Rs485 Full-Duplex Interface - Datalogic Matrix 400 Reference Manual

5

5.4.2 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 M16 19-pin connector are used for RS485 full-duplex
communication:
Pin
M
N
U
T
L
Chassis
Earth Ground
For applications that do not use RX485 signals, do not leave these lines
floating but connect them to GND as shown below.
NOTE
Chassis
Earth Ground
Figure 79 - RS485 Full-duplex Connections using Only TX Signals
66
Name Function
TX+ RS485 Transmit Data (+)
TX- RS485 Transmit Data (-)
RX+ RS485 Receive Data (+)
RX- RS485 Receive Data (-)
GND Ground
MATRIX
M
TX+
N
TX-
U
RX+
T
RX-
L
GND
K
SHIELD
Figure 78 - RS485 Full-duplex Connections
MATRIX
M
TX+
N
TX-
U
RX+
T
RX-
L
GND
K
SHIELD
MATRIX 400™ REFERENCE MANUAL
USER INTERFACE
+
RX485
-
+
TX485
-
Reference Ground
Earth Ground
USER INTERFACE
+
RX485
-
Reference Ground
Earth Ground