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Appendix B
Troubleshooting and Common Questions
©
National Instruments Corporation
B-11
NI-FBUS Hardware and Software User Manual
H1 Network Status LEDs
Each Fieldbus (H1 Network) port on the linking device has an LED to
indicate the functional states of the port. Table B-4 describes each state.
USB-8486 LED Indicators
The USB-8486 has two LED indicators on the front panel, as shown in
Figure B-3.
Figure B-3.
LEDs on the USB-8486
Table B-4.
Description of Fieldbus Network Status LED States
LED State
Meaning
Off
Fieldbus port is not receiving packets.
Steady green
Fieldbus port is alive as Link Active Scheduler.
Flashing green
Fieldbus port is not alive as Link Active Scheduler.
Flashing red
and green
Fieldbus port is seeing traffic, but is at a default or
visitor address.
Flashing red
Fieldbus port encountered a transient, nonfatal
network error.
Steady red
Fieldbus port encountered a fatal network error.
1
H1 Fieldb
us
Port
S
t
a
t
us
2
U
S
B
S
t
a
t
us
1
2
NI USB-8486
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INSTRUMENTS