Guralp Systems CMG-DM24 User Manual

Page 98

CMG-DM24

Any signal between +3 and +30 V referenced to power ground

(pin A) can be used. The instrument's own power supply (pin B)
could be connected via a relay to supply this signal, for

example.

The Trigger Out pins are not connected if you provide a Trigger In
voltage. The instrument must trigger itself for the relay to switch. This

arrangement prevents any trigger loops from occurring.

The diagrams on this page show the additional connections you will
need to make. Pins A and B, and the data pins, should be connected to

your power and data systems as normal.

Triggering your own equipment

If your equipment can trigger from 24 V DC, the simplest arrangement
is to use the voltage across the sensor's power supply as a trigger.

•

Connect the ground pin A to your equipment's trigger return

line. If your equipment does not have a separate trigger return
line, consult its documentation for how to apply trigger voltages.

Güralp digitizers use the power ground line as a trigger return.
(The diagram above does not show the power supply to either

the sensor or the triggered equipment: only the triggering system
is shown).

Issue N