
E-922-1-E
9
4.2.2 Connecting Method
(1) RS422 half duplex system (1 to 1)
(2) RS422 full duplex system (1 to 1)
(3) RS485 half duplex system (1 to 1)
(4) RS485 full duplex system (1 to 1)
+
−
Terminating resistance 330
7
Opposite side
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
+
−TXD
+
−RXD
Opposite side
+
−
Opposite side
+
−TXD
+
−RXD
Terminating resistance 110
7
Opposite side
Terminating resistance 330
7
Terminating resistance 110
7
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
(1) RS422 half duplex system (1 to 1)
(2) RS422 full duplex system (1 to 1)
(3) RS485 half duplex system (1 to 1)
(4) RS485 full duplex system (1 to 1)
+
−
Terminating resistance 330
7
Opposite side
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
+
−TXD
+
−RXD
Opposite side
+
−
Opposite side
+
−TXD
+
−RXD
Terminating resistance 110
7
Opposite side
Terminating resistance 330
7
Terminating resistance 110
7
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
9 1 0 1 1 1 2 1 3 1 4
+ − SG + − SG
RXD
TXD
Card reader
Fig. 4.1