JP2001067157A - Computer system, its peripheral equipment and computer, controlling method, and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously inform a use of the start of a power saving mode through a host PC. SOLUTION: At the time of starting the power saving mode, peripheral equipment 40 informs a host PC 10 of the start of the power saving mode. When application software for using the equipment 40 is started up in the host PC 10, a driver corresponding to the equipment 40 transmits a received message to the application software to display the message to a user, and when the application software for using the equipment 40 is not started, displays the received message by itself to inform the user of the message.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer system, a peripheral device thereof, a computer, a control method, and a storage medium. More specifically, the present invention has a low power consumption state and can be freely connected to a host for communication. The present invention relates to a computer system having a computer peripheral device that can be managed, a peripheral device and a computer, a control method, and a storage medium.

[0002]

2. Description of the Related Art In recent years, as a method of connecting peripheral devices to a personal computer (PC), a USB (Universal Serial Bus) has been used.
versal Serial Bus) has been commercialized. The USB connects a personal computer and a plurality of peripheral devices by serial communication, and includes a plug-and-play (a function for automatically recognizing a connection relationship when a new peripheral device is newly connected or disconnected), a hot-plug system, and a hot-plug system. It has an insertion (a function that allows connection and disconnection while the power is on) or a hot-swap function, and a power supply function, so that users are not bothered about setting of addresses and ID numbers when connecting. It is considered not to exist. In USB, 5V power supply line called VBUS, GND
Line and two signal lines, D + and D-, for a total of 4
Connect and disconnect the book wiring with the dedicated connector. There is a limit to the current value that can be supplied by the power supply line, and the USB standard
It is limited to ~ 500 mA.

Further, the USB defines that a peripheral device must be in a suspend state by a command from a host, and in this suspend state, the current consumption from the VBUS must be reduced to 500 μA. There is a resume command for returning from the suspend state.

In USB, the host PC can recognize that the USB device has been disconnected due to a decrease in the voltage level of the D + line. If it is determined that the USB device has been disconnected from the USB bus, the device driver software corresponding to the device is unloaded from the memory. Thus, the corresponding driver software can be used on the host PC 110 only when the USB device is connected to the USB bus.

On the other hand, not only USB but also devices conventionally used by connecting to a PC are set to a power saving mode when there is no access to the device for a certain period of time in order to save power of those devices. Alternatively, there is one that switches off the power. For example, a digital camera that turns off the power when a state in which no command is received continues for a certain time has been commercialized.

A configuration is also known in which application software is notified that a device enters a power saving mode, and the application software notifies the user of the fact.

[0007]

In the conventional USB, when the power supply of the USB device is turned off to save power, the power supply to the pull-up resistor of the D + line of the USB cable is also stopped. The level drops. As a result, although the USB device is connected to the host PC via the USB cable, the host PC
It is determined that the USB device has been removed, and as described above, the driver corresponding to that device is unloaded and disabled. For the user, without any warning, suddenly,
A very confusing situation in which the USB device cannot be used occurs.

[0008] Further, even if an attempt is made to issue a warning to the user on the host PC before the device enters the power saving mode like other connection means, there is the following problem. That is, unlike a conventional RS232C connection device, the USB device must be in a state where communication is possible from the time of connection to the host. In the case of the RS232C device, it was only necessary to be able to communicate with the device when using the device. However, it is necessary for the USB device to be able to transmit and receive a USB request signal necessary for recognition and configuration of the device at the time of connection. In this state, that is, when there is no operation on the device for a certain period of time in a state where an application that can understand the message from the device has not been started, a message is sent to the application software in the same manner as the RS232C device, and the application software is sent. At this point, if you try to make the wearer warn the user,
Since the application software for operating the device has not been started, a warning cannot be displayed to the user.

An object of the present invention is to provide a computer system, a peripheral device and a computer, a control method, and a storage medium for solving such a disadvantage.

