Method For Connection To The Host - Omron NT20S-ST121B-EV3 User Manual

Method for Connection to the Host

1-3

Method for Connection to the Host

Note
8
This section describes the methods for connection to the host used with the
NT20, and the relationship between the connection method and the communi-
cations method.
NT20 Communications Ports and Communications Methods
The NT20 has two communications ports. Their uses are indicated in the
table below.
Communications Usable Communications
Port
Serial port A Host Link
1:1 NT Link
1:N NT Link (See note.)
RS-232C (command control) (NT-
20-ST128)
(NT Support Tool connection)
Serial port B Host Link
1:1 NT Link
1:N NT Link (See note.)
RS-232C (command control) (NT-
20-ST128)
There are two 1:N NT Link communications rates: standard and high-speed.
Converting Communications Type with the RS-232C/RS-422A Link
Adapter and RS-422A Converter
An OMRON NT-AL001 Link Adapter or CJ1W-CIF11 RS-422A Converter can
be used convert from RS-232C communications to either RS-422A or RS-
485.
• RS-232C ⇔ RS-422A
• RS-232C ⇔ RS-485
There are two models of Link Adapter/RS-422A Converter are available. They
provide different features:
• NT-AL001 Link Adapter
The RS-232C port is insulated from the RS-422A/485 terminals. An RS-
232C cable (2 m max.) can be connected to either serial port A or B on
the NT20.
• CJ1W-CIF11 RS-422A Converter
The RS-232C port is not insulated from the RS-422A/485 terminals. The
CJ1W-CIF11 RS-422A Converter can be connected to either serial port A
or B on the NT20.
• Communications Distance
Use the NT-AL001 if the communications distance exceeds 50 m.
Methods
RS-232C
RS-232C
Section 1-3
Communications