CN107340812B

CN107340812B - Graphic display device of fire control room

Info

Publication number: CN107340812B
Application number: CN201710748572.1A
Authority: CN
Inventors: 陶章亮; 林素欧; 刘真强; 聂和东; 吴金海
Original assignee: Zhejiang Aide Intelligent Technology Co ltd
Current assignee: Zhejiang Aide Intelligent Technology Co ltd
Priority date: 2017-08-28
Filing date: 2017-08-28
Publication date: 2023-05-26
Anticipated expiration: 2037-08-28
Also published as: CN107340812A

Abstract

The invention discloses a graphic display device of a fire control room, which comprises a shell and an all-in-one computer arranged in the shell, wherein the all-in-one computer is provided with a communication interface card for realizing communication with a fire control linkage controller, and the communication interface card comprises a USB module, a central processing unit module, an isolation communication interface module and a state indication module; the touch computer integrated machine is combined with the special shell, so that the connection of external equipment such as a host, a display, a mouse and a keyboard is avoided, the occupied space of the device is reduced, the whole device is attractive and elegant, the communication interface card which is independently designed is installed, the information transmission capacity and the stability are improved, the expansion capacity is improved, and the whole device is superior to the existing products of the same type in appearance and performance.

Description

Graphic display device of fire control room

Technical Field

The invention relates to the field of fire control, in particular to a graphic display device of a fire control room.

Background

The following description is given of the background of the invention, but these descriptions do not necessarily constitute the prior art of the invention.

The fire control system is a system device for starting various fire-fighting equipment in a linkage way after confirming the occurrence of fire so as to achieve the functions of alarming and extinguishing the fire; the graphic display device of the fire control room is applied to the fire control system, and is required to assist in displaying alarm information in the fire control room due to the limitations of screen size, processing speed, operation convenience and the like of the fire alarm controller.

The graphic display device of the fire control room adopts a common home computer, a host computer and a display of the common home computer are separated, the whole occupied space of the device is overlarge, and the interface protection capability is limited; however, the adoption of the industrial computer can avoid the defects, but the price is high and the cost performance is low.

In the aspect of communication with the fire-fighting linkage controller, the common home computer and the industrial computer adopt a communication mode of directly using an RS-232 serial port with the common home computer and the industrial computer, the communication mode adopts TTL level, an interface chip is easy to damage, the communication distance is only 50 meters away, the transmission speed is only 20Kbps, the anti-interference capability is too low, the single station access capability is only, and the function expandability is poor.

Disclosure of Invention

The invention aims to provide a graphic display device of a fire control room, which is arranged in a fire control system, so that the device has simple integral structure installation, excellent performance and high cost performance; and the communication interface card is also provided for anti-interference capability and expansibility, so that the communication interface board is ensured to have strong performance and stable signal transmission.

In order to solve the technical problems, the invention is realized by the following technical scheme: the fire control room graphic display device comprises a shell and an all-in-one computer arranged in the shell, wherein the all-in-one computer is provided with a communication interface card for realizing communication with a fire control linkage controller, and the communication interface card comprises a USB module, a central processing unit module, an isolation communication interface module and a state indication module;

the USB module comprises a USB power supply module and a USB communication module; the USB communication module is arranged between the central processing unit module and the all-in-one computer and used for realizing data transmission communication, and the USB power supply module is also arranged between the central processing unit module and the all-in-one computer and used for converting the power supply of the all-in-one computer to the central processing unit module, the isolation communication interface module and the state indication module;

the central processing unit module is respectively connected with the USB module, the isolated communication interface module and the state indication module; the system is used for detecting and receiving information to judge, analyze and process, and realizes the functions of synchronizing the information with the fire-fighting linkage controller, remotely transmitting the information and receiving remote inquiry;

the isolation communication interface module is arranged between the central processing unit module and the fire-fighting linkage controller, adopts a CAN interface mode and an RS485 interface to realize synchronous communication between the central processing unit module and the fire-fighting linkage controller, and is provided with isolation filtering protection;

the state indication module is connected with the central processing unit module and used for carrying out state indication.

