt the use of the connected device or stop the use of another device.
[0007]
Also, it was difficult to understand why it was not connected.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a connection processing system and a connection processing method that improve the connection tolerance of a connected device.
[0009]
[Means for Solving the Problems]
The connection processing system and the connection processing method of the present invention are configured as follows.
[0010]
(1) A connection processing system that performs connection processing from a management control device to a connected device connected via an interface and supplies power, and performs communication between the management control device and the connected device. A communication unit, wherein the management control device performs a process of permitting a connection when a predetermined connection condition is satisfied from power consumption information of the connected device obtained by the communication unit, and connects the interface to the connected device. And when the connection is not permitted from the power usage information exceeding the allowable power supply of the management control device, the connected device uses the information to reduce the power usage. It changed and it communicated with the said management control apparatus again.
[0011]
(2) In the connection processing system according to (1), the management control device includes a detecting unit that detects an abnormal state of the connected device, and when the abnormality is detected, power supply to the connected device is stopped. I did it.
[0012]
(3) In the connection processing system according to the above (1) or (2), when the amount of power used for the connected device is reduced, control means for performing power distribution control in the connected device body according to the amount of power. Equipped with.
[0013]
(4) A connection processing method for supplying power by performing connection processing on a connected device connected to the management control device via an interface, wherein the management control device is obtained by communication means. A process of permitting connection when a predetermined connection condition is satisfied from the power usage information of the device is performed to supply power to the connected device via the interface, and from the power usage information, the management control device When the connection allowable power is not exceeded and the connection is not permitted, the connected device is changed to the information for reducing the used power and communicated to the management control device again.
[0014]
(5) In the connection processing method of (4) above, the management control device stops the power supply to the connected device when detecting the abnormality by the detecting means for detecting the abnormal state of the connected device. did.
[0015]
(6) In the connection processing method according to (4) or (5), when the connected device reduces the amount of power used, it performs power distribution control in the connected device body according to the amount of power. did.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, this embodiment will be described with reference to the drawings. The description of FIGS. 1 and 2 has been described above, and a description thereof will be omitted.
[0017]
FIG. 3 is a circuit block diagram showing the configuration of the management control device in the logically connected main body device shown in FIG. In the figure, reference numeral 11 denotes a network cable (interface) 11 for connecting the management control device 1 and the connected device 10, and a total of four power lines of signal lines Data (data) 1, Data 2, VBUS, and GND (ground). Consists of cables. VBUS is for power supply, and GND is VBUS or GND for data lines.
[0018]
All the ports in the downstream direction of the management control device 1 and the hubs 2 and 3 have pull-down resistors 12 and 13 on the signal lines of Data1 and Data2. As a result, when the connected device 10 is not connected to the downstream ports of the management control device 1 and the hubs 2 and 3, or when the power is not supplied to the pull-up resistor 14 of the connected connected device 10. Both of the signal lines Data1 and Data2 are pulled down to the ground level by the pull-down resistors 12 and 13 connected to the downstream side. This state is referred to as a disconnected state.
[0019]
Further, on the upstream side of all the connected devices 10, the signal line Data 1 is connected to the power supply circuit 15 via the FET 16 by the pull-up resistor 14, and the power is supplied to the connected device 10 and the signal line is stopped. When the signal line Data1 has the pull-up resistor 14, the signal line Data1 is at a certain level or higher, and the signal line Data2 is almost at the ground level. The state of these two signal lines is referred to as a connected state.
[0020]
In the connected device 10, the Data 1 signal is connected to the FET 16 through the pull-up resistor 14. Thus, when the signal line is at rest, the state of the signal line Data1 is changed by controlling the FET 16 on / off, and two types of cable states, that is, a disconnected state and a connected state can be generated in a pseudo manner.
[0021]
The detection circuit (abnormality detection means) 24 is a circuit that monitors the voltage levels of both the signals Data 1 and Data 2 from the transmission / reception circuit 22. The detection circuit 24 receives information from the control circuit 23 as to whether or not data transmission / reception is suspended from the transmission / reception circuit 22.
