TWI510925B - Remote management device for detecting status of controlled computers - Google Patents

Description

Remote management device capable of detecting the state of the controlled computer

The invention relates to a remote management device, in particular to a remote management device capable of detecting the state of a controlled computer.

A keyboard-Video-Mouse Switch (KVM Switch) can be used to connect a group of central control devices (such as a set of keyboards, screens, and mice) to a remote computer host through a KVM switch. Switch and operate separately. However, since each computer host is far away from the operator, the more computer hosts are connected, the more difficult it is for the operator to grasp the current state of each computer host. Therefore, in the prior art, an automatic scanning (Auto-scan) method has been proposed. As shown in FIG. 1, in a multi-computer switching system, a KVM switch 11 sequentially scans all the controlled computers 12 connected to all of the ports, and then sequentially receives the received image signals 13 based on the received images. The image of the controlled computer 12 is presented on the screen of the central control unit 15 so that the user 14 can observe the status of all the controlled computers 12. During the scanning process, the KVM switch 11 must be sequentially switched to obtain the image signals of all the controlled computers 12.

However, since the method of obtaining the image signal of the controlled computer is performed by sequential scanning, the conventional automatic scanning technology can only observe the state of one controlled computer at a time, even if the division is added to the KVM switch. The picture-in-picture technique also limits the number of controlled computers each time.

In addition, if a controlled computer 12 is in a sleep state or a shutdown state, the user will not be able to observe the state of the controlled computer 12. This is because the controlled computer 12 does not output the video signal 13 at this time, so the user 14 cannot judge the controlled computer. 12 is in a sleep state or a shutdown state, and must be switched to the controlled computer 12, and then sent a keyboard or mouse signal to wake up the controlled computer 12 to receive its video signal 13.

Furthermore, although the known "Intelligent Platform Management Interface" (IPMI) technology can also detect the state of the controlled computer, a separate substrate management controller must be installed on the motherboard of the controlled computer. (Baseboard Management Controller), and the controlled computer also needs to have a network interface to transmit IPMI related detection signals to the administrator via the network.

According to the concept of the present invention, a management system is provided for electrically connecting a central control device to at least one controlled computer. The management system includes at least one KVM switch, and the KVM switch includes a universal serial bus. a USB (USB) interface for electrically connecting to one of the USB ports of the controlled computer, the KVM switch electrically connected to the central control device; and a USB device controller electrically connected to the KVM switch And communicating with the USB host controller of the controlled computer via the USB interface, wherein the KVM switch detects the controlled device according to a USB request command received by the USB device controller from the USB host controller One of the states of the computer.

According to another aspect of the present invention, a management system is provided for electrically connecting a central control device to at least one controlled computer, and the management system includes at least one KVM switch electrically connected to the central control device; An adapter for electrically connecting one of the controlled computers to the KVM switch, the adapter further comprising at least one housing; a universal serial bus (USB) interface for electrically connecting a USB port of the controlled computer; and an image conversion unit disposed in the housing for controlling the One of the computer output signals is converted into a differential video signal, and the differential video signal is transmitted to the KVM switch; a USB device controller is disposed in the housing, and the USB interface is connected to the The USB host controller of the control computer communicates, wherein the KVM switch can detect a state of the controlled computer according to a USB request command received by the USB device controller from the USB host controller.

According to still another aspect of the present invention, a method for detecting a state of at least one controlled computer is provided. The method is implemented in a remote management system, where the remote management system includes a remote management device and at least one adapter. The method includes the following steps: electrically connecting the remote management device to the at least one controlled computer via the at least one adapter; performing an inspection command on the at least one controlled computer by the at least one adapter Action; determining a state of the at least one controlled computer according to the action.

According to still another aspect of the present invention, a method for detecting a state of at least one controlled computer is provided. The method is implemented in a remote management system, where the remote management system includes a remote management device and at least one adapter. The method includes the following steps: electrically connecting the remote management device to the at least one controlled computer via the at least one adapter; performing a USB enumeration action on the at least one controlled computer by the at least one adapter; Determining a state of the at least one controlled computer according to a universal sequence bus (USB) request command received from the at least one controlled computer received in the USB enumeration process.