Preferably, the USB power supply module comprises a conversion circuit and a low-dropout voltage regulator circuit; the conversion circuit comprises a USB interface, a single-output DC/DC power module, a third transient suppression diode, a first capacitor and a second capacitor; the first pin of the USB interface and the second pin of the single-output DC/DC power supply module are connected with a VCC power supply, and the fourth pin of the USB interface and the first pin of the single-output DC/DC power supply module are connected with GND; the second pin and the third pin of the USB interface are connected to the USB communication module; the first pin of the USB connector is also connected with the cathode of a third transient suppression diode, the cathode of the third transient suppression diode is also connected with one end of a first capacitor, and the anode of the third transient suppression diode and the other end of the first capacitor are both grounded; the third pin of the single-output DC/DC power supply module is connected with one end of the second capacitor and is also connected with zero potential GNE, and the fourth pin of the single-output DC/DC power supply module is connected with the other end of the second capacitor and is also connected with a VCC1 power supply.

Preferably, the low dropout voltage regulator circuit includes the steady voltage chip, the first pin of steady voltage chip is connected with the one end of third electric capacity, the one end of third electric capacity still is connected with the VCC power and is used for the input, the second pin of steady voltage chip connects GND, the one end of first resistance is connected to the third pin of steady voltage chip, the VCC power is connected to the other end of first resistance, the one end of fourth electric capacity is connected to the fourth pin of steady voltage chip, the other end ground connection of fourth electric capacity, the one end of fifth electric capacity is connected to the fifth pin of steady voltage chip, the other end ground connection of fifth electric capacity, V3.3 power is used for the output is connected to the one end of fifth electric capacity.

Preferably, the central processing unit module adopts an ARM-based 32-bit microcontroller with the model of STM32101RCT6, and has 51 programmable I/O ports, program Flash Memory KB and RAMsize32K.

Preferably, the isolation communication interface module comprises at least one CAN communication interface circuit, at least one RS485 interface circuit and an isolation filter protection circuit.

Preferably, the CAN communication interface circuit comprises a CAN controller chip, a first crystal oscillator, a second resistor, a sixth resistor, a seventh resistor, an eighth resistor and a first light-emitting diode; the first to sixth pins, the sixteenth to seventeenth pins and the twenty third to twenty eighth pins of the CAN controller chip are all connected to the central processing unit module, the seventh and fourteenth pins of the CAN controller chip are suspended, the eighth, fifteenth and twenty first pins of the CAN controller chip are all connected with GND, the twelfth, eighteenth and twenty second pins of the CAN controller chip are mutually connected and connected to one end of a sixth capacitor, one end of the sixth capacitor is also connected with a VCC power supply, the other end of the sixth capacitor is grounded, the ninth pin of the CAN controller chip is connected with one end of a first crystal oscillator, the tenth pin of the CAN controller chip is connected with the other end of the first crystal oscillator, one end of the first crystal oscillator is also connected with one end of a seventh capacitor, the other end of the first crystal oscillator is connected with one end of an eighth capacitor, and the other ends of the seventh capacitor and the eighth capacitor are grounded; an eleventh pin of the CAN controller chip is connected with a VCC power supply, a thirteenth pin of the CAN controller chip is connected with one end of a second resistor, the other end of the second resistor is also connected with a cathode of a first light-emitting diode, and an anode of the first light-emitting diode is connected with the VCC power supply; thirteenth, nineteenth and twenty pins of the CAN controller chip are all connected to a CAN communication interface.

Preferably, the CAN communication interface circuit further includes an interface chip, a first pin of the interface chip is connected with a thirteenth pin of the CAN controller chip, a fourth pin of the interface chip is connected with a nineteenth pin of the CAN controller chip, and a fifth pin of the interface chip is connected with a twentieth pin of the CAN controller chip; the second pin of the interface chip is connected with the other end of the third resistor, the eighth pin of the interface chip is connected with one end of the third resistor, and the other end of the third resistor is grounded; the third pin of the interface chip is connected with one end of a ninth capacitor, the other end of the ninth capacitor is grounded, one end of the ninth capacitor is further connected with a VCC power supply, the sixth pin of the interface chip is connected with the negative electrode of a first transient suppression diode, the seventh pin of the interface chip is connected with the negative electrode of a second transient suppression diode, the positive electrodes of the first transient suppression diode and the second transient suppression diode are both grounded, the negative electrode of the first transient suppression diode is further connected with the other end of a fourth resistor, the negative electrode of the second transient suppression diode is further connected with one end of the fourth resistor, one end of the fourth resistor is further connected with one end of a fifth resistor, the other end of the fourth resistor is further connected with the other end of the fifth resistor, one end of the fifth resistor is further connected with the first end of a jumper terminal, and the other end of the fifth resistor (R5) is further connected with the second end of the jumper terminal.

