Appendix D
Troubleshooting and Common Questions
PCMCIA Serial for Windows 95
D-4
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National Instruments Corporation
What do I do if the diagnostic test fails with an error?
Refer to the troubleshooting sections of this manual for specific
information about what might cause the test to fail.
How can I determine which port is associated with COMx?
Refer to the section
Determine Which Physical Port Is Associated with
Chapter 2,
How can I name National Instruments serial ports COM1, COM2,
COM3, or COM4?
Table D-1 lists standard DOS-base addresses for serial ports.
In most cases, Windows 95 does not assign names COM1 through COM4
to the serial hardware. Rather, it names the ports starting with COM5. If
you assign any of the base addresses in Table D-1 to a National Instruments
serial port, Windows 95 automatically changes the COM port name to the
corresponding one listed in this table. You do not need to change the IRQ
setting for this name change to occur. To change the base address, refer to
the
Selecting Conflict-Free Resources
section earlier in this appendix.
How do I change the resources assigned to PCMCIA two-port or
four-port serial cards?
Because the two-port PCMCIA cards are single physical devices that
support multiple ports, they are registered as "multi-function adapters" in
the Device Manager. Each port is a child device listed under Ports (COM
& LPT). Windows 95 does not allow the resources of the multi-function
child devices to be changed directly.
To change the resources of ports on two-port PCMCIA cards from within
the Device Manager, you must open the Multi-function adapters class and
Table D-1.
Standard DOS-Based Addresses
COM Port
Base Address
COM1
3f8
COM2
2f8
COM3
3e8
COM4
2e8