[0022]
The management control device 1 includes a management control device 1, a power supply circuit 25 that supplies power to the connected device 10, an FET 26 that can turn on / off the power supplied to the connected device 10, a transmission / reception circuit 22, a control circuit 23, and a detection circuit 24. , And pull-down resistors 12 and 13. The connected device 10 connected to the management control device 1 by the network cable 11 includes a power supply circuit 15, an FET 16, a control circuit 17 that performs main control, a transmission / reception circuit 18, a writable ROM 20, and a timer 19 that counts standby time. , A pull-up resistor 20 and a display circuit 21.
[0023]
The control circuit 17 performs main control of the connected device 10, and controls the connected device 10 by the transmission / reception circuit 18 according to the control of the management control device 1. In addition, the timer can be used to monitor when there is no request from the management control device 1 for a certain period of time. The control circuit 17 controls the signal attach for turning on / off the power supply of the pull-up resistor 14 connected to Data1. By this control, the connection state / disconnection state described above can be created.
[0024]
Processing in which the management control device 1 permits or prohibits connection with the connected device 10 is called connection processing. In this connection process, the detection circuit 24 of the management control device 1 constantly monitors the state of the two signal lines Data1 and Data2. At this time, the state of the two types of signals, the previous connected state and the disconnected state, is monitored, and when an activity occurs, the control circuit 23 is notified and the transmission / reception circuit 22 is connected to the downstream connected device. To start. The power supply circuit 25 is designed not only to operate the management control device 11 but also to supply power to a connected device that is supplied with power via a cable via a bus. Yes. However, an upper limit is set for the amount of power that can be supplied, and this information is notified to the control circuit 23 so that connection cannot be permitted for those that exceed this amount of power during the connection process.
[0025]
However, the power supply is always output so that the new connected device 10 may be connected at any time. The FET 26 functions as a switch so that the power supply can be stopped if the power supply connected device downstream is in an overcurrent or abnormal mode. The don signal is provided to turn on / off the FET and is operated by the power supply circuit 25 in accordance with an instruction from the control circuit 23.
[0026]
The connected device 10 waits for the connection processing to be started by the transmission / reception circuit 18 when power is supplied by the cable 11.
[0027]
The management control device 1 manages and controls the device information of the connected device 10 including information on the power used, with respect to the transmission / reception circuit 18, in order to connect to the connected device 10 when the activity of the previous detection circuit 24 occurs. Request device 1 to transmit. The connected device 10 has device information in the ROM 20, and returns default information to the management control device 1 after reset at power-on.
[0028]
The management control device 1 analyzes and controls the information included in the device information. However, when supplying power via a cable as in the connected device 10 that supplies power, the management control device itself It is necessary to manage so that the power does not exceed. At this time, when a device of the same power supply type is connected in addition to the connected device 10 and the capacity of the connected device 10 is added, the allowable amount of the management control device 1 may be exceeded. .
[0029]
In this case, connection of the last connected device 10 is prohibited. Thereby, the safety of the power supply circuit 25 is ensured.
[0030]
The connected device 10 turns off the FET 16 by the control circuit 17 assuming that the connection is not permitted when no periodic exchange is received from the management control device 1 for a certain time after transmitting the device information.
[0031]
As a result, a disconnected state occurs between the management control device 1 and the connected device 10.
[0032]
This disconnection process is terminated once when the disconnected state occurs.
[0033]
The connected device 10 prepares the next device information of the default value stored in the ROM 20 as the connection is not permitted. Also at this time, since the power is supplied via the FET 26 of the management control device 1, the connected device 10 can operate. This device information is information in which the power capacity is reduced because the power information is changed and the display circuit 21 is not used.
[0034]
When the FET 16 is turned on by the control circuit 17, Data1 and Data2 are connected again, and the detection circuit 24 detects activity again. From now on, only the device information is the same as the previous connection process.
[0035]
The management control device 1 again converts the total power by the control circuit 23 and permits or prohibits the connected device 10 according to the connection conditions.
[0036]
The ROM 20 of the connected device 10 stores device information over several stages up to the amount of power for operating the minimum function, and the above processing is repeated until the minimum power mode is reached. At that time, the control circuit (control means) 17 of the connected device 10 performs power distribution control in the connected device 10 according to the amount of power used.
[0037]
The connection process described above will be described with reference to the flowchart of FIG. FIG. 4 is a flowchart showing the connection processing operation of the embodiment. This processing operation is executed based on a program stored in the ROM 20 and a ROM (not shown) in the management control device 1 according to an instruction from a CPU (not shown) in the control circuits 17 and 23.
