12-20-2011 03:03 PM
I have looked through the documentation for the NI 9881, but have not found any mention of the meaning of the two LEDs. Does anyone know what they mean?
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12-21-2011 01:42 PM
Please review the XNET Hardware Manual found here:
http://www.ni.com/pdf/manuals/372840c.pdf
See page 3-16
NOTE: XNET means underlying driver components used by CANopen as well.
12-22-2011 07:11 AM
I don't think XNET and CANopen use the same LED definitions.
The CANopen LED usage is documented in the CANopen spec, part 3 "Indicator specification".This should be available on the web.
Key experpts:
One LED shall be red and shall be labeled as ERR LED. This LED shall be called theerror LED
The other LED shall be green and shall be called and labeled as RUN LED.
Mandatory ERR LED table:
ERR LED State Description
Off No error The device is in working condition
Single flash Warning limit reached At least one of the error counters of the CAN controller has reached or exceeded the warning level
Double flash Error control event A guard event (NMT-slave or NMTmaster) or a heartbeat event (heartbeat consumer) has occurred
On Bus off The CAN controller is bus off
Mandatory Run LED table:
CAN Run LED State Description
Blinking PREOPERATIONAL The device is in state PREOPERATIONAL
Single flash STOPPED The device is in state STOPPED
On OPERATIONAL The device is in state OPERATIONAL
12-22-2011 09:22 AM
Does anyone know if the LED states can be read programmatically? (e.g. to tell if the CANopen bus power is present)