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Chapter 5
PCI-1712/1712L User’s Manual
Advantech Co., Ltd.
www.advantech.com
Figure 5-1: Post-Trigger Acquisition Mode
q Delay Trigger Acquisition Mode
In delay trigger mode, data acquisition will be activated after a preset
delay number of sample has been taken after the trigger event. The
delay number of sample ranges from 2 to 65535 as defined in DMA
counter.
Delay-trigger acquisition starts when the PCI-1712/1712L detects the
trigger event and stops when the specified number of A/D samples has
been acquired or when you stop the operation. This triggering mode
must work with the DMA data transfer mode enabled
Please specify the following parameters when using software in delay
trigger mode:
w Set to Delay-Trigger Acquisition Mode
w The sample clock source and sampling rate
w The trigger source and edge type
w The acquired sample number N
w The sample number M delays after the delay-trigger event hap-
pened
Figure 5-2: Delay-Trigger Acquisition Mode
q About Trigger Acquisition Mode
Use about-trigger acquisition mode when you want to acquire data
both before and after a specific trigger event occurs. This operation is
equivalent to doing both a pre-trigger and a post-trigger acquisition.
When using software, please specify the following parameters, when
using software in About-Trigger acquisition mode:
Trigger Event
Acquired number of samples N
N-2th N-1th Nth
t
1st 2nd 3rd
Trigger Event
Delay time M:
from 2 to 65535 samples
Acquired number of samples N
t
1st 2nd 3rd
M-2 M-1 M
1 2 3
N-2 N-1 N