Preferably, the first transient suppression diode and the second transient suppression diode are combined to form a protection circuit, and each CAN communication interface is provided with a protection circuit.

Preferably, the isolation filtering protection circuit comprises five optocoupler isolation circuits; the circuit comprises a first optocoupler, a second optocoupler, a third optocoupler, a fourth optocoupler, a fifth optocoupler, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor; the first pin of the fifth optocoupler is connected with one end of a fourteenth resistor, the other end of the fourteenth resistor is connected with a VCC1 power supply, the second pin of the fifth optocoupler is connected to an RS485 interface circuit, the third pin of the fifth optocoupler is connected with GND, the fourth pin of the fifth optocoupler is connected with one end of the fifteenth resistor, the other end of the fifteenth resistor is connected with the VCC power supply, and one end of the fifteenth resistor is also connected to an isolated input end of the USB; the first pin of the fourth optical coupler is connected with one end of a twelfth resistor, the other end of the twelfth resistor is connected with a VCC power supply, the second pin of the fourth optical coupler is connected to the central processing unit module, the third pin of the fourth optical coupler is connected with a zero potential GNE, the fourth pin of the fourth optical coupler is connected with one end of a thirteenth resistor, the other end of the thirteenth resistor is connected with a VCC1 power supply, and one end of the thirteenth resistor is also connected with an RS485 interface; the first pin of the third optocoupler is connected with one end of a tenth resistor, the other end of the tenth resistor is connected with a VCC1 power supply, the second pin of the third optocoupler is connected with an isolated input end of RS485, the third pin of the third optocoupler is connected with GND, the fourth pin of the third optocoupler is connected with one end of an eleventh resistor, the other end of the eleventh resistor is connected with the VCC power supply, and one end of the eleventh resistor is also connected with the central processing unit module; the first pin of the second optocoupler is connected with one end of a ninth resistor, the other end of the ninth resistor is connected with a VCC power supply, the second pin of the second optocoupler is connected with a central processing unit module, the third pin of the second optocoupler is connected with a zero potential GNE, the fourth pin of the second optocoupler is connected with one end of an eighth resistor, the other end of the eighth resistor is connected with a VCC1 power supply, and one end of the eighth resistor is also connected with an RS485 interface circuit; the first pin of the first optocoupler is connected with one end of a seventh resistor, the other end of the seventh resistor is connected with a VCC power supply, the second pin of the first optocoupler is connected with a central processing unit module, the third pin of the first optocoupler is connected with a zero potential GNE, the fourth pin of the first optocoupler is connected with one end of a sixth resistor, the other end of the sixth resistor is connected with a VCC1 power supply, and one end of the sixth resistor is also connected with an RS485 interface circuit.

Preferably, the status indication module comprises a plurality of double-color LED indication lamps, and the series resistor of the double-color LED indication lamps is directly connected with the central processing unit module.

The fire-fighting integrated controller comprises a shell and an integrated computer arranged in the shell, wherein the integrated computer is provided with a communication interface card for realizing communication with the fire-fighting integrated controller, and the communication interface card comprises a USB module, a central processing unit module, an isolated communication interface module and a state indication module; the touch computer integrated machine is combined with the special shell, so that the connection of external equipment such as a host, a display, a mouse and a keyboard is avoided, the occupied space of the device is reduced, the whole device is attractive and elegant, the communication interface card which is independently designed is installed, the information transmission capacity and the stability are improved, the expansion capacity is improved, and the whole device is superior to the existing products of the same type in appearance and performance.

