To connect a motor to the NXT, use one of the black 6-wire 
cables. Attach one end of the cable to the motor and the other to 
one of the NXT’s output ports (A, B, or C).
To connect a sensor to the NXT, use one of the black 6-wire 
cables. Attach one end of the cable to the sensor and the other 
to one of the NXT’s input ports (1, 2, 3, or 4).
The USB port and wireless Bluetooth connection let you download and 
upload data between your computer and the NXT. If your computer has 
Bluetooth capability, you can download programs to the NXT without using 
the USB cable. If your computer does not have Bluetooth capability, you 
must use the USB cable or install a Bluetooth USB dongle on your computer.  
NOTE: Read more about wireless Bluetooth communication on page 36.
Note that ALL of the black 6-wire 
cables can be used in both input 
and output ports, sensors and 
motors. To work, sensors MUST be 
attached to the input ports (1-4) 
and motors MUST be attached to 
the output ports (A-C).