Guralp Systems CMG-CD24 - Manual (Page 89)

Operator's Guide
The Trigger Out relay is not activated if you provide a Trigger In
voltage. The digitiser must trigger itself for the relay to switch. This
arrangement prevents any trigger loops from occurring.
The diagrams on this and the following pages show the additional
connections you will need to make. Pins not illustrated should be
connected to your power and data systems as normal.
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