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Infinite non-loop output mode
The infinite loop output mode refers to a waveform in which the DO output exceeds the length of the
hardware FIFO space, and the computer transfers the data in batches to the DO hardware FIFO.
For example, a waveform with a length of 1M point needs to be output at a sampling rate of 10kSa/s,
and the DO hardware FIFO space is only 2k points, so the waveform of 1M point length needs to be
transferred to the DO hardware FIFO in 500 times. The 2k point data in the hardware FIFO, with an
output sampling rate of 10kSa/s, can be transmitted in 0.2 seconds. Therefore, the computer must
start a new data transmission in less than 0.2 seconds to ensure the continuity of DO output
waveform.
When the waveform output in the hardware FIFO is complete and no new data arrives, the DO
output level state will remain at the level defined by the last point.
5.2.
Output update rate
PCI-5000 series data acquisition device DO output update rate can reach up to 10MSa/s/Ch.
5.3.
Trigger
The PCI-5000 series of data acquisition devices provide a rich set of trigger options, as shown in
Figure 5.1, which describes trigger options for the DO output.
AiSoftTrig software trigger
DoSoftTrig software trigger
AoSoftTrig_0 software trigger
AoSoftTrig_1 software trigger
DoSoftTrig software trigger
Globa software trigger
Trig_IN external trigger input
DO trigger signal
Figure 5.1 DO trigger options
The DO output uses the channel exclusive software trigger signal DoSoftTrig as the trigger source by
default. You can set DO output to use other trigger sources to achieve the synchronization of each
function via software settings.
Software triggering means that the computer sends a command to the acquisition device to achieve
the effect of device triggering.
Trig_IN external trigger means that when Ext_Trig_IN receives a rising edge, the device triggers.
Clear trigger
Trigger status can be reset to an untriggered state via software settings.
