User`s guide

22 • Operation Theorem
4
Operation Theorem
The operation theorem of the functions on PCI-9111 card is described in
this chapter. The functions include the A/D conversion, D/A conversion,
Digital I/O and counter / timer. The operation theorem can help you to
understand how to manipulate or to program the PCI-9111.
4.1 A/D Conversion
Before programming the PCI-9111 to perform the A/D conversion, you
should understand the following issues:
•
A/D conversion procedure
•
A/D signal source control
•
A/D trigger source control
•
A/D data transfer mode
•
A/D Pre-trigger function
•
Interrupt System (refer to section 4.2)
•
A/D data format
Note: Because some of the A/D data transfer modes will use the
system interrupt resource. The users have to understand the
interrupt system (section 4.2) at the same time.