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22 C1645M-A (9/06)
Figure 11. RS-485 2-Wire (Half Duplex) Data Communication Wiring
RS-485 2-WIRE
DATA SELECTION
RS-485 2-WIRE DATA CONNECTIONS BETWEEN DEVICE A AND FR85041 RECEIVER
FR85041
RECEIVER –
DATA CONNECTOR
3
4
5
6
7
8
GND
R+/T+
R-/T-
R+/T+
R-/T-
DEVICE A
RS-485 2-WIRE DATA CONNECTIONS BETWEEN DEVICE B AND FT85041 TRANSMITTER
FT85041
TRANSMITTER –
DATA CONNECTOR
DEVICE B
RS-485 2-WIRE
DATA SELECTION
3
4
5
6
7
8
GND
RS-485
2-WIRE
1 T+/R+
2 T-/R-
(DATA OUT+/DATA IN+)
(DATA OUT-/DATA IN-)
T+/R+
T-/R-
(DATA OUT+/DATA IN+)
(DATA OUT-/DATA IN-)
RS-485
2-WIRE
1
2
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
C1645M-A.book Page 22 Wednesday, September 13, 2006 3:07 PM