[0038]
First, in step S101, it is confirmed whether the connected device 10 is connected, and if connected, the process proceeds to step S102. Next, in step S102, the management control device 1 checks the device information transmitted from the connected device 10, and if the supply allowable power is not exceeded from the used power information in the device information, the process proceeds to step S104. A connection permission process is performed to supply power.
[0039]
If the allowable power supply is exceeded, the process proceeds to step S103. In step S <b> 103, the connected device 10 reads the device information whose power consumption has been reduced from the ROM 20 and transmits it again to the management control device 1.
[0040]
As described above, in this embodiment, in order to improve the connectivity, when the connection target device 10 is not permitted to connect in the connection permission process at the time of new connection, a new connection event is automatically generated on the management device 1 side. The connection information is read again and the total power amount on the management control device 1 side is reduced by announcing a power capacity smaller than the connection information that was not permitted last time at the time of reconnection. Device information can be automatically changed without insertion / extraction, and connection tolerance can be improved.
[0041]
【The invention's effect】
As described above, according to the present invention, in the connection processing system for supplying power by performing connection processing from the management control device to the connected device connected via the interface, the management control device and the connected device. A communication unit configured to communicate with a connection device, wherein the management control device performs a process of permitting a connection when a predetermined connection condition is satisfied from power usage information of the connected device obtained by the communication unit. When power is supplied to the connected device via the interface, and the connection is not permitted from the power usage information exceeding the allowable power supply of the management control device, the connected device uses the usage Since the information is changed to information with reduced power and communicated to the management control device again, the connection tolerance can be improved, and the connected device can be made more efficient. There is an effect that can be Ku use.
[0042]
In addition, the management control device is provided with detection means for detecting an abnormal state of the connected device, and when the abnormality is detected, the power supply to the connected device is stopped, which leads to improvement in safety. effective.
[0043]
In addition, since the connected device includes control means for performing power distribution control in the connected device main body according to the amount of power when the used power amount is reduced, the connected device can be used efficiently. There is an effect that can be done.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a network topology connection configuration of an embodiment. FIG. 2 is a block diagram showing a logical connection configuration of an embodiment. FIG. 3 is a circuit block diagram showing a configuration of a connection processing system of the invention. FIG. 4 is a flowchart showing the connection processing operation of one embodiment.
1 Management Control Device 2 Hub 3 Hub 4 Connected Device 5 Connected Device 6 Connected Device 10 Connected Device 11 Network Cable 15 Power Supply Circuit 16 FET
17 Control circuit (control means)
18 Transmission / reception circuit (communication means)
20 ROM
22 Transmission / reception circuit (communication means)
23 control circuit 24 detection circuit (detection means)
25 Power supply circuit 26 FET

Claims (6)

A connection processing system for supplying power by performing connection processing to a connected device connected via an interface from a management control device, wherein communication means for communicating between the management control device and the connected device The management control device performs a process of permitting connection when a predetermined connection condition is satisfied from the power usage information of the connected device obtained by the communication means, and connects the connected device to the connected device via the interface. In addition to supplying power, if the connection is not permitted from the power usage information exceeding the allowable power supply of the management control device, the connected device changes to information that reduces the power usage. A connection processing system which communicates with the management control device again. The connection processing system according to claim 1, wherein the management control device includes a detecting unit that detects an abnormal state of the connected device, and when the abnormality is detected, power supply to the connected device is stopped. . 3. The connection process according to claim 1, further comprising a control unit that performs power distribution control in the body of the connected device according to the amount of power when the amount of used power is reduced in the connected device. system. A connection processing method for supplying power by performing connection processing on a connected device connected to a management control device via an interface, wherein the management control device uses the connected device obtained by communication means. A process for permitting a connection when a predetermined connection condition is satisfied from the power information is performed to supply power to the connected device via the interface, and the allowable power supply of the management control device is determined from the used power information. If the connection is not permitted beyond the limit, the connected device changes to the information that reduces the power consumption and communicates with the management control device again. 5. The connection processing method according to claim 4, wherein when the abnormality is detected by a detection unit that detects an abnormal state of the connected device, the management control device stops power supply to the connected device. 6. The connection processing method according to claim 4, wherein the connected device performs power distribution control in the connected device body according to the amount of power when the amount of used power is reduced.

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