Guralp Systems CMG-DM24 - Manual (Page 70)

CMG-DM24
Sets the pre-trigger recording time, where time is the number of
seconds of buffered data to output from before a trigger is declared.
POST-TRIG
Syntax: time POST-TRIG
Sets the post-trigger recording time, where time is the number of
seconds of data to output after a trigger condition lapses. If an event
persists for some time, all triggering components must fall below the
threshold before the trigger condition will lapse; only then will the
post-trigger period begin.
TRIGGERIN
Syntax: TRIGGERIN ENABLE | TRIGGERIN DISABLE
Enables or disables external trigger input, in instruments equipped
with this option.
Enabling external trigger input allows you to trigger the DM24 from an
external logic level supplied through its digital output port. This
voltage can be between 5 and 10 V supplied between the Trigger In pin
and signal ground. If the DM24 is triggered externally, it will behave
exactly as if it had generated the trigger itself, other than relaying the
trigger (see TRIGGEROUT, below).
TRIGGEROUT
Syntax: TRIGGEROUT ENABLE | TRIGGEROUT DISABLE
Enables or disables external trigger output, in instruments equipped
with this option.
Enabling external trigger output allows you to trigger other equipment
through a relay contained within the DM24 whenever it triggers. The
DM24's digital output port contains two pins (Trigger out, common and
Trigger out, normally-open) which are connected when it triggers. In
particular, you can connect a second digitizer with TRIGGERIN
ENABLE in effect, in which case triggered data from both instruments
will be transmitted whenever the DM24 triggers.
If a DM24 has both TRIGGERIN ENABLE and TRIGGEROUT ENABLE in
effect, only triggers which the DM24 itself has generated will be
output. Triggers received through the Trigger in port will cause the
DM24 to output triggered streams, but will not be passed on to other
digitizers, in order to prevent trigger loops.
70 Issue N