ADLINK USB-1210 - Manual (Page 37)

Operation & Calibration 27
USB-1210
Figure 3-6: Above-High Analog Triggering
External Digital Triggering
An external digital trigger occurs when a rising or falling edge is
detected on the digital signal connected to the AITG (analog input
trigger) pin. Trigger polarity can be programmed using ADLINK
software drivers.
Figure 3-7: Digital Triggering
3.1.4 Trigger Modes
Analog input supports post, pre, middle, delay, gate, post trigger
with retrigger, and delay trigger with retrigger modes.
WARNING:
Signal level of the external digital trigger signals should be
LVTTL-compatible, with a minimum pulse of 20ns.
Positive-edge (rising)
trigger event occurs
Negative-edge (falling)
trigger event occurs