ADLINK PCI-9810 - Manual (Page 45)

Operation Theory 33
specified trigger level to a voltage that is higher than the speci-
fied trigger level.
Z Negative-slope trigger
The trigger event occurs the first time the trigger signal (analog
input signal) changes from a voltage that is higher than the
specified trigger level to a voltage that is lower than the
specified trigger level.
Z External Digital Trigger
An external digital trigger occurs when a rising edge or a falling
edge is detected on the digital signal connected to pin3 of JP1
for external digital trigger.
X Simultaneous trigger for multiple cards
When multiple PCI-9812/9810 cards are installed in a single
system, the trigger sources of each card may be connected
together to achieve simultaneous trigger. Note that simulta-
neous trigger is not equivalent to simultaneous A/D conversion.
The theoretical time difference between the samples on two
different cards will be ½ of the clock period. Refer to section 5.4
for more information on A/D conversion clock control.