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Communication Gateway - What pins are what on the RS485 (Modbus) Terminal Block? (eg. Rx+, Rx-, Tx+ and correct orientation)

Pin 1 - 15V input
Pin 2 - Ground
Pin 3 - RS485 A
Pin 4 - RS485 B
RS485 is a bidirectional differential bus so there is no transmit and receive. Pin 1 is on the right when looking at the connector. See attached diagram.
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