Owner's manual

Chapter 4: PowerDAQ Software
49
DIO Channel List
There are two channel list modes available on the PowerDAQ DIO
boards:
• continuous unlimited length channel list
• fixed length channel list
First option provides most flexible solution, available on the market, to
the customer. In this case, every output sample is accomplished by
read/write port number. The only trade-of is a performance limitation
(500KS/sec upstream / downstream maximum). This mode is turned
on by disabling AIB_FIXEDDMA flag in _PdAcquireBuffer function call.
Second option is available when higher input/output rates (up to
1600KS/sec) are required. In this case, only 1/2/4 or 8 sequential
channels in the channel list are available for the streamed I/O
operation. Acquisition may be started from any available on the DIO
board ports. Example: channels 3/4/5/6 are acquired in the co-called
DMA buffered mode on the PD2-DIO-64ST board. In this case channels
0,1,2,7 are still available for the non-buffered operation.
The Channel List is a powerful feature of the PD2/PDL/PDXI-DIO board
when properly used by user application.
Note Both channel list modes may be combined with any of
the buffered I/O modes available.