Omron NT31 User Manual

108
Connecting to the Host’s RS-232C Port
Section 5-1
Connection between NT31/NT31C Units (RS-485)
The relay terminal board is not included in the figure below. Insert a relay terminal
board so as to achieve the wiring configuration indicated below.

RS-485
NT31/NT31C
Host
1
14
13 25
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
RS-232C/
422A/485
connector
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
(25-pin type)
NT31/NT31C side
* Make the connection pin numbers 9 and 10 at the terminal NT31/NT31C (marked “”
in the figure above).
In order to avoid an FG ground loop, make the connection between the connector
hood and the shielding at the one side only.

Omron NT31 Specifications

General

Brand	Omron
Model	NT31
Category	Touch terminals
Language	English