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