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Wiring Description 232 end:R and T:RS232 bus receive and transmit, and other RS232 module connection needs to cross and, that is, RX connected to TX. G is the ground of 232 terminal, connect to external negative pole. V:Positive terminal of module's power supply, connect to the positive terminal of external power supply. 485 terminal: A and B: RS485 bus DATA + (A) and DATA - (B), 485 need to A to A, B to B; G:RS485 reference ground, generally can be left unconnected.