The present invention will be fully understood by the following examples, which can be accomplished by those skilled in the art, and the implementation of the present invention is not limited by the following examples.

The invention applies the universal serial bus (USB) technology, and uses the currently specified USB protocol to connect and communicate between the remote management system and the controlled computer.

The first embodiment of the present invention will be described below, see Fig. 2(A). The present invention discloses a remote management system 10 comprising at least one remote management device and one or more adapters 200. The remote management device can be a KVM switch 100. The KVM switch 100 is electrically connected to a group of central control devices 150 by its first interface 110. The KVM switch 100 is further electrically connected to the second interface 120 via the adapters 200 in a one-to-one correspondence manner. Connected to multiple controlled computers 300. The KVM switch 100 internally has an image switcher and a signal path arrangement unit. Thus, a user 14 can control the one or more controlled computers 300 through the central control device 150. The central control device 150 can include a set of keyboards 15A, 15B and 15C, or other types of cursor control devices.

The first interface 110 can include at least one keyboard/mouse port (such as a PS/2 connector or a USB connector) and an image port (such as a VGA connector or a DVI connector). The first interface 110 outputs the image signal from a controlled computer 300 to the screen 15B via a path, and receives control signals from the keyboard 15A and the mouse 15C. The control signals from the keyboard 15A and the mouse 15C are controlled. It will be further processed for transmission to the adapter 200 in a manner consistent with the RS485 specification. In this way, the user 14 can control the one or more controlled computers 300 through the central control device 150. The second interface may be a plurality of RJ-45 ports, and each RJ-45 port is further connected to each of the adapters 200 by a regional network cable (for example, a CAT-5 cable or the like). The twisted pair cables are connected to each other.

The adapter 200 is also referred to as a server interface module (SIM), and is mainly used to extend the distance between the KVM switch 100 and the controlled computer 300 so that the image from the controlled computer 300 is obtained. Signal and from the central control unit The 150 keyboard/mouse signal can be transmitted to a greater distance. In this way, the user 14 located in front of the central control device 150 can perform remote management on the controlled computer 300.

As shown in FIG. 2(B), each adapter 200 further includes a housing 210, a USB interface 220, an image interface 225, an image conversion unit 230, and a USB device controller (Device Controller) 250. A processor 260 and an RS485 transceiver 270.

The USB interface 220 is electrically connected to one of the USB ports of the controlled computer 300. The image conversion unit 230 is disposed in the casing, and the controlled computer 300 is output from the image through the image interface 225. A single-ended video signal is received and converted into a differential video signal, and the differential video signal is transmitted to the KVM switch 100. In a preferred embodiment, the image conversion unit 230 is mainly composed of at least one operational amplifier (Operational Amplifier). The processor 260 is configured to convert the USB signal received by the USB device controller 250 from the controlled computer 300 into an RS232 signal and then transmit the signal to the RS485 transceiver 270. The RS485 transceiver 270 converts the RS232 signal (single-ended signal) into The RS485 signal (differential signal) is transmitted to the KVM switch 100. This RS485 transceiver 270 can be implemented by ADM485 provided by Analog Devices. With the configuration of the present invention, the distance between the KVM switch 100 and the adapter 200 can be as much as 300 to 1000 inches.

The KVM switch 100 further optionally includes an image compensation unit (not shown) for compensating for image quality degradation caused by long distance transmission and CAT-5 cable lengths, such as High frequency signal attenuation and color separation (Skew) and other issues. The image compensation unit (not shown) can be implemented by a wafer such as EL9111, EL9112, and/or EL9115 supplied by Intersil.

