ADLINK DAQe-2214 - Manual (Page 81)

Operation Theory 69
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 4-35: External Digital Trigger