[0010]

A computer system according to the present invention comprises: a host computer; peripheral devices which can be connected to the host computer and shift to a low power consumption mode under a predetermined condition; A computer system comprising a connection medium for connecting the peripheral devices to each other and transmitting a connection signal indicating a connection state between the host computer and the peripheral device between the host computer and the peripheral device in two directions. The peripheral device notifies a predetermined message to the host computer prior to the transition to the low power consumption mode, and the host computer notifies the user of the content corresponding to the predetermined message.

The peripheral device according to the present invention can be freely connected to the host computer via a connection medium that bidirectionally transmits a connection signal indicating a connection state with the host computer, and enters a low power consumption mode under a predetermined condition. The peripheral device to be shifted, a battery serving as a power supply, a connection detection unit that detects connection with the host computer by a connection signal from the host computer, and when the predetermined condition is satisfied,
Message transmitting means for transmitting a signal indicating disconnection of the connection medium as the predetermined message to the host computer, and after outputting a message from the message transmitting means,
Control means for shifting each unit to the low power consumption mode.

A computer according to the present invention is a computer that can be connected to a peripheral device via a connection medium that bidirectionally transmits a connection signal indicating a connection state with the peripheral device, and is activated when the peripheral device is connected. A communication module that directly exchanges data with the peripheral device, a service module that is activated as necessary and exchanges data with the peripheral device via the communication module, and detects an activation state of the service module. When the service module is activated upon receiving the service module detecting means and the predetermined message from the peripheral device, the service module notifies the user of the content of the predetermined message to the user, When the service module is activated upon receiving the predetermined message from If not, characterized by comprising a control means for the content of the predetermined message reported to the user in the communication module.

According to the control method of the present invention, the control method can be freely connected to the host computer via a connection medium that transmits a connection signal indicating a connection state with the host computer in two directions, and enters a low power consumption mode under a predetermined condition. A method for controlling a peripheral device to be shifted, comprising: a connection detecting step of detecting connection with the host computer based on a connection signal from the host computer; and, when the predetermined condition is satisfied, the connection to the host computer as the predetermined message. A message transmission step of transmitting a signal indicating disconnection of a medium, and a control step of shifting each unit to a low power consumption mode after a message is output in the message transmission step.

[0014] The control method according to the present invention is also a control method of a computer which can be connected to a peripheral device via a connection medium for bidirectionally transmitting a connection signal indicating a connection state with the peripheral device. A communication step of directly exchanging data with the peripheral device by a communication module, which is in an activated state when the device is connected, and a service module which is activated as necessary and exchanges data with the peripheral device via the communication module. A data exchange step;
A service module detecting step of detecting an activation state of the service module, and, when the predetermined message is received from the peripheral device, if the service module is activated, the content of the predetermined message is transmitted to the service module. Controlling the communication module to notify the user of the content of the predetermined message when the service module is not activated when the predetermined message from the peripheral device is received. It is characterized by having.

The storage medium according to the present invention stores program software for executing the above-described control method.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention. The USB host PC 10 connects to the peripheral device 40 via the USB cable 30. In the present embodiment, the peripheral device 40 is an electronic still camera.

The host PC 10 has a power supply circuit 12 for supplying power to the VBUS line, and a U.S.C.
SB host control circuit 14, USB data buffer 16,
18, a pull-down resistor 20 for the D + line and a pull-down resistor 22 for the D- line. USB cable 30 is VB
It comprises a signal cable 32 having a US line, a GND line D + line and a D- line, and connectors 34 and 36 on both sides thereof. The connector 34 connects to the host PC 10 and the connector 36 connects to the peripheral device 40. USB host PC10
And the operation of the USB cable 30 are the same as those of the conventional U cable.
These are the same as the SB host PC 110 and the USB cable 130, respectively.

