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Chapter 2 Function Reference — WFM_Group_Setup
NI-DAQ FRM for PC Compatibles 2-424
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National Instruments Corporation
Using This Function
For the AT-AO-6/10, you can assign analog output channels to one of two waveform
generation groups. Each group has a separate update clock source. You can assign different
update rates to each group by calling
WFM_ClockRate.
Also you cannot split channel pairs between groups (channel pairs are 0 and 1, 2 and 3, 4 and
5, and so on) for the AT-AO-6/10. For example, you can assign channel 4 alone to group 1,
but you cannot then assign channel 5 to group 2.
When you use the AT-AO-6, restrictions on group 1 assignments are as follows:
•0 to n, where n ≤ 5 and the channel list is consecutive, or any one channel.
• Uses interrupts/DMA with FIFO.
• Interrupt when the FIFO is half full; thus, group 1 will be faster than group 2, even when
interrupts are used for both.
• If more than one channel is in the channel list, then channel 0 must be the first channel
in that list.
The restrictions for AT-AO-6 group 2 assignments are as follows:
• Channels 0 or 1 cannot be in group 2.
• Uses interrupts only.
Restrictions on AT-AO-10 group assignments are as follows:
• All rules of assignment for the AT-AO-6 apply to the AT-AO-10.
•0 to n, where n ≤ 9 and the channel list is consecutive, or any one channel.
• If exactly one channel is assigned to group 1, it cannot be channel 8 or 9.