Change encoder output count

Hi All,
Anyone know how to change the encoder count for an PCIe-8255R on the fly in C++?
The following call sets up the output pulse at 40 encoder ticks after the trigger input and works fine.
RetVal = imaqIOPulseCreate(m_id,
IMAQIO_TIMEBASE_ENCODER_TICKS, 40, //Encoder count IMAQIO_TIMEBASE_MICROSECONDS, 100, //Pulse width IMAQIO_SIGNAL_ISO_IN, 8, IMAQIO_POLARITY_HIGH_TRUE, //Trigger from TTL8 IMAQIO_SIGNAL_TTL_OUT, 2, IMAQIO_POLARITY_HIGH_TRUE, //output on TTL2 IMAQIO_PULSE_MODE_SINGLE_REARM, &pulseID2); //single shot, requires trigger
What I need to do is to change the IMAQIO_TIMEBASE_ENCODER_TICKS value within my program WITHOUT stopping the Pulse Train.
E.G.
This encoder output fires at 40 on this rotation, then the next at 45 then 50...
The imaqIOSetAttribute function in the help says that it's not implimented so I can't use that. Any other way of doing this??
Thanks in advance,
DJack

Hi DJack,
I have looked into this for you and unfortunately our C API is not as flexible as our LabVIEW API (since it's possible to achieve this in there, I assumed that might be the case in C as well). There is no
way to dynamically change the pulse properties. If you call the Pulse
Create function again, it will actually stop the pulse and you will
have to call start again. So you don't, necessarily, have to call the dispose function,
but will still need to call the start function to set it back up and get it ready. Hopefully, that is much faster. I apologize for the bad news and wish you luck with your application. Please let me know if there is anything else I can help you out with.
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

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