The peripheral device 40 has the following elements.
That is, 42 and 44 are USB data buffers, and 46 is U
SIE circuit for converting an SB serial signal into a parallel signal and vice versa; 48, an EPC circuit for controlling data transmission / reception in accordance with the USB protocol;
Is a RAM serving as a work memory of the CPU 50. 54, an image sensor for converting an optical image into an electric signal; 56, an image processing circuit for performing camera signal processing on an output image signal of the image sensor 54; 58, an image processing circuit 5
Reference numeral 60 denotes a FIFO memory that temporarily holds the output, and reference numeral 60 denotes a removable memory card that finally stores a captured image.
62 is a port control circuit, 64 is a programmable interrupt control circuit, and 66 is a clock oscillation / control circuit.

EPC circuit 48, CPU 50, RAM 5
2. The FIFO 58, the memory card 60, the port control circuit 62, the programmable interrupt control circuit 64, and the clock oscillation / control circuit 66 are connected to the system bus 68.

Reference numeral 70 denotes a latch-up prevention buffer connected to the VBUS line of the signal cable 32, and its output is applied to the port control circuit 62. Reference numeral 72 denotes an operation key of the peripheral device 40, reference numeral 74 denotes a battery serving as a power source of the peripheral device 40, reference numeral 76: a predetermined power supply voltage is generated from an output voltage of the power supply 74, and supplied to portions surrounded by broken lines (blocks 42 to 66). The voltage regulator 78 is connected to the port control circuit 62 and the U
This is a pull-up resistor connected between the SB cable 32 and the D + line. The resistance value of the resistor 78 is 1.5 kΩ.

The operation of the peripheral device 40 will be described. The peripheral device 40 operates with the voltage generated by the battery 74 and the voltage regulator 76. The operations of the USB buffers 42 and 44 and the EPC circuit 48 are the same as in the conventional example. SIE
The circuit 46 includes, in addition to the function of the conventional SIE circuit 246, a signal indicating the state of the USB signal (specifically, a signal indicating that the D + line and the D- line are in the suspended state and returning from the suspend state). (A signal indicating that a resume state has occurred).
It has the function of supplying to

The clock oscillation / control circuit 66 includes a CPU 5
A clock with the frequency indicated by 0 can be output. For example, high-speed signal transfer by USB and control of a photographic lens system and image processing control before and after photographing require a high processing capability of the CPU 50. Therefore, the CPU 50 transmits a high-frequency operation clock to the clock oscillation / control circuit 66. Output. Conversely, when the device is not connected to the USB or when no image is taken, the frequency of the clock output from the clock oscillation / control circuit 66 is kept low to reduce the power consumption of the entire device. When the image is not captured only by the USB communication, the clock supply itself to the image sensor 54, the image processing circuit 56, and the FIFO 58 may be stopped. In this way, controlling the frequency of the clock,
In some cases, by stopping the supply, the power consumption is sequentially reduced, and the consumption of the battery 74 is prevented.

The buffer 72 has an H level or an L level depending on whether or not a predetermined voltage or more is applied to the VBUS signal line.
Is output. When the output of the buffer 72 changes from L to H or from H to L, the programmable interrupt control circuit 64 detects this as an interrupt signal. That is, the battery 7
In the state in which the operating power is supplied by the host PC 10, the host PC 10
To see if it is physically connected to The change of the output of the buffer 70 from L to H indicates that the disconnected connector 34 or 36 has been connected by the user. Therefore, for example, if the CPU 50 has been in the power saving mode until then, the CPU 50 can be shifted to the high-speed mode according to the transition of the output level of the buffer 70. Further, the fact that the output of the buffer 70 is L means that the peripheral device 40
No. 109 is not connected. In this case, even if the CPU 50 is operating in the high-speed mode for photographing, the supply of the clock to the SIE circuit 46 and the EPC circuit 48 may be stopped, thereby reducing unnecessary power consumption.