Compared with the prior art, the invention has the following advantages: 1) The touch computer integrated machine is arranged in the shell, so that other accessories are reduced, the occupied space of the device is reduced, and the cost is saved; 2) The communication interface card communicates with the CAN field bus through RS485, and combines electrical isolation protection to improve the electromagnetic interference resistance; 3) The communication stability and the communication distance are improved, and the access information capacity is large; 4) Modular functional extensions can be provided; 5) The stability and the functionality of the signal transmission of the communication interface card are ensured by the two voltage stabilizing circuits and the five optical coupling isolation circuits; 6) The common mode interference resistance and the noise interference resistance are improved; 7) The communication transmission capability is improved, an automatic error detection mechanism is provided, the stability of data transmission is ensured, and the error CAN node CAN be automatically isolated.

Drawings

The features and advantages of the present invention will become more readily appreciated from the following detailed description of the invention provided with reference to the accompanying drawings, in which.

Fig. 1 is a block diagram of a communication interface card of the graphic display device of the fire control room of the present invention.

Fig. 2 is a circuit diagram of a USB power module of the communication interface card of the present invention.

Fig. 3 is a circuit diagram of a CAN communication interface circuit of the communication interface card of the present invention.

Fig. 4 is a circuit diagram of an isolation filter protection circuit of a communication interface card according to the present invention.

FIG. 5 is a block diagram of an isolated input of a USB of the communication interface card of the present invention.

Fig. 6 is an isolated input of RS485 of the communication interface card of the invention.

Detailed Description

Exemplary embodiments of the present invention will be described in detail below with reference to the attached drawings; the description of the exemplary embodiments is presented for purposes of illustration only and is in no way intended to limit the invention, its application, or uses.

In the embodiment, the fifth optocoupler UP5 realizes the isolation between the isolation input end of the USB and the RS485 interface circuit; the fourth optocoupler UP4 realizes the isolation between the RS485 interface circuit and the central processing unit module; the third optocoupler UP3 realizes the isolation of the central processing unit module and the isolation input end of the RS 485; the second optocoupler UP2 realizes the isolation between the RS485 interface circuit and the central processing unit module; the first optocoupler UP1 realizes isolation between the RS485 interface circuit and the central processing unit module; the central processing unit module and other interface control chips form a signal transmission circuit through a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a twelfth resistor R12 and a fourteenth resistor R14, and realize optical coupling isolation and prevent interference; the isolated input end of the USB is used for isolating output of the graphic device, and the isolated input end of the RS485 is used for input of a user.

In this embodiment, the communication interface card is directly connected with the computer of the integrated machine arranged in the shell through the USB power supply module, and directly uses the USB power supply of the computer; the USB power supply of the computer is used as 5V power supply input, is filtered by a third transient suppression diode TVS3 and a first capacitor C1, is converted into stable DC5V and DC3.3V by a single-output DC/DC power supply module IC1 and a low-dropout voltage stabilizing circuit respectively, and is supplied to the USB module, the central processing unit module, the isolation communication interface module and the state indicating module for power utilization.

In this embodiment, the central processing unit module adopts an ARM-based 32-bit microcontroller with a model number of STM32101RCT6, and has 51 programmable I/O ports, program Flash Memory KB, and ram size32K. The singlechip judges, analyzes and processes the detected and received information of each path of controller, and realizes the functions of synchronizing the information with the fire-fighting linkage controller, remotely transmitting the information and receiving remote inquiry.

In this embodiment, the isolated communication interface module includes two CAN communication interface circuits and an RS485 interface circuit, where the CAN communication interface circuits are controlled by an independent CAN control chip IC3 and an independent interface chip IC4, and the RS485 interface circuit is controlled by an independent RS485 control chip.

In this embodiment, each CAN communication interface circuit is provided with a protection circuit including two transient suppression diodes, for protecting the safety of the CAN communication interface circuit.

In this embodiment, the status indication module includes four dual-color LED indicator lamps, which are all connected in series with resistors directly to the central processing unit module, for implementing status indication.