The USB device controller 250 is also disposed in the housing 210, and communicates with the USB host controller 310 of the controlled computer 300 via the USB interface 220. The keyboard/mouse signal from the central control device 150 is transmitted to the controlled computer 300 via the USB interface 220. The USB host controller 310 may be located in the Nanqiao chip on the motherboard of the controlled computer 300, or be a separate chip. According to the standard USB protocol, during the enumeration process, the USB device controller 250 passes its description element to the USB host controller 310, such as a device descriptor, a configuration descriptor. , interface descriptor and endpoint descriptor. The above description represents the keyboard, mouse and/or other USB device (eg, a virtual medium) of the central control device. The USB device controller 250 can pass the description element to the USB host controller 310 via a hub (eg, a hub, not shown). The USB host controller 310 then configures the USB device controller 250 according to these description elements, so that the adapter 200 can simulate a USB keyboard, a USB mouse, and/or other USB on the controlled computer 300. A device (such as a virtual medium). The device description element further includes a supplier identifier ( idVendor ) and a product identifier ( idProduct ). The operating system of the controlled computer 300 can select the corresponding driver according to the supplier identification code and the product identification code, so that the USB keyboard, USB mouse and other USB devices can be correctly controlled subsequently.

The KVM switch 100 of the present invention can detect a plurality of states of the controlled computer 300 according to a plurality of USB request commands received from the USB host controller 310 by the USB device controller 250, such as a BIOS state and an operating system (Operation). System, OS) state, sleep state, and shutdown-down state.

Referring to FIG. 3(A), when the enumeration is started (step S301), after the USB device controller 250 reports all necessary description elements to the USB host controller 310, the host controller 310 will respond to the USB device controller 250. Perform configuration configuration (configure), at this time, the KVM switch 100 will detect whether the adapter 200 is received. A set configuration (Set_Configuration) request instruction and a set agreement (Set_Protocol) request instruction specified by the USB protocol (step S302). When the adapter 200 does not receive the Set_Configuration request command, the KVM switch 100 determines that the enumeration has failed (step S308), and the detected action ends; when the adapter 200 receives the Set_Configuration request command, it continues. It is judged whether or not the Set_Protocol request instruction has been received (step S303). If the adapter 200 receives the Set_Configuration request command but does not receive the Set_Protocol request command, it determines that the controlled computer 300 is currently in the OS state (step S304); if the adapter 200 receives the Set_Configuration request command and Set_Protocol When the instruction is requested, it is judged that the controlled computer 300 is currently in the BIOS state (step S305).

Alternatively, it is determined whether the controlled computer 300 is in the OS state or the BIOS state, as shown in the flow of FIG. 3(B). Step S303 further includes a step of confirming the value of the wValue field (S306), wherein wValue is a field in the Set_Protocol request instruction. Therefore, when the adapter 200 receives the Set_Protocol request command, but the wValue field value in the Set_Protocol request command is 1, it is also determined that the controlled computer 300 is currently in the OS state (step S304); if the wValue field If the value is not 1 (i.e., 0), it is judged that the controlled computer 300 is currently in the BIOS state (step S305).

In order to detect the state of the controlled computer 300, the KVM switch 100 of the present invention can automatically send a "Reconnect" command to each of the adapters 200 according to the needs of the user (step S309), which is "reconnected". The command will cause the USB device controller 250 to be detached from the USB bus and then connected again, so that the USB host controller 310 of the controlled computer 300 and the USB device of the adapter 200 are controlled. The enumeration process specified by the USB protocol is repeated between the devices 250. Basically, this reconnected instruction refers to a virtual plug-in operation (Plug-In and Plug-Out) between the adapter 200 and the controlled computer 300. That is to say, it is as if the analog adapter 200 first pulls out and then inserts the USB port of the controlled computer 300. Therefore, when the USB device controller 250 is reconnected with the USB host controller 310, the USB device controller 250 function of the adapter 200 starts to be activated, and the USB host controller 310 of the controlled computer 300 is again enumerated. action.

In addition, determining whether the controlled computer 300 is in a dormant state or a shutdown state can be as shown in the flow of FIG. 3(C). The KVM switch 100 of the present invention can determine whether the adapter 200 receives the Set_Feature request command specified by the USB protocol and the data of the DEVICE_REMOTE_WAKEUP field in the Feature Selector field. Whether or not the controlled computer 300 enters a sleep state (steps S311-S314). According to the USB protocol, during the enumeration process, the USB device controller 250 informs the USB host controller 310 of its ability to support Remote Wakeup via the bmAttributes field (the seventh field) in its configuration descriptor. The configuration properties of the seventh field are represented by the bit pattern shown in Table 1.

