Rear View
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No. | Component | Description |
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1 | Lock LED | Lights orange to show that the US221A / |
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| US421A is locked. |
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2 | Port Selection | Pressing a Port Selection Pushbutton brings |
| Pushbutton(s) | control to the computer attached to its |
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| corresponding port. See Manual Operation – |
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| Pushbutton, page 12 for further details. |
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3 | Port Selected | Lights green to show that the computer |
| LEDs | attached to its corresponding port has control. |
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4 | Beeper On/Off | Use this recessed switch to turn the US221A / |
| Switch (on side) | US421A’s beeper on or off. |
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5 | USB Type B | Your computers plug into these ports. See |
| Computer Port | Installation, page 10 for further details. |
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6 | USB Type A | Your USB 2.0 peripheral device plugs into this |
| Peripheral Port | port. |
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