Omron NT20S Operation Manual page 277

Method for Making the Cable for Connection to the Host
S Wiring Connections
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.
NT20S
RS-232C
interface
Connecting an NT20S to a C-Series CPU (CjjH)
S C-Series CPU Unit (CjjH) 9-pin Connector Specifications
S Applicable CPU:
S Electrical characteristics:
S Signal direction:
1
5
258
Abbrevi- Pin
atioon number
1
SD 2
RD 3
RS 4
CS 5
6
7
8
SG 9
C20H/C28H/C40H/C60H
Complies with EIA RS-232C
Signal input and output is relative to the PC.
Connector Connector
6
Pin No.
1
2
3
4
5
7
9
PC (host link unit)
Pin
number
1
2
3
4
5

6
7
8
Shielding
–
wire
–
–
–
20
25-pin connector
Signal Name Signal Name
Frame ground
Send data
Receive data
Request to send
Clear to send
Signal ground

in the figure).
Abbrevi-
atioon
FG
SD
RD
RS-232C
RS
interface
CS
–
SG
–
–
–
–
–
ER
Abbreviation Abbreviation
FG
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
SG (GND)
Appendix G
Signal Direction
Input Output
– –
f
f
f
f
– –