Page 2 Wednesday, May 20, 2009 2:27 PM FCC Information This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Page 3 Wednesday, May 20, 2009 2:27 PM US221 / US421 User Manual Online Registration You can register your product at our online support center: International http://support.aten.com North America http://www.aten-usa.com/product_registration Online Support International Email Support support@aten.com Online Technical Support http://support.aten.com...
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Page 5 Wednesday, May 20, 2009 2:27 PM Overview The US221 / US421 is a 2/4-port USB 2.0 Peripheral Switch that allows up to 2/4 computers to share the use of a single USB peripheral device (such as a printer, scanner, mass storage drive, etc.*) on a one-at-a-time basis.
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Page 6 Wednesday, May 20, 2009 2:27 PM Features Enables two (US221 ) or four (US421 ) computers to share a single USB peripheral device Simple port selection via pushbuttons or easy-to-use configuration utility Auto Switch function – no need for a separate print server USB 2.0 compliant...
Page 7 Wednesday, May 20, 2009 2:27 PM System Requirements Computers The following equipment must be installed on each computer that is to be connected to the system: USB host controller Cables USB to USB cables to connect the computers to the peripheral device.
Page 9 Wednesday, May 20, 2009 2:27 PM Rear View Component Description Lock LED Lights orange to show that the US221 US421 is locked. Port Selection Pressing a Port Selection Pushbutton brings Pushbutton(s) control to the computer attached to its corresponding port.
Page 10 Wednesday, May 20, 2009 2:27 PM Installation 1. Make sure that the power to any device that you connect to the installation has been turned off and that all devices are properly grounded. The US221 / US421 USB 2.0 Peripheral Switch provides 2/4...
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Page 12 Wednesday, May 20, 2009 2:27 PM Manual Operation – Pushbutton Note: Manual operation and the software-based configuration utility operate independently; commands from one will not override the other. US221 To toggle the USB peripheral focus between the two computers, press the port selection pushbutton (located on the top of the unit).
Page 13 Wednesday, May 20, 2009 2:27 PM Software Operation Installing the Configuration Utility The US221 / US421 has a software-based configuration utility that can be used to configure the US221 / US421 's settings, such as the Auto Switch function, Manual Switch and Release reminder, and sound effects.
Page 14 Wednesday, May 20, 2009 2:27 PM Basic Operation When you click on the icon in your system tray, a menu bar of shortcuts appears. The first item at the top of the menu is one of four shortcuts, depending on the current status of the US221 US421 .
Page 15 Wednesday, May 20, 2009 2:27 PM Advanced Operation and Settings To use the Configuration Utility to view and change the US221 US421 ’s settings, click on the icon in your system tray and select Settings. The following dialog box appears:...
Page 16 Wednesday, May 20, 2009 2:27 PM Printers If your USB device is a printer or MFP (multifunction printer) and you wish to use its print function, enable the Print Function Only button and select the printer from the drop-down menu.
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Page 17 Wednesday, May 20, 2009 2:27 PM Multifunction Printers If your USB 2.0 peripheral device is a multifunction printer and you wish to use its scan function, there are three ways to do this: If the multifunction printer’s scan function have dedicated applications, enable both the Print Function Only and the Other Devices/Applications buttons and click Add.
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Page 18 Wednesday, May 20, 2009 2:27 PM Manual Switch and Release If the US221 / US421 is operating under manual control (with a USB 2.0 peripheral such as a storage device, for example), enable this button to set the time for a reminder to release control...
Page 19 Wednesday, May 20, 2009 2:27 PM Troubleshooting First, make sure that all cables are securely attached and seated completely in their sockets. Problem Possible Cause Action Unit operates Static electricity may Disconnect the erratically cause the unit to appropriate USB cable operate erratically.
Page 20 Wednesday, May 20, 2009 2:27 PM Specifications Function US221A US421A Computer Connections Computer Selection Pushbuttons, Software, Auto Switch Connectors Computer 2 x USB Type B 4 x USB Type B Device 1 x USB Type A LEDs...
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