Model 302
24-bit USB Data
Acquisition System
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Polled Mode Overview

In polled mode, individual conversions are requested with individual commands. Other commands set the analog outputs or digital outputs, change input channels, recalibrate the system, or change to scanning mode. The offset correction channel is designated as channel 7. The full scale calibration channel is designated as channel 6. The six available analog input channels are called channels 0 through 5. Note that labels on the board itself are 1 through 6, etc. The assumption is that from a developer or programmer's perspective, zero-based references are more appropriate, but that the user would prefer counting to start from 1.
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