Installation manual

DS4800 REFERENCE MANUAL

4.2.2 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 CBX pinout follows:

CBX100/500

Function

TX+ RS485 Transmit Data +

RX+ RS485 Receive Data +

TX- RS485 Transmit Data -

RX- RS485 Receive Data -

SGND Signal Ground

RX485+ TX485+

SGND RX485- TX485-

USER INTERFACE

SGND TX+ RX+

TX- RX-

SCANNER

Figure 28 - RS485 Full-duplex Connections

NOTE

For applications that do not use RX485 signals, do not leave these lines

floating but connect them to SGND as shown below.

RX485+

SGND RX485-

USER INTERFACE

SGND TX+

TX-

SCANNER

Figure 29 - RS485 Full-duplex Connections using Only TX Signals