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Added a couple of sentences about async acquisition and the

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two modes cards do it and then mentioned our new board_info.
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Bernd Porr 2012-05-03 01:24:22 +01:00
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doc/tutorial.xml
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@ -132,6 +132,26 @@
This technique is used in programs such
as <command>ktimetrace</command> or <command>comedirecord</command>.
</para>
<para>
There are two different ways how a sequence of channels is
measured during asynchronous acquisition (see also the Figure in
the introduction):
<itemizedlist>
<listitem>
The channels are measured with the help
of a multiplexer which switches to the next channel after each measurement.
This means that the sampling rate is divided by the number
of channels.
</listitem>
<listitem>
The channels are all measured at the same time, for example
when every channel has its own converter. In this case the
sampling rate need not to be divided by the number of channels.
</listitem>
</itemizedlist>
How your &comedi; device handles the asynchronous acquisition can be found out
with the command <command>comedi_board_info -v</command>.
</para>
<para>
The program <command>tut3.c</command> demonstrates the
asynchronous acquisition. The general strategy is always