Fpga - C-RIO CAN erroneous ID messages

Question

Hi all, I'm using the ni 9853 c-module for acquiring messages from an industrial motor with j1939 protocol.
If acquire on the can port with a pcmcia can board everithings goes fine. If acquire from the crio module all the messages have an ID with an offset of 2^29.
It seems impossible (the sja1000 controller manage id from 0-2^29) but it appens. I did not use any processing sw, I only acquire the can frame both as cluster or ar 6xU32 variable and the problem remains.
It seems that an offseto of 2?29 is added to the right message ID after it is acquired. But if I try to hw-filter (with mask) anyone message I do not receive anything so this "offset" seems to be in the between the hw controller and the hw processor.
What can I do for avoiding this?
bye
Vittorio

Answer 1

Hi SHV,
actually I don't know in which context you want to use your existing hardware for your stepper motor.
1. The hardware, which you describe, is/was used for which application? ( data acquisition, controlling a system, etc)?
2. Did you buy the hardware especially for the motor application?
3. You don't know how which signals are required for your stepper motor.
Here are some basics from NI about motor control
Fundamentals of Motion Control
http://www.ni.com/white-paper/3367/en
NI Motion Control Technical Library
http://www.ni.com/white-paper/3054/en
4. Why do you get the idea the digital output module 9474 is suitable for the stepper motor?
I would recommend to talk directly to the customer support, so we can figure out in detail your aims about
the application. Contact your local NI office or request
a service request on following website:
Service Request Manager
https://sine.ni.com/srm/app/login/p/tab/getassistance
Kind regards,
RupiDo