The port control circuit 62 reads the output of the buffer 72 and the key operation of the operation key 72, and controls the voltage application to the pull-up resistor 78 according to the read result or the instruction from the CPU 50. By setting the voltage applied to the pull-up resistor 78 to 3.3 V, the voltage rises up to the D + line, and by setting the applied voltage to 0 V or HiZ,
It can be pulled down or opened for the + line. Thus, by pulling up the pull-up resistor 78 when the peripheral device 40 is ready for communication, the U peripheral device 40
It can be recognized that they are connected by the B cable 30. Conversely, if communication is not ready, pull-up resistor 78 is pulled down or opened,
The host PC 10 can recognize that the peripheral device 40 is not connected, and the host PC 10
Do not start communication such as address setting for. When the peripheral device 40 is ready for communication, the pull-up resistor 7
8 is pulled up, the host PC 10
0 is recognized as connected.

A sequence for shifting to the power saving mode according to the present embodiment will be described. As described above, the SIE circuit 46 and the EP
USB with minimum necessary clock supply to C circuit 48
The power consumption can be suppressed while maintaining a communicable state. However, at present, when the peripheral device 40 is not used for a long time, it is necessary to stop the clock supply to the SIE circuit 46 and the EPC circuit, and to reduce the power consumption by setting a mode in which the USB communication is not performed. In the following description,
The power saving mode indicates a state in which the peripheral device 40 is set to a state in which USB communication is not possible.

FIG. 2 shows a flowchart of a sequence for shifting to the power saving mode. When the peripheral device 40 enters the power saving mode, first, it is checked whether or not the peripheral device 40 is connected to the host PC 10 (S1). This can be understood by detecting the level of the VBUS line as described above. If it is not connected to the host PC 10 (S1), the power supply of the peripheral device 40 is shut down as it is (S2).
Enter power saving mode.

When the peripheral device 40 is connected to the host PC 10 (S1), a message notifying that the power saving mode is to be issued is issued to the host PC 10 (S3), and the message is transmitted on the USB bus. (S4), the pulldown of the D + line is stopped (S5), and the power supply of the peripheral device 40 is shut down (S2).

The operation of the host PC 10 in response to this will be described. FIG. 3 is a schematic diagram illustrating an operation model of the host PC 10. For the sake of explanation, it is assumed that three processes are running. The first process A is an OS (operating system).
This is a process provided by a system such as (system), and when the peripheral device 40 is connected to the USB bus, the peripheral device 4
The driver object associated with 0 is expanded on the memory. Data is exchanged with the device via the driver object. This allows
Just by connecting the peripheral device 40 to the USB bus, a necessary driver object is generated, and communication with the peripheral device 40 becomes possible. However, in this state, the peripheral 4
User application software that uses 0 has not been started.

Process B is user application software that uses the device. The application software process also maps the driver objects to the process space of each application in order to access the peripheral device 40.

In the present embodiment, when a driver object mapped to each process is generated, a counter (initialized by 0) prepared in advance in a shared space accessible to each process is created. ), And when those driver objects are deleted,
The counter is decremented.

When there is one application process,
This counter is 2. This is because the driver object mapped by the system first increments this counter to one, and then the driver object mapped by the application process increments the counter to two.

Referring to FIG. 4, the operation when the driver object receives a message from peripheral device 40 will be described.

First, upon receiving a message from the peripheral device 40, the value of the above-mentioned counter is checked (S11).
If the count value is greater than 1 (S11), it is determined that there is application software that handles the message of this device, and the received message is passed to the corresponding application software as it is (S1).
2).

If the count value is 1 or less (S11), the application handling the message from the peripheral device 40
When it is determined that the software does not exist, the driver object itself displays a warning message to notify the user (S13).

If the process C exists simultaneously and there are two or more application processes that handle messages from the peripheral device 40, the event may be managed using a table instead of the above-described counter. In this case, a table for storing event objects as shown in FIG. 5 is arranged in the above-mentioned sharable memory space,
When a driver object mapped to each process is generated, an event object may be registered in the table.

An event object is an object that can actively notify this process that a message from a device has arrived by actively signaling this object.

FIG. 6 shows an operation flowchart when receiving a message from the peripheral device 40 and other peripheral devices.

When a message from the peripheral device is received, the event object table is examined (S21). If at least one event object is registered (S21), the event object is activated (S22) to notify the application software that handles the message from the peripheral device of the received message. Furthermore, it is checked whether another event object is registered in the table (S
23) If it exists (S23), return to S22 and activate the event object (S22).
Until there are no more event objects registered in the table (SA23), S22 is repeatedly executed.

