Pin Arrangement - Omron Programmable Terminals NT31 NT31C Setup Manual

Using an RS-232C/RS-422A Convertor Unit

Pin Arrangement

The convertor unit 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
7
8
6
5
7
4
3
6
2
1
5
4
3
2
1
* The CSB and CSA signals are for specialized applications.
RS-232C Connector
Connector
pin No.
1
1
6
2
7
2
3
8
3
4
9
4
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 convertor
unit
Data set ready
(shorted to ER internally)
Data terminal ready
(shorted to DR internally)
Signal ground
Signal direction
(convertor unit ⇔ RS-422
Abbreviation
CSA
CSB
RDA
RDB
SDA
SDB
SG (GND)
Signal direction
(convertor unit ⇔ RS-232C
Abbreviation
–
SD
RD
RS
CS
+5 V
DR
ER
SG
Appendix C
device)
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