NI 5431 Composite Video Generator
Generating a Saved Video Signal

Download Video File to NI 5431 downloads a binary video data file, such as the file you saved using the example VI in Saving a Video Signal to Disk, to the NI 5431 and automatically starts generating a video signal. The VI automatically detects the Video type from the size of the file and adjusts the pixel frequency to the Video type.

You can access this example VI by selecting Functions»Video Generation»Generator Examples»Download video file to NI 5431.

To generate a saved video signal, complete the following steps:

1. Launch the example VI.
2. Make sure the module ID value matches the value assigned by the MAX during configuration of the module.

The Output Level should be set to the default analog output level corresponding to the generated video format. The default analog output level is set to 7.000 mV/IRE, which is the normal value for all formats except NTSC, M-PAL, and N-PAL. For these three video formats, the default value should be 7.143 mV/IRE.

Caution  Be careful if modifying the Output Level. For example, the NI 5431 can output up to 5 V in a 75 Ω load, potentially resulting in the destruction of the DUT.

3. Run the VI. A Video bin file? dialog box appears, prompting you to select a subdirectory that is storing the binary video data file to be downloaded.
4. Double-click the Video data files shortcut to access the appropriate subdirectories.
5. Select the next subdirectory based on the video format of the binary video data file you want to download.
6. Double-click the .bin file you want to download.

A saved video signal downloads to the NI 5431 and the video signal starts generating.

DigiSync enables or disables the digital output data lines on the module.

Note  Select enabled in DigiSync only if the application needs the four TTL video synchronization signals.

When you select enabled in DigiSync, the VI inserts four digital synchronization signals in order—composite sync (Csync), horizontal sync (Hsync), vertical sync (Vsync), and field identification (Field ID)—into the four least significant bits of the video data. The video data is created and/or saved as 16-bit data, but only 12 of these bits are used to generate the analog video signal. When you create the four digital synchronization signals, it does not affect the analog signal quality.

Note  Refer to (VIDEO) DIG Out Connectors for more information on the location of these TTL signals on the digital output connector of the NI 5431.

Note  The example VI in Saving a Video File to Disk does not include the synchronization signals in the saved file.

When the VI runs, the video format of the binary video data file is detected and displayed in detected video format.