Advantech iDAQ-900 Series, User Manual

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iDAQ-900 User Manual 18
3.3 Analog Input
Insert an iDAQ module supporting analog input function to perform analog input mea -
surement. The following sections describe the analog input acquisition mechanism.
For detailed specifications of the analog input functions, please refer to the document
of the individual iDAQ module.
3.3.1 Instant Analog Input Acquisition
With instant analog input acquisition, the software controls the sample timing. The
analog-to-digital converter (ADC) is continuously converting analog input signal by its
maximum allowable conversion rate. Each time the software sends a “read instant
analog input sample” command, the most recent conversion result is sampled as
shown in Figure 3.4.
Figure 3.4 Instant analog input acquisition