Synchronize AI with position (from encoder) by Counter (DAQ-STC on PCI6052E, C/C++)

[Heuristics]

Hello,

we use an encoder with 6000 steps to known the position of an analog acquisition in 60 Hz with PCI6052E.
Our problem: we must set any analog acquisition (set by clock of the card in Hz) and to known at every acquisition the position (from encoder) given by the counter:
How to get both values synchronized
(ie, by array: AI1->pos1, AI2->pos2 and not AI1->pos2 because of delay of Windows NT)?

Windows NT is not real-time, that we believe we cannot synchronize by soft. Any idea by hard?

Thanks a lot,
Alain

[kaba]

Hi, Alain

You could use the encoder output pulses as an external scanclock for your AI operation. To do this you need to wire the encoder output to the PFI7/STARTSCAN and configure the AI acquisition for external scan clock. (See the SCANsingleBufExtScan_Eseries.C example program that comes with Ni-DAQ.) This way you sample the AI channels every time you get a pulse from the encoder.