Datalogic DS6400, Reference Manual, Page: 45 / 159

CBX ELECTRICAL CONNECTIONS
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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:
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 27 - 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 28 - RS485 Full-duplex Connections using Only TX Signals