A-115
Appendices
CJ2 CPU Unit Hardware User’s Manual
A-4 Connecting to a Serial Port on the CPU Unit
App
A-4-1 Serial Port Interface Types and
Specifications
Dimensions (Unit: mm)
NT-AL001 RS-232C/RS-422A Link Adapter
The NT-AL001 RS-232C/RS-422A Link Adapter is used to connect to devices that have RS-232C or
RS-422A terminals. It is connected with a cable to the RS-232C port on a CJ2 CPU Unit. It is iso-
lated, so the maximum distance for RS-422A is 500 m.
Appearance
DIP Switch Settings
There is a DIP switch on the NT-AL001 RS-232C/RS-422A Link Adapter that is used to set RS-
422A/485 communications parameters. Set the DIP switch as required for the serial communica-
tions mode according to the following table.
* When connecting to a CJ-series CPU Unit, turn OFF pin 5 and turn ON pin 6.
Pin Function
Default
setting
1 Not used. (Leave set to ON.) ON
2 Internal terminating resistance setting.
ON: Terminating resistance connected.
OFF: Terminating resistance not connected.
ON
3 2-wire/4-wire setting
Both pins ON: 2-wire communications
Both pins OFF: 4-wire communications
OFF
4 OFF
5 Communications mode*
Both pins OFF: Always send.
5 OFF/6 ON: Send when RS-232C's CS is high.
5 ON/6 OFF: Send when RS-232C's CS is low.
ON
6 OFF
5.8 38.8
34.0
18.2
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