Omron NT20 User Manual page 30

Method for Connection to the Host
Communications
type at Host
RS-232C
Direct 1:1 connection
RS-232C
1:N connection with RS-422A through
Link Adapter and RS-422A Converters
RS-232C
1:N connection with RS-485 through
Link Adapter and RS-422A Converters
Note
Combinations of Communications Method and Connection Method
The connection methods that can be used depending on the communications
method used and the communications type for communications between the
NT20 and the host are indicated in the table below.
Usable Connection Method
PT
RS-232C (15 m max.)
NT-AL001 (See note 1.)
or CJ1W-CIF11 RS-
PT
422A Converter NT-AL001
Link Adapter
RS-422A
RS-232C
(total length 500 m,
(2 m max.)
See note 2.)
NT-AL001 (See note
1.) or CJ1W-CIF11
PT
RS-422A Converter NT-AL001
Link Adapter
RS-232C
RS-485
(2 m max.)
(total length 500 m,
See note 2.)
(1) An RS-232C Cable (not shown in the diagram) is required when connect-
ing an NT-AL001 Link Adapter to a PT.
(2) If the CJ1W-CIF11 is used, the total communications distance is 50 m.
This also applies if both the NT-AL001 and CJ1W-CIF11 are used in the
same communications path.
Usable Communications Method
Host Link
❍
Host
Host
Host
❍: Connection possible
Section 1-3
1:1 NT Link 1:N NT Link
❍ ❍
❍
❍
: Connection not possible
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