Using The Labwindows / Cvi Driver; Figure 5-11, Front Panel Inputs Configuration Window - Astronics PXIe-1209 User Manual

Publication No. 981050 REV. A
The Front Panel Inputs configuration window is shown below:

Figure 5-11, Front Panel Inputs Configuration Window

This window provides the ability to program the input thresholds for the IN 1 A and
IN 1 B front panel inputs (for PGEN 1) or the IN 2 A and IN 2 B front panel inputs
(for PGEN 2). It also allows the user to set the hysteresis voltage. This panel
provides the means to set the threshold DACs directly, but that feature is generally
used for calibration and / or troubleshooting and is generally not needed.
The Calibration window is not shown as this is intended for use primarily for factory
calibration.
The Auto-Update window allows the user to set how often the main front panel is
refreshed. In order for this value to have any effect, the "Auto" checkbox on the
main front panel, next to the "Update" button, must be checked.
The Frequency Generation Mode menu item allows the user to select how the
pulse frequency is derived. It may be "Auto", "DDS", or "DDS and Divider". In
general, this should be left in "Auto" mode.

Using the LabWindows / CVI Driver

The LabWindows / CVI driver provides a 'C' language programming interface.
This driver also includes a 32-bit and 64-bit DLL that can be used within various
programming environments such as Microsoft Visual Studio C++ and C#.
The first step to using any of the functions in the driver is to call the "ri1209e_init()"
function. This function takes the VISA descriptor that identifies which instrument is
being accessed and returns a "handle". All of the other functions in the driver use
this handle.
The last step in using the driver is to call the "ri1209e_close()" function. Each time
you make a call to the "ri1209e_init()" function, it returns a new handle and
allocates some memory for that driver session. Calling the "ri1209e_close()"
functions releases the memory and resources associated with the handle.
Astronics Test Systems
PXIe-1209 User Manual
Operation 5-9