Installation manual

DS2100N REFERENCE MANUAL
3
If the RTS/CTS handshaking protocol is enabled, the DS2100N activates the RTS232 output
to indicate a message is to be transmitted. The receiving unit activates the CTS232 input to
enable the transmission.
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:
Pin Name Function
2 TX485+ RS485 Transmit Data +
4 TX485- RS485 Transmit Data -
3 RX485+ RS485 Receive Data +
5 RX485- RS485 Receive Data -
7 SGND Signal Ground
DS2100N
TX485+
2
TX485-
4
RX485+
3
RX485
RX485-
5
TX485
7
SGND
SGND
USER INTERFACE
+
-
+
-
Chassis
1
Figure 20 - RS485 Full-duplex Connections
NOTE
For applications that do not use RX485 signals, do not leave these lines
floating but connect them to SGND as shown below.
DS2100N
TX485+
2
TX485-
4
RX485+
3
RX485
RX485-
5
7
SGND
SGND
USER INTERFACE
+
-
Chassis
1
Figure 21 - RS485 Full-duplex Connections using Only TX Signals
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