Pin Arrangement - Omron Programmable Terminals NT631 Setup Manual

Using an RS-232C/RS-422A Adapter

Pin Arrangement

The Adapter has a terminal block for an RS-422A/485 interface connection and a connector for an RS-232C
interface connection.
The pin arrangements for the RS-422A/485 terminal block and the RS-232C connector are as follows.
RS-422A/485 Terminal Block
Terminal
block pin
No.
8
8
7
7
6
5
6
4
3
5
2
1
4
3
2
1
* The CSB and CSA signals are for specialized applications.
RS-232C Connector
Connector
pin No.
1
1
2
6
2
3
7
3
8
4
4
9
5
5
6
7
8
9
* The hood is connected to the functional ground terminal of the RS-422A terminal block.
Signal name
Request to send (−)
Request to send (+)
Receive data (−)
Receive data (+)
Send data (−)
Send data (+)
Signal ground
Functional ground
Signal name
Not used
Send data
Receive data
Request to send
(shorted to CS internally)
Clear to send
(shorted to RS internally)
+5 V (150 mA) input for Adapter
Data set ready
(shorted to ER internally)
Data terminal ready
(shorted to DR internally)
Signal ground
Abbreviation Signal direction
(Adapter ⇔ RS-422 device)
→
CSA
→
CSB
←
RDA
←
RDB
→
SDA
→
SDB
SG (GND) –
–
Abbreviation Signal direction
(Adapter ⇔ RS-232C device)
– –
←
SD
→
RD
←
RS
→
CS
→
+5 V
→
DR
←
ER
SG –
Appendix C
263