If no event object is registered in the table (S21), it is determined that there is no application software that handles messages from the peripheral device, and the driver object itself displays a warning message. The user is notified (S24).

With this configuration, even if there is no application software that handles events from peripheral devices, or if there are a plurality of application software that handles events, depending on the situation, Warnings can be displayed to the user in a manner that is easy to understand.

The process performed on the host PC 10 may be changed as follows. FIG. 7 is a schematic diagram of another process configuration on the host PC.

In FIG. 3, each process maps a driver object, but in FIG. 7,
Only one process maps the driver object. This process is here called a server process. The server process may be started when the peripheral device is connected to the USB bus, or may be started when the host PC 10 itself is started. The server process owns the driver object for the USB peripheral device and functions as the only process that actually communicates with the peripheral device.

The application software using the peripheral device is expressed as a process A, a process B or a process C shown in FIG. Although FIG. 7 illustrates the process A as a process provided by the system software, if the system software does not provide a process for operating the USB peripheral device, all processes are user applications. These will be referred to as client processes. The client process exchanges messages with the server process and communicates with peripheral devices.

In this model, when processing a message from a peripheral device, an event table similar to that described in the configuration shown in FIG. 3 is held in the server process.
Each client process registers an event handle with the server process when it starts, and waits for the event handle to be activated.

The server process processes messages from peripheral devices in the same flow as shown in FIG. When no event object is registered in the event table, that is, when no client process exists, the driver object itself displays a warning, or the server process displays a warning.

With such a configuration, the coupling between processes can be reduced, and a configuration in which the client process and the server process exist in different PCs can be realized. Messages from peripheral devices can be displayed in a manner that is easy for the user to understand, depending on the situation, while allowing the system configuration flexibility.

The present invention may be applied to a system constituted by a plurality of devices or to an apparatus constituted by a single device.

Also, in order to operate various devices so as to realize the functions of the above-described embodiments, software for realizing the functions of the above-described embodiments is installed in a computer in an apparatus or a system connected to the various devices. The present invention also includes a case in which a program (code) is supplied and a computer (CPU or MPU) of the apparatus or system is operated by operating the various devices according to stored programs.

In this case, the software program code itself implements the functions of the above-described embodiment, and the program code itself and means for supplying the program code to the computer, for example,
A storage medium storing such a program code constitutes the present invention. As a storage medium for storing such a program code, for example, a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, C
A D-ROM, a magnetic tape, a nonvolatile memory card, a ROM, and the like can be used.

When the computer executes the supplied program code, not only the functions of the above-described embodiment are realized, but also the OS (operating system) or other operating system running on the computer. Even when the functions of the above-described embodiments are realized in cooperation with application software and the like, it goes without saying that such program codes are included in the embodiments of the invention according to the present application.

Further, the supplied program code is
After being stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU or the like provided in the function expansion board or the function expansion unit performs one of the actual processing based on the instruction of the program code. It is needless to say that a case where the functions of the above-described embodiments are realized by performing all or part of the processes and executing the processing is also included in the invention according to the present application.

[0053]

As can be easily understood from the above description, according to the present invention, even in a peripheral device connected to a bus such as a USB bus which is dynamically constructed, it is necessary to enter a power saving mode or the like. After the user is notified of the departure from the bus configuration, the user can deviate from the bus configuration, and a system that is easy for the user to understand can be configured.

A warning message can be displayed to the user even when the application software using the peripheral device is not running, and when the application software is running, the driver issues a warning. Is passed to the application software without displaying the same, the same warning message is not displayed in the driver and the application software in a superimposed manner, and an environment that is easy for the user to understand can be provided.

It is possible to provide a degree of freedom that can be extended to a client / server type network system, and to display a warning according to the system status.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of a transition sequence to a power saving mode in the present embodiment.

