3.2.2 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.
If the shield is tied to ground at the Host, then leave it floating at the CBX. If it is floating at
the Host then tie it to Shield at the CBX.
The CBX pinout follows:
For applications that do not use RX485 signals, do not leave these lines
floating but connect them to SGND as shown below.
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