ADLINK DAQe-2006 - Manual (Page 46)

34 Operation Theory
Software Conversion with Polling Data Transfer Acqui-
sition Mode (Software Polling)
This is the easiest way to acquire a single A/D data. The A/D con-
verter starts one conversion whenever the dedicated software
command is executed. Then the software would poll the conver-
sion status and read the A/D data back when it is available.
This method is very suitable for applications that needs to process
A/D data in real time. Under this mode, the timing of the A/D con-
version is fully controlled by the software. However, it is difficult to
control the A/D conversion rate.
Specifying Channel, Gain, and Polarity
In both the Software Polling and programmable scan acquisi-
tion mode, the channel, gain, and polarity for each channel can
be specified and selected. With this configuration, signal
sources must be connected to the right connector as the speci-
fied settings.
When the specified channels have been sampled from the first
to the last data, the settings applied to each channel would be
the same until next change.
Example:
Typically you can set the input configuration for different chan-
nels:
Ch1 with unipolar ±10V
Ch2 with bipolar ±2.5V
Ch3 with no signal input (disabled)
Ch4 with bipolar ±1.25V