Konica Minolta PCI-1712L user manual Analog Input Acquisition Modes

Chapter 5

Analog Input Acquisition Modes

The PCI-1712/1712L can acquire data in single value, pacer, post- trigger, delay-trigger, about-trigger and pre-trigger acquisition modes. These analog input acquisition modes are described in more detail in the followings:

qSingle Value Acquisition Mode

The single value acquisition mode is the simplest way to acquire data. Once the software issues a trigger command, the A/D converter will convert one data, and return it immediately. User can check the A/D FIFO status (A/D_F/E on Read BASE+8) to make sure if the data is ready to be received. For detailed information, please refer to Appendix D.9 Interrupt and FIFO status.

qPacer Acquisition Mode

Use pacer acquisition mode to acquire data if you want to accurately control the time interval between conversions of individual channels in a scan. A/D conversion clock comes from A/D counter or external AI_CLK on connector. A/D conversion starts when the first clock signal comes in, and will not stop if the clock is still continuously sending into it. Conversion data is put into the A/D FIFO. For high- speed data acquisition, you have to use the DMA data transfer for analog input to prevent data loss.

qPost-Trigger Acquisition Mode

Post-trigger allows you to acquire data based on a trigger event. Post- trigger acquisition starts when the PCI-1712/1712L detects the trigger event and stops when the preset number of post-trigger samples has been acquired or when you stop the operation. This trigger mode must work with the DMA data transfer mode enabled.

Use post-trigger acquisition mode when you want to acquire data when a post-trigger event occurs. Please specify the following parameters when using software in post-trigger acquisition mode:

wSet to Post-Trigger Acquisition Mode

wThe A/D sample clock source and sampling rate

wThe trigger source and edge type

wThe acquired sample number N

PCI-1712/1712L User’s Manual	– 34 –	Advantech Co., Ltd.
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