Communication circuit, communication control method, circuit board and air conditioning system

Abstract

The invention discloses a communication circuit, a communication control method, a circuit board and an air-conditioning system. The communication circuit includes a first communication node, a second communication node and a voltage dividing component, and the first communication node includes a first control chip and a first communication node. A communication chip, the second communication node includes a second control chip and a second communication chip, the first communication node and the second communication node perform RS-485 communication through the first communication chip and the second communication chip, wherein the first control chip is set There is a detection port for detecting the level signal of the first output port of the first communication chip, and the voltage divider component makes the voltage of the first signal line greater than that of the second signal line in the idle state, according to the level signal of the first output port. Compared with the passive waiting method, the accuracy of determining the connection polarity between the first communication chip and the second communication chip can quickly determine the accuracy of the connection polarity between the first communication node and the second communication node, and improve communication efficiency.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a communication circuit, a communication control method, a circuit board, an air conditioning system and a storage medium. Background technique [0002] 485 communication is one of the commonly used communication methods. The 485 communication interface is generally divided into A-line interface and B-line interface. It can only be realized when the communication polarity of the two communication nodes is the corresponding connection of the A-line interface and the corresponding connection of the B-line interface. Normal communication. If the communication polarity of the two communication nodes is inaccurate, the prior art scheme will use a passive waiting method to judge the accuracy of the connection polarity, that is, the slave node needs to wait for a period of time and still does not receive data before it considers the connection polarity to be extremely accu...

AI Technical Summary

Problems solved by technology

If the communication polarity of the two communication nodes is inaccurate, the prior art scheme will use a passive waiting method to judge the accuracy of the connection polarity, that is, the slave node needs to wait for a period of time and still does not receive data before it considers the connection polarity to be extremely accurate. Sexual errors, reducing the efficiency of communication

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