
25-PIN CABLE ELECTRICAL CONNECTIONS
5.2.2 RS485 Full-Duplex Interface
The RS485 full-duplex (5 wires + shield) interface is used for non-polled communication
protocols in point-to-point connections over longer distances (max 1200 m / 3940 ft) than
those acceptable for RS232 communications or in electrically noisy environments.
The connector pinout follows:
Figure 65 - RS485 Full-duplex Connections
For applications that do not use RX signals, do not leave these lines floating
but connect them to GND as shown below.
Figure 66 - RS485 Full-duplex Connections using Only TX Signals
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