Except for the bits D5 and D6, the remaining bits are fixed values. D5=1 means support remote wake-up function, D5=0 means no support. D6=1 means that the device has a self-power supply. At this time, the power provided by the busbar can still be used at the same time. If D6=0, it means that it is not available.

Before the USB host controller 310 enters the sleep state, the USB host controller 310 sets or activates the remote wake-up capability of the USB device controller 250 via the status selection unit field in the Set_Feature request command. After the USB host controller 310 leaves the sleep state, it will issue a clear state. (Clear_Feature) requests an instruction to cancel the remote wake-up function of the USB device controller 250.

In the present invention, since the USB host controller 310 can be set to poll the USB device controller 250 at a timing (for example, at intervals of 8 milliseconds), and this polling command is a control transfer (Control Transfer). . According to the specification of the USB protocol, the control transmission must be transmitted to the USB device controller 250 via the endpoint zero. Therefore, the KVM switch 100 of the present invention can be based on a timer (not shown) and the USB device controller 250. The zero endpoint determines whether a polling command sent from the USB host controller 310 of the controlled computer 300 is received (step S315). If the zero endpoint does not receive the polling command within the preset time period, Then, it can be judged that the controlled computer 300 has entered the shutdown state of the operating system (step S316). Alternatively, if the USB device controller 250 does not receive any Set_Feature request command (indicating that it enters the sleep state) from the USB host controller 310 beforehand, and does not have a polling command (steps S312-S315), it can be determined. The controlled computer 300 has entered the shutdown state of the operating system (step S316). Similarly, the KVM switch 100 can re-send the above-mentioned determination and check instructions according to the needs of the user or automatically send a "Reconnect" command to each of the adapters 200 (step S317). According to the USB protocol, this polling interval can be set by the bInterval field (sixth field) of the endpoint description element. The timer can be implemented by the hardware, software or body of the KVM switch 100, and is not limited in the present invention.

Furthermore, the KVM switch 100 of the present invention can determine whether there is a control transmission or an Interrupt Transfer between the USB device controller 250 and the USB host controller 310 for a predetermined period of time. As described above, since the adapter 200 of the present invention is simulated as a USB keyboard or mouse, and the USB keyboard or mouse transmits the USB related signal in an interrupt transmission mode, the USB device controller 250 is in the non-off state. There must be an interrupt transfer between the USB host controllers 310. Therefore, if during the preset time, the USB device controller 250 and the USB host controller 310 do not perform any control transmission or interrupt transmission between the zero endpoint or other endpoints, the controlled computer can be judged. 300 has entered the shutdown state.

After collecting the status of all the controlled computers 300, the KVM switch 100 can provide a user interface for the user to simultaneously observe the status of all the controlled computers 300, for example, simultaneously observe the status of 256 controlled computers 300. This user interface can be an on-screen display menu (OSD). At this point, the user can further manage and control the controlled computer 300 in different states according to their needs. For example, one of the BIOS states or one of the controlled computers 300 is set as the first group; one of the OS states or one of the controlled computers 300 is set to the second group; one or more of the sleep states are The control computer 300 is set to the third group; one of the shutdown states or the plurality of controlled computers 300 is set to the fourth group.

Thereafter, for the third group in the dormant state, a wake-up command may be transmitted in a broadcast or multi-cast manner to wake up the controlled computer in the group; or, for the third group The group 200 receives a trigger signal (which can be a keyboard/mouse signal) sent from the KVM switch 100, and the adapter 200 generates a negative pulse (for example, a width of 10 milliseconds) to Controlled computer 300 in the group wake. In addition, for the second group in the OS state, a sleep command may be transmitted in a broadcast or multicast manner to cause the controlled computer 300 in the group to enter a sleep state; or, for the second group, A shutdown command is transmitted by broadcast or multicast to cause the controlled computer 300 in the group to enter a shutdown state.