In the embodiment, compared with the RS-232 communication mode in the prior art, the invention adopts an RS-485 communication interface, has a wider range of working level, realizes better protection on the interface chip, and has the highest transmission rate of 10Mbps which is 500 times of the RS-232 rate; the combination of the balance driver and the differential receiver is adopted, so that the common-mode interference resistance is improved, namely, the noise interference resistance is good; the maximum transmission distance is up to 3 km and has multi-drop capability that allows for as many as 128 transceivers to be connected on the bus, making the interface more scalable.

In the embodiment, the invention is provided with two CAN interfaces which are main communication interfaces of the device, are stronger than an RS-485 interface in the aspect of communication transmission capacity, are industrial field buses of international standards, and have high instantaneity; the multi-master working mode is adopted, and the nodes without quantity limitation are theoretically possessed, so that local networking is conveniently formed; the message is of a short frame structure and has hardware CRC check, and an automatic error detection mechanism is provided to ensure the stability of data transmission; the error CAN nodes are automatically isolated, and the communication function of the bus is not affected; the system has simple structure and high cost performance.

In the embodiment, the touch computer integrated machine is combined with the special shell, so that the connection of external equipment such as a host, a display, a mouse and a keyboard is avoided, the occupied space of the device is reduced, and the whole device is attractive and elegant; and install the communication interface card of independent design, it directly uses the computer USB power, possess 2 way CAN, 1 way RS-485 information input interface, adopt 32 bit microcontroller STM32101RCT6 based on ARM, two place power voltage stabilizing circuit, five way opto-couplers keep apart, guarantee that the communication interface board possess powerful performance and stable signal transmission, promote information transmission ability and stability moreover, increase the expansion ability, make the device whole in outward appearance and performance all superior than present same type product.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the particular embodiments described and illustrated herein, and that various changes, modifications, and improvements may be made to the exemplary embodiments by those skilled in the art without departing from the scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a fire control room graphic display device, includes the casing and sets up the all-in-one computer in the casing, the all-in-one computer is provided with communication interface card and is used for realizing the communication with fire control coordinated controller, its characterized in that: the communication interface card comprises a USB module, a central processing unit module, an isolated communication interface module and a state indication module; the USB module comprises a USB power supply module and a USB communication module; the USB communication module is arranged between the central processing unit module and the all-in-one computer and used for realizing data transmission communication, and the USB power supply module is also arranged between the central processing unit module and the all-in-one computer and used for converting the power supply of the all-in-one computer to the central processing unit module, the isolation communication interface module and the state indication module; the central processing unit module is respectively connected with the USB module, the isolated communication interface module and the state indication module; the system is used for detecting and receiving information to judge, analyze and process, and realizes the functions of synchronizing the information with the fire-fighting linkage controller, remotely transmitting the information and receiving remote inquiry; the isolation communication interface module is arranged between the central processing unit module and the fire-fighting linkage controller, adopts a CAN interface mode and an RS485 interface to realize synchronous communication between the central processing unit module and the fire-fighting linkage controller, and is provided with isolation filtering protection; the USB power supply module comprises a conversion circuit and a low-voltage-difference voltage stabilizing circuit; the conversion circuit comprises a USB connection port (X9), a single-output DC/DC power module (IC 1), a third transient suppression diode (TVS 3), a first capacitor (C1) and a second capacitor; the first pin of the USB connector (X9) and the second pin of the single-output DC/DC power supply module (IC 1) are connected with a VCC power supply, and the fourth pin of the USB connector (X9) and the first pin of the single-output DC/DC power supply module (IC 1) are connected with GND; the second pin and the third pin of the USB connector (X9) are connected to a USB communication module; the first pin of the USB connector (X9) is also connected with the cathode of a third transient suppression diode (TVS 3), the cathode of the third transient suppression diode (TVS 3) is also connected with one end of a first capacitor (C1), and the anode of the third transient suppression diode (TVS 3) and the other end of the first capacitor (C1) are grounded; the third pin of the single-output DC/DC power supply module (IC 1) is connected with one end of a second capacitor (C2) and is also connected with zero potential GNE, the fourth pin of the single-output DC/DC power supply module (IC 1) is connected with the other end of the second capacitor (C2) and is also connected with VCC1 power supply, the low-voltage difference voltage stabilizing circuit comprises a voltage stabilizing chip (IC 2), the model of the voltage stabilizing chip is CAT6219-330TDGT3, the first pin of the voltage stabilizing chip (IC 2) is connected with one end of the third capacitor (C3), one end of the third capacitor (C3) is also connected with VCC power supply for input, the second pin of the voltage stabilizing chip (IC 2) is connected with GND, the third pin of the voltage stabilizing chip (IC 2) is connected with one end of a first resistor (R1), the other end of the first resistor (R1) is connected with a VCC power supply, a fourth pin of the voltage stabilizing chip (IC 2) is connected with one end of a fourth capacitor (C4), the other end of the fourth capacitor (C4) is grounded, a fifth pin of the voltage stabilizing chip (IC 2) is connected with one end of a fifth capacitor (C5), the other end of the fifth capacitor (C5) is grounded, one end of the fifth capacitor (C5) is connected with a V3.3 power supply for output, the central processing operation unit module adopts an ARM-based 32-bit microcontroller with the model of STM32101RCT6, 51 programmable I/O ports Program Flash Memory KB and RAMsize32K are arranged, the isolation communication interface module comprises at least one CAN communication interface circuit and at least one RS485 interface circuit, the CAN communication interface circuit comprises a CAN controller chip (IC 3), a first crystal oscillator (B1), a second resistor (R2), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8) and a first light-emitting diode (LED 0); the first to sixth pins, sixteenth to seventeenth pins and twenty third to twenty eighth pins of the CAN controller chip (IC 3) are all connected to the central processing unit module, the seventh and fourteenth pins of the CAN controller chip (IC 3) are suspended, the eighth, fifteenth and twenty first pins of the CAN controller chip (IC 3) are all connected with GND, the twelfth, eighteenth and twenty second pins of the CAN controller chip (IC 3) are mutually connected and connected to one end of a sixth capacitor (C6), one end of the sixth capacitor (C6) is also connected with a VCC power supply, the other end of the sixth capacitor (C6) is grounded, the ninth pin of the CAN controller chip (IC 3) is connected with one end of a first crystal oscillator (B1), one end of the first crystal oscillator (B1) is also connected with one end of a seventh capacitor (C7), and the other end of the first crystal oscillator (B1) is connected with the first end of the eighth capacitor (C8) and the eighth end of the eighth capacitor (C8); an eleventh pin of the CAN controller chip (IC 3) is connected with a VCC power supply, a thirteenth pin of the CAN controller chip (IC 3) is connected with one end of a second resistor (R2), the other end of the second resistor (R2) is also connected with the cathode of a first light-emitting diode (LED 0), and the anode of the first light-emitting diode (LED 0) is connected with the VCC power supply; thirteenth, nineteenth and twenty pins of the CAN controller chip (IC 3) are all connected to a CAN communication interface.

