PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 51
Notes:
1. In general trigger mode, both 8254 timer 0 and software triggers are treated as AD trigger signals. In this
mode, 8254 timer 0 and software trigger should not work at the same time!! This means users should not
generate the software trigger while 8254 timer 0 is activated.
2. In external clock trigger mode, external trigger input is taken as the AD trigger signal. An event of the external
trigger input fall (falling edge) will generate one AD trigger.
3. The pre-trigger mode is used for pre-trigger method. The mode is incorporated with the 8254 timer 1. First,
setup 8254 timer 1 properly. Then set the trigger mode to pre-trigger. Once pre-trigger mode has been activated,
the 8254 timer 1 will automatically turn on and start to perform AD triggers. It will continue until the AD trigger
logic receives a falling external trigger signal. Any change to the trigger mode selection will turn off the
pre-trigger mode.
4. The post-trigger mode is used for post-trigger method. The mode working incorporated with the 8254 timer 1.
First, setup 8254 timer 1 properly. Then set the trigger mode to post-trigger. Once post-trigger mode has been
activated, the 8254 timer 1 will automatically turn off until it receives a falling external trigger signal. Any change
to the trigger mode selection will turn off the post-trigger mode.
5. The AD trigger is set to 0 after either power-on or hardware reset.