FIG. 3 is a schematic diagram showing an operation model on the host PC 10.

FIG. 4 is a flowchart showing processing of a message from a peripheral device.

FIG. 5 is a structural example of a table for storing event objects.

FIG. 6 is a flowchart of an operation of processing a message from a peripheral device while a plurality of application software are running.

FIG. 7 is a schematic diagram showing another operation model on the host PC 10.

[Explanation of symbols]

10: USB host PC 12: Power supply circuit 14: USB host control circuit 16, 18: USB data buffer 16, 18, 20, 22: Pull-down resistor 30: USB cable 32: Signal cable 34, 36: Connector 40: Peripheral device 42, 44: USB data buffer 46: SIE circuit 48: EPC circuit 50: CPU 52: RAM 54: Image sensor 56: Image processing circuit 58: FIFO memory 60: Memory card 62: Port control circuit 64: Programmable interrupt control circuit 66: Clock Oscillation / control circuit 68: System bus 70: Latch-up prevention buffer 72: Operation key 74: Battery 76: Voltage regulator 78: Pull-up resistor 110: USB host 112: Power supply circuit 114: USB host control circuit 116, 118: USB data Buffer 120 and 122: a pull-down resistor 130: USB cable 132: signal cable 134: connector 140: Peripherals 142, 144: USB data buffer 146: SIE (Serial Interface Engine)
Circuit 148: EPC (Endpoint Controller) circuit 150: CPU 152: RAM 154: Image sensor 156: Image processing circuit 158: FIFO memory 160: Memory card 162: System bus 164: Current limiter 166: Voltage regulator 168: Pull-up resistor

Claims (17)

