CN203193608U

CN203193608U - High isolation direct splice half-duplex communication interface module for interconnection of multiple controllers

Info

Publication number: CN203193608U
Application number: CN 201320144347
Authority: CN
Inventors: 戴强晟; 章萍华; 魏征; 程兰芬; 左文平; 谢睿; 王少荣
Original assignee: SHANGHAI HUAQUN INDUSTRIAL Inc Co Ltd; WUHAN XINHUI ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: SHANGHAI HUAQUN INDUSTRIAL Inc Co Ltd; WUHAN XINHUI ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2013-09-11
Anticipated expiration: 2023-03-27

Abstract

The utility model relates to the field of serial communication, and provides a high isolation direct splice half-duplex communication interface module for interconnection of multiple controllers. The module comprises an output terminal RX outputting TTL level signals, an input terminal TX receiving external TTL level signals, a grounding wire AGND of a control circuit, an isolated communication signal line DIO, an isolated signal power line V+, an isolated signal ground wire GND, an isolated optical coupler OC1 outputting signals, and an isolated optical coupler OC2 receiving external signals. The communication interface module provided by the utility model is used for establishing an economical communication platform with high transmission rate, and has the advantages of long transmission distance, on-site multi-point communication networking, high isolation, direct splice and low cost, etc.

Description

A kind of height for the multi-controller interconnection is isolated direct and is connect the half-duplex operation interface module

Technical field

The utility model relates to the serial communication field, is specifically related to a kind of height for multi-controller interconnection and isolates directly and connect the half-duplex operation interface module.

Background technology

Along with the application of multimicrocomputer and the development of microcomputer network, it is important that communication function more and more seems.Serial data communication can constitute the bus-type communication network, thereby many bench control systems are connected into a distributed data acquisition and control system.

RS-485 is typical two-way, half-duplex operation agreement, meets real multi-point communication network requirement because excellent performance, simple in structure, networking is easy, can save holding wire during the multistation interconnection, be convenient at a high speed, the remote transmission.

RS-485 also comes with some shortcomings when having above advantage, and transmission needs two terminal resistances as RS-485, if miss terminal resistance, it is unreliable then to communicate by letter; The method that RS-485 difference link transmission can not be adopted and connect, the field connection mode is restricted; The maximum access device numbers of RS-485 are 32; The RS-485 isolation voltage has only 1500VDC.

Summary of the invention

The purpose of this utility model is exactly in order to overcome above-mentioned the deficiencies in the prior art part, and provide a kind of height for multi-controller interconnection to isolate directly and connect the half-duplex operation interface module, be used for setting up the communications platform of a relatively economical, high transfer rate, advantages such as having long transmission distance, on-the-spot multi-point networking simultaneously, highly isolate, can directly and connect, be with low cost.

The purpose of this utility model realizes by following technical measures: a kind of height for multi-controller interconnection is isolated directly and is connect the half-duplex operation interface module, this module comprise the signal ground GND of signal power supply line V+, the isolation of signal of communication line DIO, the isolation of ground wire AGND, the isolation of the output RX of outside output Transistor-Transistor Logic level signal, the input TX that receives outside Transistor-Transistor Logic level signal, control circuit, outwards output signal isolation optocoupler OC1 and receive the isolation optocoupler OC2 of external signal;

The isolation optocoupler OC1 of described outside output signal is used for the level signal on the signal of communication line of isolating is handled; The isolation optocoupler OC2 that receives external signal is used for receiving the signal that internal controller sends, and converts the level signal on the signal of communication line of isolation to;

Outwards the collector electrode of the isolation optocoupler OC1 of output signal meets the output RX of outside outputs level signals, the power supply VCC of the base stage connection control circuit of the isolation optocoupler OC1 of outside output signal, the ground wire AGND of the emitter connection control circuit of the isolation optocoupler OC1 of outside output signal, outwards the anode of the light-emitting diode among the isolation optocoupler OC1 of output signal meets the signal power supply line V+ of isolation through current-limiting resistance R1, diode D1 of light-emitting diode reverse parallel connection of the isolation optocoupler OC1 of outside output signal, outwards the negative electrode of the light-emitting diode among the isolation optocoupler OC1 of output signal is connected to the collector electrode of the isolation optocoupler OC2 that receives external signal;

The collector electrode that receives the optocoupler OC2 of external signal meets the signal of communication line DIO of isolation, the emitter that receives the optocoupler OC2 of external signal meets the signal ground GND of isolation, reverse diode D2 and the Transient Suppression Diode T1 of parallel connection between holding wire DIO and the ground wire GND, the anode of the light-emitting diode among the optocoupler OC2 of reception external signal is received the power supply VCC of control circuit, the negative electrode of the light-emitting diode among the optocoupler OC2 of reception external signal is connected to the input TX that receives outside Transistor-Transistor Logic level signal, receives diode D3 of light-emitting diode reverse parallel connection of the optocoupler OC2 of external signal.

