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6.2. Wiring Connection to the Modbus Module
Sometimes it is necessary to convert from the standard RS485 to RS232 for connection to a
Personal Computer. The wiring between the Modbus module and the converter must be set
as follows:
RS485 Converter Modbus Module
TXA RXA
RXA TXA
TXB RXB
RXB TXB
SG SG
Note: Different RS485 converters have different connections. For example, when one
commonly available converter is used, TXA connects to RXB, TXB connects to RXA, etc.
Please refer to the converter manufacturer’s instructions.