Analog Output; Static Analog Output Update; Buffered Analog Output Waveform Generation - Advantech iDAQ-934 User Manual

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3.4

Analog Output

Insert an iDAQ module supporting analog output function to perform analog output

update/generation. The following sections describe the analog output update/genera-

tion mechanism. For detailed specifications of the functions, refer to the document of

the corresponding iDAQ module.

3.4.1

With static analog output update, the analog output voltage or current is updated only

when the software sends an "write static analog output sample" command. The ana-

log output voltage or current remains unchanged at other times. This is shown in Fig-

ure 3.17.

3.4.2

With buffered analog output waveform generation, the DAC conversion rate and the

duration of the generation is controlled by hardware timing signals. The analog output

waveform to be generated are first programmed and stored in the buffer memory in a

digital form. The digital values are converted to analog voltage or current one by one

for each sample clock as shown in Figure 3.18.

Figure 3.18 Buffered analog output waveform generation

iDAQ-934_964 User Manual

Figure 3.17 Static analog output update

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