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RS485 character-oriented anti-interference device against idle synchronous serial communication bus

A technology of synchronous serial communication and anti-jamming device, which is applied in the direction of digital transmission system, electrical components, and error prevention. Improve communication efficiency and anti-interference performance, eliminate false reception problems, and eliminate false synchronization effects

Active Publication Date: 2007-05-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method cannot fundamentally remove the interference on the transmission line, and it cannot solve the problem of missynchronization and misreception at the receiving end.

Method used

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  • RS485 character-oriented anti-interference device against idle synchronous serial communication bus
  • RS485 character-oriented anti-interference device against idle synchronous serial communication bus

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The RS485 serial bus interface circuit of the present invention is shown in Figure 4, as the clock signal output by the master device at the sending end, the data signal, the transmission control signal A and B, the four are all TTL levels, and are converted into differential by RS485 interface chip 75175 After the signal is transmitted to the slave device as the receiving end through the twisted pair, the slave device (receiving end) converts the received four-way differential signal into a TTL level signal through the RS485 interface chip 75174, and then takes the transmission control signal A in it Inversely, the signal obtained by ANDing the transmission control signal B and the data signal o'data is received as a data signal of the slave device (receiving end).

[0020] Signals A and B are two additional transmission control signals...

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Abstract

The RS485 orientated-character anti-interference device for free synchronous serial communication bus employs a primary device to send data, a secondary device to receive data, the RS485 standard interface as physical interface, and the synchronous serial communication protocol. This invention adds two path control signal and takes simple logic combination to inhibit error synchronizing and receiving, and thereby improves communication efficiency and anti-interference capacity.

Description

technical field [0001] The invention relates to an anti-jamming device using RS485 character-oriented synchronous serial communication in an industrial control system. Background technique [0002] RS485 is a serial communication interface standard with balanced transmission mode. It adopts the method of balanced transmission and differential reception, which has the characteristics of high transmission rate and long transmission distance. Widely used in communications, aviation, transportation and other fields. [0003] The character-oriented synchronous serial communication protocol is characterized by transmitting a data block composed of several characters at a time, instead of transmitting only one character at a time like asynchronous communication, and specifying several characters as the beginning and end of the data block and the entire transmission process control information. Figure 1 shows the data frame format of the character-oriented synchronous serial comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L29/06
Inventor 张树田葛琼旋王晓新
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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