DS8100
18
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 Main Interface connector (Figure A, 15) are used for RS485
full-duplex communications:
Pin
Name
Function
2
TX485+
RS485 transmitted data +
3
TX485-
RS485 transmitted data -
5
GNDRS485
RS485 ground reference
7
RX485+
RS485 received data +
8
RX485-
RS485 received data -
DS8100
5
GNDRS485
TX485+
2
TX485-
3
RX485+
7
RX485-
8
RX485
TX485
GND
USER INTERFACE
Earth
Ground
Figure 15 - RS485 full-duplex interface connections