
Figure D.1 RS485 (a) 2-wire and (b) 4-wire connections
TD(B)
RD(A)
RD(B)
GND
TD(A)
485DSS
+12
FR. GND
OUTIN
TERMINATION
2W 4W
+12
+12 RTN
HOST
TD(A)
TD(B)
RD(A)
RD(B)
GND
4W2W
TERMINATION
IN OUT
FR. GND
+12
485DSS (END UNIT)
TD(A)
GND
RD(B)
RD(A)
TD(B)
1/2W
100
1/2W
100
1/2W
100 100
1/2W
100
1/2W
100
1/2W
TD(B)
RD(A)
RD(B)
GND
TD(A)
485DSS (END UNIT)
+12
FR. GND
OUTIN
TERMINATION
2W 4W
GND
RD(B)
RD(A)
TD(B)
TD(A)
HOST
+12 RTN
+12
4W2W
TERMINATION
IN OUT
FR. GND
+12
485DSS
TD(A)
GND
RD(B)
RD(A)
TD(B)
100
+12 RTN
+12
+12 RTN
+12
(a) (b)
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