1:1 Connection Between Rs-422A/485 At The Nt31/Nt31C And Rs-232C At The Host - Omron NT31 Operation Manuals

Connecting to the Host's RS-232C Port
5-1-2 1:1 Connection between RS-422A/485 at the NT31/NT31C and
RS-232C at the Host
Reference: When using RS-485 as a port for the NT31/NT31C, only NT link (1:N) method can
Connecting an NT31/NT31C and NT-AL001 (RS-422A)
The connection method in which the RS-422A/485 port of an NT31/NT31C and
the RS-232C port of a host are connected via a convertor unit is described here.
An RS-232C/RS-422A convertor unit (NT-AL001) is used to convert between the
RS-232C and RS-422A communication methods.
NT31/NT31C
25-pin connector
be used.
NT31/NT31C
1
14
13 25
In order to avoid an FG ground loop, do not make the connection between the func-
tional ground of the NT-AL001 and the shielding.
Serial port B
(RS-422A/485,
25-pin type)
RS-232C/RS-422A
convertor unit
(NT-AL001)
RS-422A/485 cable
(max. length: 500 m)
RS-422A terminal block
NT-AL001
RS-422A
NT31/NT31C side
Abbreviation Pin number Shielding wire
Connector
FG
hood
−
1
SD 2
RS-232C/
422A/485
RD 3
connector
RS 4
CS 5
−
6
SG 7
−
8
TRM 9
RDB (+) 10
SDB (+) 11
−
12
−
13
−
14
SDA (−) 15
16
RDA (−)
−
− −
RSB (+) 23
RSA (−) 24
−
25
(25-pin type)
Section 5-1
Host link unit/CPU
SYSMAC
C-series PC,
CVM1/CV-series PC, SRM1
9-pin connector or
25-pin connector
RS-232C cable
with connectors
9-pin connector
Host
NT-AL001 side
Pin number Abbreviation
6 RDA
5 RDB RS-422A
terminal
4 SDA
block
3 SDB
Functional
1
ground
8
7
6
5
4
3
2
1
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