Schlumberger Reflex 72, Installation Manual, Page: 27 / 36

Troubleshooting
Reflex 72 Reader Installation Guide
23
Cause Description: The COM port is not functional.
Solution:
To verify that the COM port is working properly, use one of these
methods:
•
Perform a loopback test.
•
Test the COM port by connecting another serial device to it.
•
On a Windows 98, Me, 2000, or XP system, open the Device Manager (for
information about how to open the Device Manager, refer to the
documentation for your system), select the COM port, and then click the
Properties
button. Check the port status in the dialog box that appears.
Cause Description:
The COM port you selected on the host Windows NT 4.0
system for the reader may be allocated to another device. (This is less likely to
be the problem than an incorrect setting in the system BIOS.)
Solution:
Check to make sure your system does not have any IRQ conflicts
and check the serial port settings, such as:
•
Address value — If your serial port hardware uses address values other
than the values that Windows NT detects, change the base I/O address.
•
Unique IRQ numbers for multiple COM ports — To use multiple COM
ports simultaneously, assign a unique IRQ number to each COM port.
The method for setting advanced port options is varies somewhat by operating
system. Brief instructions follow for setting port options on a Windows NT 4.0
system. For information about other operating systems, refer to your system’s
Windows help or documentation.
To display the Advanced Settings dialog box on a Windows NT 4.0 system,
follow these steps:
1
Select Start
→
Settings
→
Control Panel , and then double-click Ports
to display the Ports list.
Faulty COM port
COM port allocation or settings (Windows NT 4.0 systems)