Rs485 Full-Duplex Interface - Datalogic DS2100N Reference Manual

25-PIN CABLE ELECTRICAL CONNECTIONS

5.2.2 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 connector pinout follows:
25-pin Name
2 TX+
3 RX+
4 TX-
5 RX-
7 GND
For applications that do not use RX signals, do not leave these lines floating
but connect them to GND as shown below.
NOTE
Figure 48 - RS485 Full-duplex Connections using Only TX Signals
Function
RS485 Transmit Data +
RS485 Receive Data +
RS485 Transmit Data -
RS485 Receive Data -
Ground
DS2100N
2
TX+
4 TX-
3 RX+
RX-
5
7
GND
1
Chassis
Figure 47 - RS485 Full-duplex Connections
DS2100N
2
TX+
4 TX-
3
RX+
RX-
5
7
GND
1
Chassis
USER INTERFACE
+
RX485
-
+
TX485
-
GND
USER INTERFACE
+
RX485
-
GND
5
51