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Rear View
No. Component Description
1 Lock LED Lights orange to show that the US221A /
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 Manual Operation –
Pushbutton, 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
Installation, page 10 for further details.
6 USB Type A
Peripheral Port
Your USB 2.0 peripheral device plugs into this
port.
5
6
5
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