Guralp Systems CMG-DM24S12AMS - Manual (Page 29)

CMG-DM24S12AMS Operator's guide
Mux Channels
Units based on the CMG-DM24 digitiser provide a range of 16-bit, 4 Hz
auxiliary channels for reporting the system's state of health and other
diagnostic information, known as multiplexed (“Mux”) channels.
In the stand-alone configuration, three of these are used to report the
sensor mass position, another for receiving calibration signals, and a
fifth for measuring the internal temperature of the digitiser. There are a
further three channels available at the time of manufacture for user-
specified optional features, such as pressure monitoring, borehole
orientation, etc., making eight factory-set Mux channels in all.
In addition to these, each digitiser provides eight Mux channels for the
user's own purposes. Mux channels for both internal digitisers can be
accessed through the DM24S12AMS's AUXILIARY port.
The collection and transmission of these environmental channels is
controlled using the Mux Channels pane:
If a tick is placed in the box next to a channel, its data will be collected
and transmitted as a data stream in GCF format, just as with the normal
data channels. To indicate that the data comes from a Mux channel, the
Stream ID will take the form ****Mx, where M stands for Mux and x is
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