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C1645M-A (9/06) 23
Figure 12. RS-485 4-Wire (Full Duplex) Data Communication Wiring
RS-485 4-WIRE
DATA SELECTION
RS-485 4-WIRE DATA CONNECTIONS BETWEEN DEVICE A AND FR85041 RECEIVER
FR85041
RECEIVER –
DATA CONNECTOR
1 TX+
2 TX-
3 RX+
4 RX-
(DATA OUT+)
(DATA OUT-)
(DATA IN+)
(DATA IN-)
TX+
TX-
RX+
RX-
(DATA OUT+)
(DATA OUT-)
(DATA IN+)
(DATA IN-)
5
6
7
8
GND
RX+
RX-
TX+
TX-
DEVICE A
FT85041
TRANSMITTER –
DATA CONNECTOR
RS-485 4-WIRE
DATA SELECTION
RS-485 4-WIRE DATA CONNECTIONS BETWEEN DEVICE B AND FT85041 TRANSMITTER
1
2
3
4
5
6
7
8
GND
RX+
RX-
TX+
TX-
DEVICE B
RS-485
4-WIRE
RS-485
4-WIRE
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
C1645M-A.book Page 23 Wednesday, September 13, 2006 3:07 PM