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Appendix B
Troubleshooting and Common Questions
©
National Instruments Corporation
B-13
NI-FBUS Hardware and Software User Manual
NI-FBUS Software
This section contains information about how to identify and solve problems
with the NI-FBUS Communications Manager software.
Startup Problems
If the NIFB process is unable to find the information it needs to start up,
error messages will appear. You may ignore these messages and continue;
however, this will result in your application not being able to communicate
with the interface devices for which the error messages appeared. These
messages tell you the information that the NIFB process is looking for
but cannot find.
If NI-FBUS is unable to connect to and initialize an interface device,
and you decide to continue NI-FBUS startup, NI-FBUS will not try to
reconnect to that interface again. This is true of all interface types supported
by this software.
If a USB-8486, PCMCIA-FBUS, or PCI-FBUS interface is configured
as a basic device, a link master device must be present on this link before
NI-FBUS will start up.
Call to Open Session Fails
If the call fails, ensure that your NI-FBUS Communications Manager
process is running and that it has not displayed any error message boxes
during startup. You can check this by maximizing and looking at the
nifb.exe
console window. If the title bar does not end in “(Running),”
NI-FBUS did not start up correctly.
Set Address Problems
If you are having trouble setting the address of your device, you may
need to change some of the System Management Info parameters in
the
Advanced
settings of your interface port in the NI-FBUS Interface
Configuration utility. The parameters involved in setting addresses are
T1 and T3. These parameters represent delay time values that your
interface card uses to compensate for the delays inherent in the device
and in the set address protocol itself.
T1 is a parameter that describes the expected response delay of the device
at a given address. Normally, you will not need to increase this parameter;
however, if it appears that your interface card is not seeing the device
responses related to setting addresses, you can increase this value. The