Direct Connection Between Rs-422A Ports At Both Units - Omron NT31 Operation Manuals

Connecting to the Host's RS-422A/485 Port
5-2-2

Direct Connection between RS-422A Ports at Both Units

Connecting an NT31/NT31C and Host (RS-422A)
The connection method in which the RS-422A ports of an NT31/NT31C and a host
are connected is described here.
NT31/NT31C
25-pin
connector
NT31/NT31C
S Wiring when connecting a C-series host link unit or CPM1 (host link)
Applicable units:
1
14
RS-232C/
422A/485
connector
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.
Serial port B
(RS-422A, 25-pin type)
RS-422A cable with connectors (max. length: 500m)
RS-422A
C200H-LK202-V1
3G2A5-LK201-EV1
C500-LK203
3G2A6-LK202-EV1
NT31/NT31C side
Abbreviation Pin number
Connector
FG
hood
−
1
SD 2
RD 3
RS
4
CS
5
−
6
SG 7
−
8
TRM 9
RDB (+) 10
SDB (+) 11
−
12
−
13
−
14
SDA (−)
15
RDA (−) 16
−
Shielding wire
−
−
RSB (+) 23
RSA (−) 24
−
25
(25-pin type)
Host link/CPU/
Communication unit
SYSMAC
CS1 series PLC,
C series PLC,
CVM1/CV series
PLC, SRM1
9-pin connector
or 25-pin connector
Host
PC side
Pin number Abbreviation
Connector
FG
hood
1 RDB
RS-422A
−
2 connector
−
3
−
4
5 SDB
6 RDA
7 FG
−
8
9
SDA
(9-pin type)
Section 5-2
6
1
9
5
133