Rs485 Full-Duplex Interface - Datalogic STS400 Installation Manual

ELECTRICAL CONNECTIONS

3.5.2 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:
CBX500 ATS
TX+
RX+
TX-
RX-
SGND
NOTE: For applications that do not use RX485 signals, do not leave these
lines floating but connect them to SGND as shown below.
Figure 10 - RS485 Full-duplex Connections using Only TX Signals
Function
RS485 Transmit Data +
RS485 Receive Data +
RS485 Transmit Data -
RS485 Receive Data -
Signal Ground
SGND
SGND TX+
READER
Figure 9 - RS485 Full-duplex Connections
SGND
READER SGND TX+
USER INTERFACE
RX485+ TX485+
RX485- TX485-
RX+
TX- RX-
USER INTERFACE
RX485+
RX485-
TX-
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