Guralp Systems CMG-CD24 - Manual (Page 91)

Operator's Guide
recent data. Any external equipment must have its own buffering
capabilities if you need pre-trigger data.
•
Connect pin A to pin R, and pin T to your equipment's trigger
signal input.
•
Connect the remaining pins as normal.
If your equipment needs a different voltage, you will need to provide a
separate voltage source for the triggering system. Be careful not to
connect two power supplies together.
The diagram above illustrates how to trigger the external equipment
using its own power supply, which is connected to the trigger input
via the normally-open relay contacts (pins R and T).
In this configuration, the two power supplies are completely
electrically isolated courtesy of the relay. It is normal practice, though
not essential, to connect the two power supply negative terminals to a
common earth point.
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