Omron Programmable Terminals NT31 NT31C User Manual
Page 135
5-2
Section
Connecting to the Host’s RS-422A/485 Port
124
Wiring When Connecting a CS1-series CS1G/H Serial Communication
Board, C Series C200HX/HG/HE(-Z)E Communication Board, or CQM1H
Serial Communications Board
Applicable units:
CS1G-CPU42-E(V1)
CS1G-CPU43-E(V1)
CS1G-CPU44-E(V1)
CS1G-CPU45-E(V1)
CS1H-CPU63-E(V1)
CS1H-CPU64-E(V1)
CS1H-CPU65-E(V1)
CS1H-CPU66-E(V1)
CS1H-CPU67-E(V1)
C200HE-CPU32-(Z)E
C200HE-CPU42-(Z)E
C200HG-CPU33-(Z)E
C200HG-CPU43-(Z)E
C200HG-CPU53-(Z)E
C200HG-CPU63-(Z)E
C200HX-CPU34-(Z)E
C200HX-CPU44-(Z)E
C200HX-CPU54-(Z)E
C200HX-CPU64-(Z)E
C200HX-CPU65-ZE
C200HX-CPU85-ZE
CQM1H-CPU51
CQM1H-CPU61
1
14
13
25
NT31/NT31C side
Shielding wire
(25-pin type)
Abbreviation
FG
−
SD
RD
RS
CS
−
SG
−
TRM
RDB (+)
SDB (+)
−
−
−
SDA (
−)
RDA (
−)
−
−
RSB (+)
RSA (
−)
−
Pin number
Connector
hood
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
−
23
24
25
RS-232C/
422A/485
interface
6
5
9
1
RS-422A
interface
Pin number
Connector
hood
1
2
3
4
5
6
7
8
9
Abbreviation
FG
SDA (
−)
SDB (+)
−
−
−
RDA (
−)
−
RDB (+)
−
(9-pin type)
PC side
Next PT
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.