Omron Programmable Terminals NT31 NT31C Setup Manual page 104

Connecting to the Host's RS-232C Port
Connecting an
NT31/NT31C and
NT-AL001 (RS-422A)
1
13
The relay terminal board is not included in the figure below. Insert a relay termi-
nal board so as to achieve the wiring configuration indicated below.
NT31/NT31C
RS-422A
NT31/NT31C side
14
Abbreviation Pin number
Connector
FG
hood
−
1
RS-232C/ SD 2
422A/485
RD 3
connector
RS 4
CS 5
−
6
SG 7
−
8
TRM 9
RDB (+) 10
RDB (+) 11
−
12
−
13
−
14
SDA (−) 15
25
RDA (−) 16
−
− −
RSB (+) 23
24
RSA (−)
−
25
(25-pin type)
In order to avoid an FG ground loop, do not make the connections between the
functional ground of the NT-AL001 and the shielding.
Host
NT-AL001
Shielding wire
NT-AL001 side
Pin number Abbreviation
6 RDA
5 RDB
4 SDA
3 SDB
Functional
1
ground
Next PT
Section
8
7
6
5
4
3
2
1
RS-422A
terminal
block
5-1
93