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RXD
TXD
GND
⑦
RS485 Communication Interface:
Choosing RS485 in the
communication settings interface makes this terminal active.
GD1:
RS485 signal ground
A+:
Connect RS485 A+ terminal
B-:
Connect RS485 B- terminal
Note: No matter whether you choose RS232 or RS485, the communication protocol is
standard MODBUS protocol.