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Connecting to the Host’s RS-232C Port
Section 5-1
5-1-2 1:1 Connection between RS-422A/485 at the NT31/NT31C and
RS-232C at the Host
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
Serial port B
(RS-422A/485,
25-pin type)
Host link unit/CPU
SYSMAC
C-series PC,
CVM1/CV-series PC, SRM1
25-pin connector
RS-232C/RS-422A
convertor unit
(NT-AL001)
9-pin connector or
25-pin connector
RS-422A/485 cable
(max. length: 500 m)
RS-422A terminal block
9-pin connector
RS-232C cable
with connectors
Reference: When using RS-485 as a port for the NT31/NT31C, only NT link (1:N) method can
be used.
Connecting an NT31/NT31C and NT-AL001 (RS-422A)
RS-422A
NT31/NT31C
Host
NT-AL001
NT31/NT31C side
1
14
13 25
7
5
3
1
NT-AL001 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
Pin number
6
5
4
3
1
Abbreviation
RDA
RDB
SDA
SDB
Functional
ground
8
6
4
2
RS-232C/
422A/485
connector
RS-422A
terminal
block
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.
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