Appendices
A-46
CP1E CPU Unit Hardware User’s Manual(W479)
z DIP Switch for Operation Settings
*1 Set both pins 2 and 3 to either ON (2-wire) or OFF (4-wire).
*2 To disable the echo-back function, set pin 5 to ON (RS control enabled).
*3 When connecting to a device on the N side in a 1: N connection with the 4-wire method, set pin 6 to ON (RS
control enabled).
Also, when using 2-wire connections, set pin 6 to ON (RS control enabled).
z Dimensions
The NT-AL001 RS-232C/RS-422A Conversion Unit is used to connect a device with RS-232C terminals
to a device with RS-422A terminals.
A cable is used to connect the built-in RS-232C port of the CP1E N/NA(S)-type CPU Unit.
The Conversion Unit is insulated, so the maximum distance for RS-422A is 500 m.
z Appearance
Pin Setting ON OFF
1 Terminating resistance selec-
tion
Terminating resistance connected
(both ends of transmission path)
Terminating resistance
not connected
2
2-wire or 4-wire selection*
1
2-wire connections 4-wire connections
3
2-wire or 4-wire selection*
1
2-wire connections 4-wire connections
4 Not used. −−
5
RS control selection for RD*
2
RS control enabled RS control disabled
(Data always received.)
6
RS control selection for SD*
3
RS control enabled RS control disabled
(Data always sent.)
NT-AL001 RS-232C/RS-422A Conversion Unit
5.8 38.8
34.0
18.2
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