Omron NS7 Series Setup Manual page 210

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.
DIP switch
The factory setting for the DIP switch is all pins set to OFF.
Pin
Pin 1
Pins 2 and 3 Two-wire/four-wire method selection
Pin 4
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
Appendix 4 Using NS-AL002 RS-232C/RS-422A Converters
OFF
ON
Function
Transmission mode
Terminating resistance
Terminal block
Signal name
pin number
1 NC
2 RD
3 SD
4 CS
5 RS
5 V
6
(30 mA max.)
7 or 8 NC
9 SG
Connector hood FG
ON
RS/CS control Normal transmission
Two-wire method Four-wire method
Yes None
Signal direction
Adapter Û PT
¬
®
¬ (RS signal short-circuited internally)
®
¬
(Pins 7 and 8 are short-circuited.)
-
Connects to functional ground terminal of
PT.
OFF
A-15