2. The apparatus according to claim 1, wherein: the CAN communication interface circuit further comprises an interface chip (IC 4), wherein a first pin of the interface chip (IC 4) is connected with a thirteenth pin of the CAN controller chip (IC 3), a fourth pin of the interface chip (IC 4) is connected with a nineteenth pin of the CAN controller chip (IC 3), and a fifth pin of the interface chip (IC 4) is connected with a twentieth pin of the CAN controller chip (IC 3); the second pin of the interface chip (IC 4) is connected with the other end of the third resistor (R3), the eighth pin of the interface chip (IC 4) is connected with one end of the third resistor (R3), and the other end of the third resistor (R3) is grounded; the third pin of interface chip (IC 4) is connected with one end of ninth electric capacity (C9), the other end ground connection of ninth electric capacity (C9), VCC power is still connected to the one end of ninth electric capacity (C9), the negative pole of first transient suppression diode (TVS 1) is connected to the sixth pin of interface chip (IC 4), the negative pole of second transient suppression diode (TVS 2) is connected to the seventh pin of interface chip (IC 4), the positive pole of first transient suppression diode (TVS 1) and second transient suppression diode (TVS 2) all ground connection, the other end of fourth resistance (R4) is still connected to the negative pole of first transient suppression diode (TVS 1), one end of fourth resistance (R4) is still connected to the negative pole of fourth resistance (R4), one end of fifth resistance (R5) is connected to the one end of fifth resistance (R4), the other end of fifth resistance (R5) is still connected to the positive pole of fifth resistance (R5), the other end of fifth resistance (MP 1) is still connected to the other end of fifth resistance (MP 1).

