asp.net upc-a reader

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Figure 7-23. Use the Find Message dialog box to search for messages meeting certain conditions you have specified.

Some x86-based motherboards with built-in USB controllers feature a BIOS option labeled Assign IRQ to USB. This option must be set to on or yes for USB devices to function.

Verify that you are not exceeding USB power limits. If a USB device attempts to draw more than 500 milliamps (mA) of electrical current, the device must be accompanied by a wall adapter to draw the additional power. If you are unsure about total USB power consumption for your system, use the power supply if one is furnished with your device to guarantee adequate power. The USB specification allows up to five external hubs to be connected in a chain. Always use the cables included with the device and replace damaged or worn cables with an identical type. USB cables come in many kinds and lengths, depending on the capability of the device. Using incorrect cables can degrade performance or cause the device to stop functioning.

To view information about USB power consumption 1. Open Device Manager, and then expand Universal Serial Bus controllers. 2. Double-click USB Root Hub. 3. Click the Power Management tab to view information about power consumption.

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When you install a USB device and an appropriate driver exists in the Driver.cab file, the device is configured without the operating system requesting a device driver. However, some USB devices might not be supported with Windows XP Professional drivers. When you attempt to install an unsupported device, Windows XP Professional prompts you for the appropriate driver. When prompted, select the location on removable media that contains the drivers supplied by the device manufacturer drivers. You can optionally specify a network location.

Part II:

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The fact that a USB device functions properly in Microsoft Windows 98 or Microsoft Windows 2000 does not guarantee problem-free installation in Windows XP Professional. Some USB devices might stop functioning if you upgrade to Windows XP Professional without updating drivers. Be sure to verify that USB peripherals are listed in the Windows Catalog, or that the driver supplied by the manufacturer is compatible with Windows XP Professional.

options, which will help narrow the search. You can further narrow the search to certain folders (click the Browse button to select folders) and to messages that are flagged and/or have attachments. If you select multiple criteria, only messages matching all the conditions will be found. If you don t receive any matches but believe the message you re looking for is in your folders somewhere, try making the search more general.

The USB error detection and correction scheme uses WMI event-driven architecture to resolve errors. The interface notifies the user when a problem occurs on the bus, gives information about the error, and suggests solutions. When the user clicks on an error message, a dialog box appears that shows the following:

A description of the error condition. The tree-view, which is a topological view of the bus. The tree is expanded so that the device in question is displayed, selected, and appears in boldface type. A recommended user action, which depends on the current topology of devices on the bus.

The following six error conditions reported for USB devices result in messages that give error descriptions, and some also give troubleshooting advice:

To search for people s e-mail addresses or other information on the Internet (or in your domain s Active Directory), see Configuring a Directory Service Account, page 188.