ADLINK PCIe-9814 - Manual (Page 28)

18 Operations
source. The PCIe-9814 supports internal software trigger,
external digital trigger, and analog trigger.
3.3.1 Software Trigger
The software trigger, generated by software command, is
asserted immediately following execution of specified function
calls to begin the operation.
3.3.2 External Digital Trigger
An external digital trigger is generated when a TTL rising edge
or falling edge is detected at the SMB connector TRG IN on the
front panel. As shown, trigger polarity can be selected by soft-
ware. Note that the signal level of the external digital trigger
signal should be TTL compatible, and the minimum pulse width
20 ns.
Figure 3-5: External Digital Trigger
3.3.3 Analog Trigger
An analog trigger is generated when AI input signal level is
detected at the SMB connectors CH0 to CH3 (selected by soft-
ware). The trigger level is also selected by software.
Pulse Width > 20ns Pulse Width > 20ns
Rising Edge Trigger Event Falling Edge Trigger Event