ADLINK DAQe-2006 - Manual (Page 87)

Operation Theory 75
Note that when power-up or reset, the DAQ timing signals are
reset to use the internal generated timing signals.
AI_Trig_Out and AO_Trig_Out
AI_Trig_Out (or AO_Trig_Out) is the signal output following one of
the four trigger sources: software trigger, analog trigger, digital
trigger, and SSI trigger selected by the user. That is, AI_Trig_Out
follows the A/D trigger source, and AO_Trig_Out follows the D/A
trigger source. These two signals can be used to control external
peripheral circuits or boards, or can be used as synchronization
control signals. The signal level of the AI_Trig_Out and
AO_Trig_Out are TTL-compatible.
NOTE AI_Trig_Out and AO_Trig_Out are output pins on J5 (68-
pin VHDCI). Connecting them to any signal source may
cause permanent damage to the card.