2-1SectionMethod for Connection to the Host
10
2-1 Method for Connection to the Host
This section describes the methods for connection to the host used with the
NT21, and the relationship between the connection method and the commu-
nication method.
NT21 Communication Ports and Communication Methods
The NT21 has two communication ports. Their uses are indicated in the table
below.
Communication
Port
Usable Communication Methods Communications
Serial port A
Host Link
1:1 NT Link
1:N NT Link
*
Memory Link
(NT Support Tool connection)
(Bar code reader input function)
RS-232C
Serial port B
Host Link
1:1 NT Link
1:N NT Link
*
Memory Link
RS-232C
* There are two 1:N NT Link communications rates: standard and high-speed.
Communication Methods That Can Be Used with the Host
The following communication methods
can be used with the hosts that can be
connected to the NT21.
• RS-232C
• RS-422A
• RS-485
The communications types that are actually supported vary with the host. For
details, refer to Section 4 Connecting to the Host from the RS-232C Port and
Section 5 Connecting to the Host from the RS-422A/485 Port.
Converting
Communication T
ype with the RS-232C/RS-422A Link
Adapter
An OMRON NT-AL001-E or NS-AL002-E Link Adapter 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 Adapters available with 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 NT21.
• NS-AL002 Link Adapter
The
RS-232C port is
not
insulated from the RS-422A/485 terminals. The NS-
AL002 Link Adapter can be connected directly to serial port B on the NT21.
(The NS-AL002 cannot be connected directly to serial port A on the NT21.)
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