Справочник Пользователя для National Instruments 321645c-01
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
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.
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.
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.
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.