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Rear View
No.
Component
Description
1
Lock LED
Lights orange to show that the US221
A
/
US421
A
is locked.
2
Port Selection
Pushbutton(s)
Pressing a Port Selection Pushbutton brings
control to the computer attached to its
corresponding port. See
, page 12 for further details.
3
Port Selected
LEDs
Lights green to show that the computer
attached to its corresponding port has control.
4
Beeper On/Off
Switch (on side)
Use this recessed switch to turn the US221
A
/
US421
A
’s beeper on or off.
5
USB Type B
Computer Port
Your computers plug into these ports. See
, page 10 for further details.
6
USB Type A
Peripheral Port
Your USB 2.0 peripheral device plugs into this
port.
5
6
5
6
