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Serial Communications Unit
Signal Pin
RDA
RS-422A
RDB
/485 in-
terface
SDA
SDB
FG
4-wire
Terminal
Terminating
block
resistance: ON
connector
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
RS-422A
Pin Signal
1
2
1
GRD
3
2
SG
4
3
SDB
5
4
SDA
5
RDB
6
RDA
7
CSB
8
CSA
Shield
RS-422
Terminal block
DIP switch pin
1-2: OFF
(terminating resistance)
Other pins as given below.
Pin Signal
1
GRD
2
SG
3
SDB
4
SDA
5
RDB
6
RDA
7
CSB
8
CSA
RS-422
Terminal
block
DIP Switch Settings
SW1-1: ON
SW1-2: ON
SW1-3: OFF
SW1-4: OFF
SW1-5: OFF
SW1-6: ON
NT-AL001
Shield
Signal Pin
Signal
RS-232C
NC
1
FG
SD
2
SD
RD
3
RD
RS-232C
RS
4
RS
Interface
CS
5
CS
5V
6
DR
7
DR
ER
8
ER
SG
9
SG
RS-232
5-V power
D-sub, 9-pin
(+)
connector
(-)
(male)
NT-AL001
Shield
Signal Pin
Signal
RS-232C
NC
1
FG
SD
2
SD
RD
3
RD
RS-232C
RS
4
RS
Interface
CS
5
CS
5V
6
DR
7
DR
ER
8
ER
SG
9
SG
RS-232
5-V power
D-sub, 9-pin
(+)
connector
(-)
(male)
(terminating resistance)
3 Installation and Wiring
3
3-17
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