Omron Programmable Terminals NT31 NT31C Setup Manual page 134

Connecting to the Host's RS-422A/485 Port
Reference:
Connecting between
NT31/NT31C Units
1
14
13 25
Connecting an NT31/NT31C and a Host
S Communication using the RS-422A type standard NT link (1:N) method is
possible only when a CS1W-SCB41 Serial Communications Board is installed
in a CS1 series CS1G/H, a Communications Board is installed in a C200HX/
HG/HE(-Z)E, or a CQM1H-SCB41 Serial Communications Board is installed
in a CQM1H.
S Communication using the RS-422A type high-speed NT link (1:N) method is
possible only when a CS1W-SCB41 Serial Communications Board is installed
in a CS1 series CS1G/H.
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
RS-422A
:
NT31/NT31C side
Abbreviation Pin number
Shielding wire
Connector
FG
hood
−
1
RS-232C/
SD 2
422A/485
connector
RD 3
RS 4
CS 5
−
6
SG
7
−
8
:
TRM 9
RDB (+)
10
RDB (+) 11
−
12
−
13
−
14
SDA (−) 15
RDA (−) 16
−
− −
RSB (+) 23
RSA (−) 24
−
25
(25-pin type)
*2
Make the connection between pin numbers 9 and 10 at the NT31/NT31C at the
end of the RS-422A cable (marked
In order to avoid an FG ground loop, connect the functional ground of only one of
the NT31/NT31C units to the shielding of the RS-422A cable.
NT31/NT31C
Host
1
NT31/NT31C side
Pin number Abbreviation
Connector
FG
hood
−
1
RS-232C/
2 SD
422A/485
connector
3 RD
4 RS
5 CS
−
6
SG
7
−
8
9 TRM
RDB (+)
10
11 RDB (+)
−
12
−
13
−
14
13
15 SDA (−)
16 RDA (−)
−
−
−
23 RSB (+)
24 RSA (−)
−
25
(25-pin type)
in the figure above) only.
:
Host
RS-422A
Section 5-2
14
25
123