Omron Programmable Terminals NT31 NT31C Manual de usuario Pagina 106

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5-1SectionConnecting to the Host’s RS-232C Port
95
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.
RS-422A
NT31/NT31C
Host
NT-AL001
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 (+)
RDB (+)
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 (+)
RDB (+)
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
*2
Make the connection between pin numbers 9 and 10 at the terminal NT31/NT31C
(marked
in the figure above) only.
In order to avoid an FG ground loop, make the connection between the connec-
tor hood and the shielding at one side only.
Connection between
NT31/NT31C Units
(RS-422A)
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