Omron Programmable Terminals NT31 NT31C - Manual (Page 129)

5-2 Section Connecting to the Host’s RS-422A/485 Port
118
C500-LK203
3G2A6-LK202-EV1
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
connector
6
5
9
1
PC side
RS-422A
connector
Pin number
Connector
hood
1
2
3
4
5
6
7
8
9
Abbreviation
FG
RDB
−
−
−
SDB
RDA
FG
−
SDA
(9-pin type)
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.
Wiring When Connecting CPM1, CPM2A, CPM2C, or SRM1
Applicable units:
CPM1-10CDR- j CPM1-20CDR- j
CPM1A-10CD j-j CPM1A-20CD j-j
CPM1A-30CD
j-j
CPM1A-40CD
j-j
CPM2A-30CD
jj-j
CPM2A-40CD
jj-j
CPM2A-60CD jj-j
CPM2C-10
jjjjjj-j
CPM2C-20
jjjjjj-j
SRM1-C02-V2
Connect to the PC through a CPM1-CIF11 RS-422A Adapter.
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
connector
PC side
RS-422A
terminal
block
Abbreviation
FG
SG
SDB (+)
SDA ( −)
RDB (+)
RDA ( −)
(9-pin type)
FG
SG
SDB
SDA
RDB
RDA
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.