Datalogic QLM500 Installation Manual Page 70

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DS2400N REFERENCE MANUAL
58
5
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
Function
2
TX+
RS485 Transmit Data +
3
RX+
RS485 Receive Data +
4
TX-
RS485 Transmit Data -
5
RX-
RS485 Receive Data -
7
GND
Ground
DS2400N
TX+
2
TX-
4
RX+
3
RX485
RX-
5
TX485
7
GND
GND
USER INTERFACE
+
-
+
-
Chassis
1
Figure 65 - RS485 Full-duplex Connections
For applications that do not use RX signals, do not leave these lines floating
but connect them to GND as shown below.
DS2400N
TX+
2
TX-
4
RX+
3
RX485
RX-
5
7
GND
GND
USER INTERFACE
+
-
Chassis
1
Figure 66 - RS485 Full-duplex Connections using Only TX Signals
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.ctiautomation.net - Email: [email protected]
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