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Omron NT31

Omron NT31
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143
Connecting to the Hosts 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.

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