Guralp Systems CMG-3ESPCD - Manual (Page 67)

CMG-3ESPCD Digital Broadband Seismometer Command line interface
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.
6.4.8 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 digitiser 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 digitiser is triggered externally, it will behave exactly as if it had
generated the trigger itself.
6.4.9 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 digitiser whenever it triggers. The
digitiser'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 digitiser with TRIGGERIN ENABLE in
effect, in which case triggered data from both instruments will be transmitted
whenever the digitiser triggers.
If a digitiser has both TRIGGERIN ENABLE and TRIGGEROUT ENABLE in
effect, only triggers which the digitiser itself has generated will be output.
Triggers received through the Trigger in port will cause the digitiser to output
triggered streams, but will not be passed on to other digitisers.
6.5 Calibration
These commands are all concerned with calibration.
6.5.1 SINEWAVE
Syntax: component freq­or­period unit SINEWAVE
Instructs the digitiser to inject a sine-wave calibration signal, starting on the
zero crossing.
The argument component specifies which component is to be calibrated, one
of Z, N/S, E/W, or X. Some sensors use only the Z calibration loop for all
three components.
MAN-C3E-0002 67 Issue B - November 2013