3. The apparatus according to claim 2, wherein: the first transient suppression diode (TVS 1) and the second transient suppression diode (TVS 2) are combined to form a protection circuit, and each CAN communication interface circuit is provided with a protection circuit.

4. A device according to claim 3, characterized in that: the isolation filter protection circuit comprises five optical coupling isolation circuits; the circuit comprises a first optocoupler (UP 1), a second optocoupler (UP 2), a third optocoupler (UP 3), a fourth optocoupler (UP 4), a fifth optocoupler (UP 5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), a tenth resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14) and a fifteenth resistor (R15); the first pin of the fifth optocoupler (UP 5) is connected with one end of a fourteenth resistor (R14), the other end of the fourteenth resistor (R14) is connected with a VCC1 power supply, the second pin of the fifth optocoupler (UP 5) is connected to an RS485 interface circuit, the third pin of the fifth optocoupler (UP 5) is connected with GND, the fourth pin of the fifth optocoupler (UP 5) is connected with one end of a fifteenth resistor (R15), the other end of the fifteenth resistor (R15) is connected with a VCC power supply, and one end of the fifteenth resistor (R15) is also connected to an isolated input end of the USB; the first pin of the fourth optocoupler (UP 4) is connected with one end of a twelfth resistor (R12), the other end of the twelfth resistor (R12) is connected with a VCC power supply, the second pin of the fourth optocoupler (UP 4) is connected to a central processing unit module, the third pin of the fourth optocoupler (UP 4) is connected with a zero potential GNE, the fourth pin of the fourth optocoupler (UP 4) is connected with one end of a thirteenth resistor (R13), the other end of the thirteenth resistor (R13) is connected with a VCC1 power supply, and one end of the thirteenth resistor (R13) is also connected with an RS485 interface; the first pin of the third optocoupler (UP 3) is connected with one end of a tenth resistor (R10), the other end of the tenth resistor (R10) is connected with a VCC1 power supply, the second pin of the third optocoupler (UP 3) is connected with an isolated input end of RS485, the third pin of the third optocoupler (UP 3) is connected with GND, the fourth pin of the third optocoupler (UP 3) is connected with one end of an eleventh resistor (R11), the other end of the eleventh resistor (R11) is connected with a VCC power supply, and one end of the eleventh resistor (R11) is also connected with a central processing operation unit module; the first pin of the second optocoupler (UP 2) is connected with one end of a ninth resistor (R9), the other end of the ninth resistor (R9) is connected with a VCC power supply, the second pin of the second optocoupler (UP 2) is connected with a central processing unit module, the third pin of the second optocoupler (UP 2) is connected with a zero potential GNE, the fourth pin of the second optocoupler (UP 2) is connected with one end of an eighth resistor (R8), the other end of the eighth resistor (R8) is connected with a VCC1 power supply, and one end of the eighth resistor (R8) is also connected with an RS485 interface circuit; the first pin of first opto-coupler (UP 1) is connected with one end of a seventh resistor (R7), the other end of the seventh resistor (R7) is connected with a VCC power supply, the second pin of first opto-coupler (UP 1) is connected with a central processing unit module, the third pin of first opto-coupler (UP 1) is connected with a zero potential GNE, the fourth pin of first opto-coupler (UP 1) is connected with one end of a sixth resistor (R6), the other end of the sixth resistor (R6) is connected with a VCC1 power supply, and one end of the sixth resistor (R6) is also connected with an RS485 interface circuit.

5. The apparatus according to claim 4, wherein: the state indicating module comprises a plurality of double-color LED indicating lamps, and the series resistor of the double-color LED indicating lamps is directly connected with the central processing unit module.