![background image](http://html.mh-extra.com/html/omron/nt21/nt21_setup-manual_744541026.webp)
2-2
Section
Names and Functions of Parts
14
Rear View
Battery cover
There is a battery holder beneath this cover. The
battery is optional (sold separately) and is not
installed when the NT21 is shipped.
Expansion interface connector
When using an Expansion Interface Unit
such as a Memory Unit, connect it here.
GR terminal
Grounding terminal to
prevent malfunction
due to noise.
Power input terminals
Connect the power to the
NT21 at these terminals.
Serial port A connector
Connect the cable for connection to the host or NT Support
Tool here. A bar code reader can also be connected here.
This is a 9-pin connector for RS-232C only.
Serial port B connector
Connect the cable for connection to the
host here. An NS-AL002 Link Adapter can
be connected directly to this port. This is a
9-pin connector for RS-232C only.
Note Before turning the power ON/OFF, confirm system safety, otherwise the system
may operate unpredictably.