Omron NT20S Operation Manual page 279

Method for Making the Cable for Connection to the Host
S Wiring Connections
CVM1/CV-series host link units have two types of connector, which must be wired differently.
The NT20S does not use pin 4 (RS) or pin 5 (CS). Either short the RS and CS pins of the PC connector together or
set the CTS setting selector switch at the rear face of the host link unit to "0V" (see
Connect the cable shielding wire to the connector cover and pin 1 at the host link unit end of the cable only.
Communication Port 1 (25-pin Connector)
NT20S
RS-232C
interface
Communication Port 2 (9-pin Connector)
NT20S
RS-232C
interface
260
Abbrevi- Pin
atioon number
1
SD 2
RD 3
RS 4
CS 5
– 6
– 7
– 8
SG 9
Abbrevi- Pin
atioon number
1
SD 2
RD 3
RS 4
CS 5
6
7
8
SG 9
PC (host link unit)
Pin
number
1
2
3
4
5

6
7
8
Shielding
–
wire
–
–
–
20
25-pin connector
PC (host link unit)
Pin
number
Connector
cover
2
3
4
5

6
7
–
9
9-pin connector
Shielding
wire

in the figure).
Abbrevi-
atioon
FG
SD
RD
RS-232C
RS
interface
CS
–
SG
–
–
–
–
–
ER
Abbrevi-
atioon
FG
SD
RD
RS-232C
RS
interface
CS
–
CD
–
SG
Appendix G