According to the foregoing function for detecting the state of the controlled computer, the present invention can further detect the abnormal state of the following three types of computers, including (1) system execution error, (2) reboot failure (Reboot Failure), and (3) shutdown failure (Power). -off Failure). For example, if the user has transmitted a shutdown command by means of broadcast or multicast, the controlled computer 300 of a certain group is turned off, and after a preset time, the detected computer status indicates that the If the control computer 300 does not enter the shutdown state, it can be judged that the state of the computer is abnormal. At this time, the KVM switch 100 can issue a warning to the user by any suitable means, for example, the user can be notified by the OSD, or It can be transmitted by mobile phone newsletter. If the central control device 150 has a speaker, the KVM switch 100 can also transmit a signal to the speaker to issue a warning.

Figure 4 is a second preferred embodiment of the present invention. In a remote management system 10, a remote management device (e.g., a KVM switch) 100 has a third interface 130 via a network. 16 is electrically connected to a central control device 150. Alternatively, the remote management device 100 is electrically connected to a central control device 150 via a central control module 140 via a fourth interface 135. The central control module 140 is used to extend a central control device. The distance between 150 and the remote management device 100. In addition, the remote management device 100 is electrically connected to the plurality of controlled computers 300 in a one-to-one correspondence manner via the second interface 120 via the adapters 200, so that a user 14 can be controlled by the central control device 150. The one or more controlled computers 300. The third interface 130 is a network interface, and the central control device 150 further includes a control computer 160. The control computer 160 executes a control program, so that the control computer 160 can be connected with the control computer 160. The computer switch 100 performs network communication. In this way, the image signal outputted by the controlled computer 300 can be transmitted to the control computer 160 in the form of a network packet, and the keyboard/mouse signal outputted by the central control device 150 can also be transmitted to the KVM switch 100 in the form of a network packet. The KVM switch 100 then unpacks/restores the network packet into a general non-network/standard format. In this embodiment, the user interface displaying the status of the plurality of controlled computers can be an OSD or a web page. In this embodiment, the hardware structure/body of the adapter 200 is not different from the adapter in the foregoing embodiment, and the state of the controlled computer 300 can also be detected according to the USB protocol. I will repeat them.

It should be noted that, regardless of the first or second embodiment of the present invention, any computer host having a USB host controller can be managed by the KVM switch of the present invention, that is, the controlled computer does not need to be implemented. Additional hardware or software is installed in the present invention. In addition, in the foregoing embodiments, the adapter 200 is electrically connected between the KVM switch 100 and the controlled computer 300. However, in another preferred embodiment, no transfer is required. The presence of the device 200. That is, if at least one of the USB device controllers 250 is already included in the housing of the KVM switch 100 or on the circuit board, and since the KVM switch itself usually includes multiple USB interfaces, it can be directly connected to the controlled The USB connection of the computer 300 is 埠, and the state of the controlled computer 300 is also detected according to the USB protocol. In addition, the KVM switch 100 of the present invention can also cascade another KVM switch in a Daisy-Chain or Cascade manner to expand the number of controlled computers.

While the present invention has been described above by way of example, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. Other different embodiments are contemplated, and the scope of the present invention is defined by the scope of the appended claims.

10‧‧‧ Remote Management System

100‧‧‧Multicomputer switcher

11‧‧‧Multicomputer switcher

110‧‧‧ first interface

12‧‧‧Controlled computer

120‧‧‧second interface

13‧‧‧Image signal

130‧‧‧ third interface

135‧‧‧Fourth interface

14‧‧‧Users

140‧‧‧Central Control Module

15A‧‧‧ keyboard

15B‧‧‧ screen

15C‧‧‧mouse

150‧‧‧Central control unit

16‧‧‧Network

160‧‧‧Control computer

200‧‧‧Adapter

210‧‧‧Shell

220‧‧‧USB interface

225‧‧‧Image interface

230‧‧‧Image Conversion Unit

250‧‧‧USB device controller

260‧‧‧ processor

270‧‧‧RS485 transceiver

300‧‧‧Controlled computer

310‧‧‧USB host controller

Figure 1: Schematic diagram of the traditional multi-computer switching system scanning.

