Guralp Systems CMG-DM24 - Manual (Page 68)

Operator’s Guide DM-24 Digitiser
Issue G January 2003 66
DEFINING CHANNELS RUNNING 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