In technique scheme, the power supply VCC of described control circuit is direct voltage 5V, perhaps is direct voltage 3.3V, the highest can the arriving+24V of voltage of the signal power supply line V+ of described isolation.

Compared with prior art, the height that is used for the multi-controller interconnection that the utility model provides is isolated directly and is connect the half-duplex operation interface module and has the following advantages:

(1) solved that the serial communication long-distance transmissions needs terminal resistance in the current bus-network, the electric pressure on the transmission line is low, is interfered easily to cause the problem of communication failure, thereby can guarantees proper communication.

(2) guarantee that transmission signal line and this height of control circuit are isolated in communication, protected control circuit itself, have good castering action for the reliability of serial communication.

(3) communication interface modules can return the data of controller oneself transmission after controller whenever sends a secondary data, has guaranteed the correctness of data.

(4) modular structure is simple, and the transmission data wire has only one, and required element is few, and cost is low.

(5) number of External Access Equipment is unrestricted, can directly be attempted by the sending and receiving end of control circuit, and is easy to use.

(6) maximum transmission rate can upwards promote along with the current transfer ratio of the optocoupler of selecting increases.

(7) has the data-interface of isolation.

(8) reach as high as+the signal power source power supply of the isolation of 24V with respect to the signal ground of isolating.

Description of drawings

Fig. 1 isolates directly and connects the circuit connection diagram of half-duplex operation interface module for the height of multi-controller interconnection for the utility model.

Fig. 2 will isolate the line schematic diagram that the half-duplex operation mode intercoms mutually by the height that the utility model provides for a plurality of controllers.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and contribution is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

As shown in Figure 1, present embodiment provides a kind of height for multi-controller interconnection to isolate directly and connects the half-duplex operation interface module, this module comprise the signal ground GND of signal power supply line V+, the isolation of signal of communication line DIO, the isolation of ground wire AGND, the isolation of the output RX of outside output Transistor-Transistor Logic level signal, the input TX that receives outside Transistor-Transistor Logic level signal, control circuit, outwards output signal isolation optocoupler OC1 and receive the isolation optocoupler OC2 of external signal.

In the time of operate as normal, communication line add isolation+5V or+the 24V power supply is between V+ and the GND.The working power that adds control circuit on the VCC, the ground AGND of control circuit and the GND isolator on the communication line can not link together, thereby guarantee to isolate fully.

When controller sent data to optocoupler OC2 from the TX pin, the TX pin was the then light-emitting diode conducting of optocoupler inside of low level, and the collector electrode output low level of optocoupler OC2 is to holding wire DIO; The TX pin is the then not conducting of light-emitting diode of optocoupler inside of high level, and the collector electrode output high level of optocoupler OC2 is to holding wire DIO.

When optocoupler OC1 received data from the signal of communication line DIO that isolates, holding wire DIO was the then light-emitting diode conducting of optocoupler OC1 inside of low level, and the collector electrode output low level of optocoupler is to the RX pin; Holding wire DIO is the then not conducting of light-emitting diode of optocoupler OC1 inside of high level, and the collector electrode output high level of optocoupler OC1 is to the RX pin.

When the holding wire of isolating did not have transfer of data, DIO then was high level always.

When controller sent data to the outside, data can turn back to optocoupler OC1 by holding wire DIO through optocoupler OC2, thus every transmission one secondary data, and controller itself can be received the data that oneself sends, and has guaranteed the correctness of data.

As shown in Figure 2, to isolate the line that the half-duplex operation mode intercoms mutually by the height that the utility model provides for a plurality of controllers.V+, DIO, the GND of communication interface modules IC1, IC2, IC3, IC4 are connected to together, the RX end, TX holds on the controller that is connected respectively to separately.Add the power supply of isolation between V+ and the GND at the communication bus of isolating.

When each communication interface modules sent data, other module of each on bus can be received data, self can receive also that data check.

Claims

1. a height that is used for the multi-controller interconnection is isolated directly and is connect the half-duplex operation interface module, it is characterized in that: this module comprise the signal ground GND of signal power supply line V+, the isolation of signal of communication line DIO, the isolation of ground wire AGND, the isolation of the output RX of outside output Transistor-Transistor Logic level signal, the input TX that receives outside Transistor-Transistor Logic level signal, control circuit, outwards output signal isolation optocoupler OC1 and receive the isolation optocoupler OC2 of external signal;

2. the height for the multi-controller interconnection according to claim 1 is isolated direct and is connect the half-duplex operation interface module, it is characterized in that: the power supply VCC of described control circuit is direct voltage 5V, perhaps be direct voltage 3.3V, the highest can the arriving+24V of voltage of the signal power supply line V+ of described isolation.