Appendix 4 Using NS-AL002 RS-232C/RS-422A Converters
A-15
A-4-4 DIP Switch Settings
The Adapter has four DIP switch pins for setting the RS-422A communications conditions.
Set the DIP switch pins before connecting the cables to the Adapter.
ON
OFF
DIP switch
The factory setting for the DIP switch is all pins set to OFF.
Pin Function ON OFF
Pin 1 Transmission mode RS/CS control Normal transmission
Pins 2 and 3 Two-wire/four-wire method selection Two-wire method Four-wire method
Pin 4 Terminating resistance Yes None
For 1:1 NT Link, set the RS-422A transmission mode to normal transmission (pin 1 OFF).
For 1:N NT Links (normal, high speed), set the RS-422A transmission mode to RS/CS
control (pin 1 ON).
A-4-5 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 Û 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.
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