Omron NT31 User Manual

143
Connecting to the Host’s RS-422A/485 Port
Section 5-2
Connecting between NT31/NT31C Units

Next PT
Shielding wire

RS-485
Host
NT31/NT31C side
(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
1
14
13 25
1
14
13 25
NT31/NT31C
* Make the connection between pin numbers 9 and 10 at the NT31/NT31C at the end
of the RS-485 cable (marked “” in the figure above) only.
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.

Omron NT31 Specifications

General

Brand	Omron
Model	NT31
Category	Touch terminals
Language	English