My periodic tasks don't look so periodic on the bus monitor.

My periodic tasks don't look so periodic on the bus monitor. Is it possible the bus monitor is reporting incorrect rates or are my frames really not being sent very close to periodically? Are there only certain multiples of a base rate than can be sent periodically? The attachment shows my different rates. I've written in the middle of the columns what they should be. Some are fairly close, some are not. Am I doing something wrong? Thanks for any help/advice.
Robert C. Mortensen
Certified LabVIEW Architect
Certified LabVIEW Embedded Systems Developer
Endigit
Attachments:
CAN Bus Timing.PNG ‏44 KB

Hi Chris,
Thanks for responding. I've attached an image of my LabVIEW code setting up and executing the periodic messages. I'm doing a simple loopback to read what I'm sending out on the other port. The code is executing without error; I was just wondering if it is normal for hardware-timed periodic messages to be so erratic. I would have imagined that if the CAN transciever is sending out buffered data at intervals specified by the on-board clock the messages would appear more deterministically timed.
I appreciate your efforts to keep these forums monitored. I know these questions can be pretty random.
Robert C. Mortensen
Certified LabVIEW Architect
Certified LabVIEW Embedded Systems Developer
Endigit
Attachments:
Periodic CAN.PNG ‏16 KB

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~~~~
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Edited by: Prashant U. Maid on Dec 5, 2008 5:28 AM

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Robert C. Mortensen
Certified LabVIEW Architect
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Endigit

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Attachments:
CAN_Multi-Chans_Diff-Period.vi ‏26 KB

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