Multiple serial communication switching device

Abstract

The invention provides a multi-channel serial communication switching device, which comprises an MCU, a data input switching circuit, a data transceiver control circuit, an RS232 conversion chip U5, RS485 / 422 conversion chips U3 and U4. The multi-channel serial communication switching device comprises a MCU, a data input switching circuit, a data transceiver control circuit, a RS232 conversion chip U5 and a RS485 / 422 conversion chip U3 and U4. Each input terminal of the data input switching circuit is respectively connected with the RXD data output terminal of the RS232 conversion chip U5 andthe RXD data output terminal of the RS485 / 422 conversion chip U3. The RXD data output terminal of the RS232 conversion chip U5 and the RS485 / 422 conversion chip U3 are connected with each other. The output end of the data input switching circuit is connected with the RXD data port of the MCU; MCU realizes the switch of RS232 / RS485 / RS422 serial communication data reception through the control of data input switch circuit. RS485 / 422 conversion chip U3 is used for RS485 serial communication data transmission, U3 is used for RS422 serial communication data reception, RS485 / 422 conversion chip U4 is used for RS422 serial communication data transmission; The MCU realizes the control of RS485 / 422 conversion chip U3, U4 through the control terminal and the data transceiver control circuit. The aircondition is flexible and convenient to use.

Description

technical field [0001] The invention relates to the technical field of industrial communication, in particular to a multi-channel serial port communication switching device. Background technique [0002] In the prior art, multi-channel serial communication RS232, RS485, and RS422 cannot be connected to the circuit and the RXD data port and TXD data port of the MCU at the same time for communication, and the mutual interference is serious when they are connected at the same time, and the data cannot be transmitted normally. The traditional method requires It is inconvenient and cumbersome to manually disconnect and connect each serial port communication line. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a multi-channel serial communication switching device, which can realize automatic switching of multi-channel serial communication, is flexible and convenient to use, and has a simple an...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, multi-channel serial communication RS232, RS485, and RS422 cannot be connected to the circuit and the RXD data port and TXD data port of the MCU at the same time for communication, and the mutual interference is serious when they are connected at the same time, and the data cannot be transmitted normally. The traditional method requires It is inconvenient and cumbersome to manually disconnect and connect each serial communication line

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