Rs485 Full-Duplex Interface - Datalogic Compact 2D Reader Matrix-2000 Reference Manual

19-PIN CONNECTOR ELECTRICAL CONNECTIONS

5.5.2 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 following pins of the 25-pin connector are used for RS485 full-duplex communication:
Pin
2
4
3
5
7
Chassis
Earth Ground
For applications that do not use RX485 signals, do not leave these lines
floating but connect them to GND_ISO as shown below.
NOTE
Chassis
Earth Ground
Figure 68 - RS485 Full-duplex Connections using Only TX Signals
Name Function
TX+ RS485 Transmit Data (+)
TX- RS485 Transmit Data (-)
RX+ RS485 Receive Data (+)
RX- RS485 Receive Data (-)
GND_ISO Main opto-isolated reference ground
MATRIX
2
TX+
4
TX-
3
RX+
5
RX-
7
GND_ISO
1
SHIELD
Figure 67 - RS485 Full-duplex Connections
MATRIX
2
TX+
4
TX-
3
RX+
5
RX-
7
GND_ISO
1
SHIELD
USER INTERFACE
+
RX485
-
+
TX485
-
Reference Ground
Earth Ground
USER INTERFACE
+
RX485
-
Reference Ground
Earth Ground
5
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