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Chapter 5
PCI-1712/1712L User’s Manual
Advantech Co., Ltd.
www.advantech.com
Figure 5-5: PCI-1712/1712L Sample Clock Source
Trigger Sources
The PCI-1712/1712L supports the following trigger sources for post-,
delay-, about- and pre-trigger acquisition modes:
w Software trigger,
w External digital (TTL) trigger, and
w Analog threshold trigger.
With PCI-1712/1712L, user can define the type of trigger source as
rising-edge or falling-edge. These following sections describe these
trigger sources in more detail.
q Software Trigger
A software trigger event occurs when you start the analog input
operation (the computer issues a write to the board to begin acquisi-
tions). When you write the value to analog input trigger flag AI_TRGF
on Write BASE+6 to produce either a rising-edge or falling-edge
trigger, depending upon the trigger source type you choose. This edge
will then act as an A/D trigger event. For detailed information, please
refer to Appendix D.7 A/D Control/Status Register.
q External Digital (TTL) Trigger
For analog input operations, an external digital trigger event occurs
when the PCI-1712/1712L detects either a rising or falling edge on the
External A/D TTL trigger input signal from screw terminal AI_TRG on