Appendix B
Troubleshooting and Common Questions
NI-FBUS Hardware and Software User Manual
B-6
ni.com
USB-8486 Troubleshooting
The H1 Fieldbus LED flashes red.
The USB-8486 encountered an error during the Power-On Self-Test
(P.O.S.T.). Complete the following steps to correct the issue.
1.
Remove the USB-8486 from the computer and close NI-FBUS
Communications Manager.
2.
Connect the USB-8486 to another USB port in the system.
3.
Start the NI-FBUS Communication Manager.
If the H1 Fieldbus LED still flashes red, contact National Instruments
through the information provided in Appendix C,
.
The H1 Fieldbus LED is solid red.
The USB-8486 H1 Fieldbus port encountered a fatal network error.
Complete the following steps to correct the issue.
1.
Remove the USB-8486 from the computer and close NI-FBUS
Communications Manager
2.
Re-connect the USB-8486 to the USB port of the system again.
3.
Restart the NI-FBUS Communication Manager and check the
H1 Fieldbus LED state.
Configuring Advanced Parameters
Caution
Do
not
modify the
Advanced
parameters without good reason. If you must
modify parameters for certain devices, the device manufacturer will recommend settings.
Modifying these parameters can have an adverse affect on data throughput rates. If settings
are incorrectly modified, some devices might disappear off the bus.
In the NI-FBUS Interface Configuration Utility, click the
Advanced
button
on the dialog box for the port you want to configure. The
Advanced Stack
Configuration
dialog box is shown in Figure B-1.