Omron Programmable Terminals NT31 NT31C Setup Manual page 137

Connecting to the Host's RS-422A/485 Port
Connecting between NT31/NT31C Units
1
14
13 25
Connecting an
NT31/NT31C and a Host
126
NT31/NT31C
RS-485
:
NT31/NT31C side
Abbreviation Pin number
Shielding wire
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
SDB (+) 11
−
12
−
13
−
14
SDA (−) 15
RDA (−)
16
−
− −
RSB (+) 23
RSA (−) 24
−
25
(25-pin type)
Next PT
*2
Make the connection between pin numbers 9 and 10 at the NT31/NT31C at the
end of the RS-485 cable (marked
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.
The relay terminal block is not included in this figure. Insert the relay terminal
block so as to achieve the wiring configuration shown below.
NT31/NT31C
Wiring When Connecting a CS1-series CS1G/H Serial Communication
Board, C Series C200HX/HG/HE(-Z)E Communication Board, or CQM1H
Serial Communications Board
Applicable units:
Host
NT31/NT31C side
Pin number Abbreviation
Connector
FG
hood
−
1
RS-232C/
SD
2
422A/485
3 RD
connector
4 RS
CS
5
−
6
7 SG
−
8
9 TRM
RDB (+)
10
11 SDB (+)
−
12
−
13
−
14
15 SDA (−)
RDA (−)
16
−
− −
23 RSB (+)
24 RSA (−)
−
25
(25-pin type)
in the figure above) only.
:
RS-485
CS1G-CPU42-E(V1)
CS1G-CPU44-E(V1)
CS1H-CPU63-E(V1)
Section 5-2
1
14
13 25
Host
CS1G-CPU43-E(V1)
CS1G-CPU45-E(V1)
CS1H-CPU64-E(V1)