Advantech PCIE-1805, Руководство пользователя, Страница: 38 / 42

PCIE-1805 User Manual 32
 Delay to Start Trigger Acquisition Mode
In delay to start trigger mode, data acquisition will be activated after a preset
delay number of CONV CLKs has been taken after the trigger event. User can
set the delay number of CONV CLKs by a 24-bit counter. Delay to start trigger
acquisition starts when the PCIE-1805 detects the trigger event and stops when
you stop the operation.
 Delay to Stop Trigger Acquisition Mode
If you want to acquire data after a specific trigger event occurs, then you can
take advantage of the delay to stop trigger mode. First designate the size of the
allocated memory and the amount of samples to be snatched after the trigger
event happens. The about trigger acquisition starts when the first CONV CLK
signal comes in. Once a trigger event happens, the on-going data acquisition
will continue until the designated amount of CONV CLKs have been reached.
When the PCIE-1805 detects the selected about-trigger event, the card keeps
acquiring the preset number of samples, and keeps them on the buffer.
 Stop Trigger Acquisition Mode
Stop trigger mode is a particular application of about-trigger mode. Use pre-trig-
ger acquisition mode when you want to acquire data before a specific trigger
event occurs. Stop-trigger acquisition starts when you start the operation and
stops when the trigger event happens.