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20 C1648M (4/05)
Figure 11.
RS-485 2-Wire (Half Duplex) Data Communication Wiring
RS-485 2-WIRE
DATA SELECTION
FR85081
RECEIVER –
DATA CONNECTOR
3
4
5
6
7
8
GND
RX+/TX+
--RX /TX
DEVICE A
FT85081
TRANSMITTER –
DATA CONNECTOR
DEVICE B
RS-485 2-WIRE
DATA SELECTION
3
4
5
6
7
8
GND
RX+/TX+
--RX /TX
RS-485
2-WIRE
1 (TX+/RX+) DATA OUT+/DATA IN+
2 (TX-/RX-) DATA OUT-/DATA IN-
RS-485
2-WIRE
1 (TX+/RX+) DATA OUT+/DATA IN+
2 (TX-/RX-) DATA OUT-/DATA IN-
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
RS-485 2-WIRE DATA CONNECTIONS BETWEEN DEVICE A AND FR85081 RECEIVER
RS-485 2-WIRE DATA CONNECTIONS BETWEEN DEVICE B AND FT85081 TRANSMITTER