Appendix 3 Using NS-AL002 Converters
A-3-5 Pin Arrangement
The Adapter has a connector for RS-232C interface connection and a terminal block for
RS-422A/485 interface connection.
The pin arrangements for the RS-232C connector and RS-422A/485 terminal block are as
follows:
● RS-232C Connector
Terminal block
pin number
Signal name Signal direction
Adapter ⇔ PT
1 NC
2 RD ←
3 SD →
4 CS ← (RS signal short-circuited internally)
5 RS →
6 5 V
(30 mA max.)
←
7 or 8 NC (Pins 7 and 8 are short-circuited.)
9 SG −
Connector hood FG Connects to functional ground terminal of PT.
● RS-422A Terminal Block
Terminal block
pin number
Signal name
Signal direction
Adapter ⇔ Host
1 FG Connects to functional ground terminal of PT.
2 RDB (+) ←
3 SDB (+) →
4 RSB (+) →
5 NC ---
6 RDA (−) ←
7 SDA (−) →
8 RSA (−) →
A-20
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