Figure 2(A): Schematic diagram of the remote management system of the present invention.

Fig. 2(B) is a schematic view showing the construction of the adapter of the present invention.

Fig. 3(A) is a flow chart showing the state judgment of the present invention.

Fig. 3(B) is a flow chart showing the state of the present invention.

Fig. 3(C): Flow chart of state determination of the present invention.

Figure 4: Schematic diagram of the remote management system of the present invention.

10‧‧‧ Remote Management System

100‧‧‧Multicomputer switcher

110‧‧‧ first interface

120‧‧‧second interface

14‧‧‧Users

15A‧‧‧ keyboard

15B‧‧‧ screen

15C‧‧‧mouse

150‧‧‧Central control unit

16‧‧‧Network

160‧‧‧Control computer

200‧‧‧Adapter

210‧‧‧Shell

220‧‧‧USB interface

230‧‧‧Image Conversion Unit

250‧‧‧USB device controller

260‧‧‧RS485 transceiver

Claims (39)

A management system for electrically connecting a central control device to at least one controlled computer, the management system comprising at least: a KVM switch including a universal serial bus (USB) interface for electrically connecting the a USB port of the controlled computer, the KVM switch is electrically connected to the central control device; and a USB device controller is electrically connected to the KVM switch, and is connected to the controlled computer via the USB interface A USB host controller communicates, wherein the KVM switch detects a state of the controlled computer according to a USB request command received by the USB device controller from the USB host controller. The management system of claim 1, wherein the KVM switch can issue a reconnection command to the USB device controller, so that the USB device controller re- enumerates the controlled computer to detect The state of the computer being controlled. The management system of claim 1, wherein the USB request instruction is selected from a group consisting of a Set_Configuration request instruction, a Set_Protocol request instruction, and a Set_Feature request instruction. . The management system of claim 1, wherein the state selection is selected from the group consisting of a basic input/output system (BIOS) state, an operating system state, a sleep state, and a shutdown state. The management system of claim 1, wherein the KVM switch sends a broadcast command or a multicast command to the controlled computer according to the detected state to change the state of the controlled computer. . The management system of claim 5, wherein the KVM switch further comprises at least one timer for setting a period of time, the KVM switch is transmitting After the broadcast command or the multicast command is issued, whether the state is abnormal may be determined according to the period of time set by the timer and the state of the controlled computer. The management system of claim 6, wherein the KVM switch issues a warning to a user according to whether the detected state is abnormal. The management system of claim 1, wherein the KVM switch further comprises a network interface for electrically connecting the central control device through a network. The management system of claim 1, wherein the KVM switch further comprises a central control module for electrically connecting the central control device to the KVM switch. A management system for electrically connecting a central control device to at least one controlled computer, the management system comprising: at least one KVM switch electrically connected to the central control device; and an adapter for One of the controlled computers is electrically connected to the KVM switch, and the adapter further comprises: a casing; a universal serial bus (USB) interface for electrically connecting one of the controlled computers to the USB And a video conversion unit disposed in the housing for converting a single-ended video signal outputted by the controlled computer to a differential video signal, and transmitting the differential video signal to the multi-computer switch a USB device controller is disposed in the housing, and communicates with the USB host controller of the controlled computer via the USB interface, wherein the KVM switch is received by the USB device controller according to the One USB request command of the USB host controller detects the state of one of the controlled computers. The management system of claim 10, wherein the adapter further The method includes: an image interface for receiving the single-ended image signal; and an RJ-45 interface for outputting the differential image signal to the KVM switch. The management system of claim 10, wherein the KVM switch and the adapter are connected by a CAT-5 cable. The management system of claim 10, wherein the KVM switch further comprises an image compensation unit for compensating for the quality of the differential image signal transmitted by the adapter. The management system of claim 10, wherein the KVM switch can issue a reconnection command to the adapter, so that the adapter re- enumerates the controlled computer to detect the Control the state of the computer. The management system of claim 10, wherein the USB request instruction is selected from a group consisting of a Set_Configuration request instruction, a Set_Protocol request instruction, and a Set_Feature request instruction. . The management system of claim 10, wherein the state selection is selected from the group consisting of a basic input/output system (BIOS) state, an operating system state, a sleep state, and a shutdown state. The management system of claim 10, wherein the KVM switch sends a broadcast