RS485 communication interface hardware circuit diagram

KT2520K26000DCW28QAS import spot

MOSFET imported original FET

In order to realize long-distance communication between the bottom multi-acquisition module and the host computer, the RS 485 bus is used for data transmission on the bottom layer. Since the serial port of the PC terminal is the RS 232 interface, it is necessary to connect the dedicated RS 232/RS 485 conversion module to convert the RS 232 signal into the RS 485 signal on the PC end. The acquisition unit uses the communication module chip as the ADM2483 with magnetic isolation, and adopts the industry standard protocol - MODBUS RTU communication protocol. The picture shows the RS 485 communication interface hardware circuit.