Appendix B
Troubleshooting and Common Questions
B-2
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4.
Make sure that you select the correct parallel port information,
including the name of the parallel port (such as
lpt1
), its type
(unidirectional, bidirectional, or EPP), and its interrupt level.
To determine what type of parallel port you have, refer to the
documentation that came with your computer.
•
If you do not know what type of parallel port you have, select
unidirectional to run
ibdiag
. Unidirectional communication
works on all types of parallel ports. You can then use
ibdiag
to
determine whether your parallel port is capable of either
bidirectional or EPP communication.
•
If you do not know the interrupt level of your parallel port, select
No Interrupt
to run
ibdiag
. Typically, interrupt level 7 is
associated with
lpt1
and interrupt level 5 is associated with
lpt2
. You can then use
ibdiag
to determine whether you can use
interrupts with your parallel port.
5.
Check the parallel port cable connection. The cable should be shielded
and no longer than 2 m. If you need a parallel cable, contact National
Instruments.
Troubleshooting wibtest Errors
If
wibtest
returns an error message, complete the following steps:
1.
Make sure that your GPIB-1284CT is not connected to a GPIB device.
2.
Make sure that your GPIB-1284CT is powered on.
3.
Make sure that the READY LED is lit. If not, either the software is not
installed or configured properly, or the cable connection between your
computer and your GPIB-1284CT is not secure.
4.
Make sure that your Windows directory (usually
c:\windows
)
contains the
gpib.dll
and
gpib.ini
files. If the files are not in your
Windows directory, reinstall the NI-488.2 software.
5.
Make sure that your GPIB-1284CT passes
ibdiag
successfully.
6.
Make sure that the NI-488.2 software is configured properly by
running
wibconf
. Specifically, make sure that the Use this GPIB
interface, Parallel port number, Type of parallel port, and
Interrupt Level fields are correct. For more information about
wibconf
, refer to the
Configure the NI-488.2 Software
section in
Chapter 3,