DS4800 REFERENCE MANUAL
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4
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
