Contec AO-1604CI2-PCI, Руководство пользователя

Страница: 59 / 85

4. Functions
52
AO-1604CI2-PCI
Repeat
You can specify a repeat count to perform sampling for a specified number of times.
Memory must be set to ring format if a number of repetitions is to be specified.
(The number of repetitions cannot be specified for FIFO memory format.)
The number of repetitions is set by software and sampling is repeated for the specified number of times.
You can also specify that operation continue indefinitely. If set to repeat indefinitely, analog output
operation is stopped by outputting a analog output stop command by software.
Event
”Event” works as a function for reporting the occurrence of a certain board state to the application.
The following events can be used in combination depending on the specifications and purpose of the
application.
- ”Sampling start condition satisfied” event
This event occurs when the sampling start condition is satisfied. The event is nullified when the
sampling conversion start condition is “software”.
- ”Sampling stop condition satisfied” event
This event occurs whenever the sampling stop condition is met if the number of repetitions has been
set.
- ”End of device operation” event
This event occurs when the analog output operation is terminated.
- "Specified number of output samples complete" event
This event occurs when DA conversion is executed for the specified number of times. When the
memory type is FIFO, the event occurs only once during sampling. When the memory type is
RING, the event occurs as many times as the number of repetitions.
- Sampling clock error event
This event occurs when conversion stops as an error occurs due to a sampling clock period that is
too short.
- DA conversion error event
This event occurs when the analog output operation stops upon detection of a device malfunction by
the driver.
Starting/Stopping Operation
Analog output operation is started by a software command (the analog output start command).
Similarly, you can stop analog output at any time using a software command (the analog output stop
command).