Figure 4-37: external digital trigger – ADLINK PXI-2208 User Manual
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Operation Theory
External Digital Trigger
An external digital trigger occurs when a rising edge or a falling
edge is detected on the digital signal connected to the EXT-
DTRIG or the EXTWFTRG of the 68-pin connector for external
digital trigger. The EXTDTRIG is dedicated for A/D process,
and the EXTWFTRG is used for D/A process. You can program
the trigger polarity using the software drivers. Note that the sig-
nal level of the external digital trigger signals should be TTL-
compatible and the minimum pulse is 20 ns.
Figure 4-37: External Digital Trigger