7.2.2 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 (maximum of 1200 m / 3940 ft) than those acceptable for RS232 communications or in
electrically noisy environments.
The following pins are used for RS485 connection.
TCNM-ACBB1
Function
TX+
RS485 Transmit Data +
RX+
RS485 Receive Data +
TX–
RS485 Transmit Data –
RX–
RS485 Receive Data –
SGND
Signal Ground
SGND
RX485- TX485-
USER INTERFACE
SGND TX+
RX+
TX-
RX-
SCANNER
NOTE: For applications that do not use RX485 signals, do not leave these lines floating but connect
them to SGND as shown below.
SGND
RX485-
USER INTERFACE
SGND TX+
TX-
SCANNER
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