command or a multicast command to the controlled computer according to the detected state to change the state of the controlled computer. . The management system of claim 17, wherein the KVM switch further comprises at least one timer for setting a period of time, the KVM switch after issuing the broadcast command or the multicast command It can be judged whether the state is abnormal according to the period of time set by the timer and the state of the controlled computer. The management system of claim 18, wherein the KVM switch issues a warning to a user according to whether the detected state is abnormal. The management system of claim 10, wherein the KVM switch further comprises a network interface for electrically connecting the central control device through a network. The management system of claim 10, wherein the KVM switch further comprises a central control module for electrically connecting the central control device to the KVM switch. A method for detecting at least one state of a controlled computer, the method being implemented in a remote management system, the remote management system comprising a remote management device and at least one adapter, the method comprising the steps of: An adapter electrically connecting the remote management device to the at least one controlled computer; performing a universal serial bus (USB) enumeration action on each controlled computer by the at least one adapter; and enumerating actions according to the USB Receiving a USB request command from one of the at least one controlled computer to determine a state of the at least one controlled computer. The method of claim 22, further comprising transmitting a reconnect command to the at least one adapter to re-observe the state of the at least one controlled computer. The method of claim 22, wherein the state is one of a basic input/output system (BIOS) state and an operating system state. The method of claim 22, wherein the USB request instruction is at least one of a Set_Configuration request instruction and a Set_Protocol request instruction. The method of claim 25, wherein the step of determining the state of the at least one controlled computer further comprises: If the setting configuration request instruction and the setting agreement request instruction are received, determining that the at least one controlled computer is in a BIOS state; if only the setting configuration request instruction is received, determining that the at least one controlled computer is in an operating system state; And if the setting configuration request instruction and the setting agreement request instruction are received, and the wValue field value in the setting agreement request instruction is 1, determining that the at least one controlled computer is in a working system state. The method of claim 22, further comprising the step of: generating a user interface based on the determined state. The method of claim 22, further comprising the step of: classifying the at least one controlled computer into one or more groups according to the determined state of the at least one controlled computer. The method of claim 28, further comprising the steps of: issuing an instruction to change a controlled computer of a group of the one or more groups according to the one or more groups that are distinguished; status. The method of claim 29, further comprising the step of: alerting a user of the remote management device according to the changed state. A method for detecting at least one state of a controlled computer, the method being implemented in a remote management system, the remote management system comprising a remote management device and at least one adapter, the method comprising at least the following steps: The at least one adapter electrically connects the remote management device to the at least one controlled computer; and the at least one adapter performs an action of checking the command on the at least one controlled computer; determining the at least one according to the action A state of the computer being controlled. The method of claim 31, wherein the state is one of a sleep state and a shutdown state. The method of claim 31, wherein the adapter receives a set state (Set_Feature) request command transmitted by the controlled computer, and if the set state request command includes a state If the value of the selected unit field is 1, it is judged that the controlled computer is in the sleep state. The method of claim 33, wherein after the controlled computer leaves the sleep state, a Clear_Feature request command is transmitted to the adapter. The method of claim 31, wherein the adapter does not receive a Set_Feature request command transmitted by the controlled computer, and if it is set according to a timer If the zero endpoint of the adapter does not receive a polling command within a preset time, it is determined that the controlled computer is in a shutdown state. The method of claim 31, further comprising the step of: generating a user interface based on the determined state. The method of claim 31, further comprising the step of: classifying the at least one controlled computer into one or more groups according to the determined state of the at least one controlled computer. The method of claim 37, further comprising the step of: issuing an instruction to change a controlled computer of a group of the one or more groups according to the one or more groups that are distinguished; status. The method of claim 31, further comprising the step of: alerting a user of the remote management device according to the changed state.