CMG-DM16
4.3 Setting the channels running the trigger
algorithm
The filtering and triggering can be carried out on 1, 2 or 3
channels, usually corresponding to the 3 components of a
seismometer. The channels to be used are specified using the
command
TRIGGERS
. A trigger on any defined channel will
cause the system as a whole to declare a trigger. The
argument for the
TRIGGERS
command is an integer specifying
with its binary bits which components to enable: 1 (001) for the
first component (channel 0, vertical), 2 (010) for the second
component (channel 1, N/S) and 4 (100) for the third
component (channel 2, E/W). So, for example, to enable
triggering on all three components:
001+010+100 = 111 = 7
The command is:
7 triggers
This returns the configuration report:
Triggering on Data from:
Tap#2 20s/s 70 = Chans 4 5 6
Tap#2 20 s/s BandPass: 2.0->9.0Hz
(Note: Channels 4, 5 and 6 correspond to the bandpassed
versions of data on Channels 0, 1 and 2)
The trigger operating mode can be disabled simply by sending
the command:
0 triggers
4.4 Setting the triggered output channels
When a trigger is declared, the channels to be output are
defined using the
TRIGGERED
command. This takes 2
arguments, the tap number (0-3) and the components (an
integer defined from the bit values as for
TRIGGERS
defined
above). For example:
0 7 triggered
will cause all three components to be output at 200 s/s on
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Issue C
Summary of Contents for CMG-DM16R8
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