[Claims] 1. A host computer, a peripheral device which is freely connectable to the host computer and shifts to a low power consumption mode under a predetermined condition, and a host computer and the peripheral device which are connected to each other, A computer system comprising a connection medium that bidirectionally transmits a connection signal indicating a connection state with the peripheral device between the host computer and the peripheral device, wherein the peripheral device enters the low power consumption mode. A predetermined message is notified to the host computer prior to the migration, and the host computer notifies the user of the content corresponding to the predetermined message. 2. The peripheral device further includes: a battery serving as a power supply; connection detection means for detecting connection with the host computer based on a connection signal from the host computer; 2. The communication device according to claim 1, further comprising: a message transmitting unit that transmits a signal indicating disconnection of the connection medium as the predetermined message; and a control unit that shifts each unit to a low power consumption mode after the message transmitting unit outputs a message. Computer system. 3. The host computer is in an activated state when the peripheral device is connected, and a communication module for directly exchanging data with the peripheral device, and a host module which is activated when necessary and communicates with the peripheral device via the communication module. A service module for exchanging data with the device, a service module detecting means for detecting an activation state of the service module, and a service module which is activated when the predetermined message is received from the peripheral device. ,
If the service module is not activated when the service module is notified of the content of the predetermined message and the user receives the predetermined message from the peripheral device, the content of the predetermined message is transmitted to the communication module. 2. The computer system according to claim 1, further comprising control means for causing the user to be notified. 4. The service module detection unit detects the activation state of each service module by referring to the activation information of each service module stored in a resource area accessible to all the service modules. A computer system according to claim 1. 5. The service module detecting means refers to activation information of each service module stored in a resource area accessible only by the communication module by exchanging messages with all the service modules by the communication module. 4. The computer system according to claim 3, wherein the activation state of each service module is detected. 6. A peripheral device that is freely connectable to the host computer via a connection medium that bidirectionally transmits a connection signal indicating a connection state with the host computer, and shifts to a low power consumption mode under predetermined conditions. Connection detecting means for detecting connection with the host computer based on a connection signal from the host computer, and transmitting a signal indicating disconnection of the connection medium as the predetermined message to the host computer when the predetermined condition is satisfied. A peripheral device comprising: a message transmitting unit; and a control unit configured to shift each unit to a low power consumption mode after outputting a message from the message transmitting unit. 7. A computer connectable to a peripheral device via a connection medium that bidirectionally transmits a connection signal indicating a connection state with the peripheral device, wherein the computer is activated when the peripheral device is connected. A communication module that directly exchanges data with the peripheral device, a service module that is activated as needed and exchanges data with the peripheral device via the communication module, and a service module detection that detects the activation state of the service module Means, when the service module is activated upon receiving the predetermined message from the peripheral device,
If the service module is not activated when the service module is notified of the content of the predetermined message and the user receives the predetermined message from the peripheral device, the content of the predetermined message is transmitted to the communication module. And control means for causing the user to be notified. 8. The service module detection unit detects the activation state of each service module by referring to the activation information of each service module stored in a resource area accessible to all the service modules. A computer as described in. 9. The service module detection unit refers to the activation information of each service module stored in a resource area accessible only by the communication module by exchanging messages with all the service modules. 8. The computer according to claim 7, wherein the computer detects an activation state of each service module. 10. Control of a peripheral device which can be freely connected to the host computer via a connection medium for transmitting a connection signal indicating a connection state with the host computer in two directions and which shifts to a low power consumption mode under predetermined conditions. A connection detection step of detecting connection with the host computer based on a connection signal from the host computer; and a signal indicating disconnection of the connection medium as the predetermined message to the host computer when the predetermined condition is satisfied. After the message sending step of sending the message, and the message output by the message sending step,
A control step of shifting each unit to a low power consumption mode. 11. A computer control method for connecting a peripheral device via a connection medium that bidirectionally transmits a connection signal indicating a connection state with the peripheral device, wherein the computer is activated when the peripheral device is connected. Yes, a communication step of directly exchanging data with the peripheral device by the communication module, a data exchange step by a service module activated as necessary and exchanging data with the peripheral device via the communication module, A service module detection step of detecting an activation state of the module; and, when the service module is activated when the predetermined message is received from the peripheral device,
If the service module is not activated when the service module is notified of the content of the predetermined message and the user receives the predetermined message from the peripheral device, the content of the predetermined message is transmitted to the communication module. A control step of causing the user to be notified. 12. The service module detecting step detects an activation state of each service module by referring to activation information of each service module stored in a resource area accessible to all the service modules. The control method described in 1. 13. The service module detecting step includes, in the communication module, exchanging a message with all the service modules to refer to activation information of each service module stored in a resource area accessible only by the communication module. 12. The control method according to claim 11, wherein the activation state of each service module is detected. 14. Control of a peripheral device which is freely connectable to the host computer via a connection medium for transmitting a connection signal indicating a connection state with the host computer in two directions, and shifts to a low power consumption mode under predetermined conditions. A connection detection step of detecting connection with the host computer based on a connection signal from the host computer; and a signal indicating disconnection of the connection medium as the predetermined message to the host computer when the predetermined condition is satisfied. , And a program for executing a control method including a message transmitting step of transmitting a message and a control step of shifting each unit to a low power consumption mode after a message is output by the message transmitting step. Storage medium. 15. A computer control method for connecting a peripheral device via a connection medium that bidirectionally transmits a connection signal indicating a connection state with the peripheral device, wherein the computer is activated when the peripheral device is connected. Yes, a communication step of directly exchanging data with the peripheral device by the communication module, a data exchange step by a service module activated as necessary and exchanging data with the peripheral device via the communication module, A service module detection step of detecting an activation state of the module; and, when the service module is activated when the predetermined message is received from the peripheral device,
If the service module is not activated when the service module is notified of the content of the predetermined message and the user receives the predetermined message from the peripheral device, the content of the predetermined message is transmitted to the communication module. And a control step of causing the user to be notified. 16. The service module detecting step detects the activation state of each service module by referring to the activation information of each service module stored in a resource area accessible by all the service modules. A storage medium according to claim 1. 17. The service module detecting step, wherein the communication module refers to activation information of each service module stored in a resource area accessible only by the communication module by exchanging messages with all the service modules. The storage medium according to claim 15, wherein the activation state of each service module is detected.