Datasheet

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Appendix
The Terminal Block
The four screw terminal block has different pin assignments
depending on the operating mode:
 In DCE/DTE mode, terminals 1 (+V) and 2 (-V) are configured
to transmit data (the transmitter); while terminals 3 (-V) and 4
(+V) are configured to receive data (the receiver).
 In Monitor mode (IC-485S only), terminals 1 and 2 are,
respectively, the positive and negative of receiver 1; while
terminals 3 and 4 are, respectively, the positive and negative
of receiver 2.
Pin DCE/DTE Monitor
1 Transmitter +V Receiver 1 +V
2 Transmitter -V Receiver 1 -V
3 Receiver -V Receiver 2 -V
4 Receiver +V Receiver 2 +V