Omron NT31 Operation Manuals page 152

Connecting to the Host's RS-422A/485 Port
Connecting an NT31/NT31C and a Host
NT31/NT31C
S Wiring when connecting a CS1-series CS1G/H serial communication board and
C series C200HX/HG/HE (–ZE) communication board
Applicable units:
1
14
RS-232C/
422A/485
interface
13 25
In order to avoid an FG ground loop, do not connect the functional ground of the
NT31/NT31C to the shielding of the RS-422A cable.
RS-422A
CS1G-CPU42-E
CS1G-CPU44-E
CS1H-CPU63-E
CS1H-CPU65-E
C200HE-CPU32-(Z)E
C200HG-CPU33-(Z)E
C200HG-CPU53-(Z)E
C200HX-CPU34-(Z)E
C200HX-CPU54-(Z)E
C200HX-CPU65-ZE
NT31/NT31C side
Abbreviation Pin number
Connector
FG
hood
−
1
SD 2
RD 3
RS 4
CS
5
−
6
Shielding wire
SG 7
−
8
TRM
9
RDB (+)
10
SDB (+)
11
−
12
−
13
−
14
SDA (−) 15
RDA (−) 16
−
− −
RSB (+) 23
RSA (−)
24
−
25
(25-pin type)
Next PT
Host
CS1G-CPU43-E
CS1G-CPU45-E
CS1H-CPU64-E
CS1H-CPU66-E
CS1H-CPU67-E
C200HE-CPU42-(Z)E
C200HG-CPU43-(Z)E
C200HG-CPU63-(Z)E
C200HX-CPU44-(Z)E
C200HX-CPU64-(Z)E
C200HX-CPU85-ZE
PC side
Pin number Abbreviation
Connector
FG
hood
SDA (−)
1
RS-422A
interface
2 SDB (+)
−
3
−
4
−
5
6 RDA (−)
−
7
8 RDB (+)
−
9
(9-pin type)
Section 5-2
6
1
9
5
141