A high-isolation direct-parallel half-duplex communication interface module for multi-controller interconnection

Abstract

The invention relates to the field of serial communication, and provides a high-isolation direct splicing half-duplex communication interface module for the interconnection of multiple controllers. The high-isolation direct splicing half-duplex communication interface module comprises an output end RX (Receive), an input end TX (Transmit), a ground wire AGND (Analog Ground wire) of a control circuit, an isolated communication signal wire DIO (Data Input-Output), an isolated signal power wire V plus, an isolated signal ground wire GND (Ground wire), an isolation optical coupler OC1 (Optical Coupler 1) and an isolation optical coupler OC2 (Optical Coupler 2), wherein the output end RX outputs level signals TTL (Transistor-Transistor Logic level) to the outside; the input end TX receives the external level signals TTL; the isolation optical coupler OC1 outputs signals to the outside; and the isolation optical coupler OC2 receives the external signals. The high-isolation direct splicing half-duplex communication interface module is used for building up a relatively economic communication platform with high transmission rate, and the platform has the advantages of long transmission distance, local multi-point communication network construction, high isolation, direct splicing, low cost and the like at the same time.

Description

technical field [0001] The invention relates to the field of serial communication, in particular to a high-isolation direct parallel connection half-duplex communication interface module for multi-controller interconnection. Background technique [0002] With the application of multi-computer systems and the development of computer networks, communication functions are becoming more and more important. Serial data communication can form a bus-type communication network, thus connecting multiple control systems into a distributed data acquisition and control system. [0003] RS-485 is a typical two-way, half-duplex communication protocol, which meets the requirements of a real multi-point communication network. Due to its excellent performance, simple structure, and easy networking, it can save signal lines when multi-station interconnection, which is convenient for high-speed and long-distance transmission. [0004] While RS-485 has the above advantages, it also has some di...

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Problems solved by technology

[0004] While RS-485 has the above advantages, it also has some disadvantages. For example, RS-485 transmission requires two terminal resistors. If the terminal resistors are missing, the communication will be unreliable; RS-485 differential link transmission cannot use the parallel connection method. The field wiring method is limited; the maximum number of RS-485 connected devices is 32; the RS-485 isolation voltage is only 1500VDC

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