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Appendix D Troubleshooting and Common Questions
Serial Hardware and Software for Windows D-6 ni.com
Windows Me/9x
Freeing an Interrupt Request Level
To free an interrupt request level for your serial port, you must disable the
device that is using the interrupt request level. To view the system-wide
allocation of interrupt request resources and remove a device, complete the
following steps:
1. Select Start»Settings»Control Panel and double-click on the
System icon.
2. Click on the Device Manager tab.
3. Double-click on the Computer icon and click on the View
Resources tab.
4. ClickontheInterrupt Request (IRQ) button. Scan through the list of
IRQ settings to determine which devices are using which interrupt
request levels.
5. When you locate a device that you are not currently using, click on the
Cancel button.
6. In the Device Manager tab, double-click on the icon for that device.
7. In the Device usage field, acheckmark appears to the left ofthe current
configuration, usually Original Configuration (Current).Clickon
the checkbox to remove the checkmark.
8. ClickontheResources tab and makesure that Use automatic settings
is unchecked.
9. Repeat steps 7 through 9 for each unused device.
10. Click on the OK button to save your changes.
11. Restart Windows Me/9x to assign resources to your serial port. Then,
complete step 6in the installation verification section of the chapter for
your hardware platform.