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DS1500
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:
Pin Name Function
6 TX485+ RS485 transmit data +
2 TX485- RS485 transmit data -
3 RX485+ RS485 receive data +
10 RX485- RS485 receive data -
4 SGND signal ground
DS1500
TX485+
6
TX485-
2
RX485+
3
RX485
RX485-
10
TX485
4
SGND
SGND
USER INTERFACE
+
-
+
-
13
SHIELD
Earth Ground
Figure 8 - RS485 Full-duplex Connections
14