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View
Connect Sensors or Motors to the NXT port(s). View 
[View] will help you select the right port or check the 
default settings.
Select View [View] in the NXT display.
In the View [View] submenu, you can do a quick test of 
your Sensors and Motors and see the current data for 
each.
NXT Main Menu
Technology
Select the icon of the Sensor or Motor 
that you want to test. You can only get 
readings from one sensor or motor at a 
time.
Select the port to which the Sensor or 
Motor is attached.
The data from the Sensor or Motor 
appears on the display.