Guralp Systems CMG-3T - Manual (Page 5)

Operator's guide
As an option, the 3T can be supplied with a 26-way “D”-type
connector with standard pin assignments (see section 6.2, page 48.)
Other output connector types may also be supplied, to your own pin-
out specification.
Sensor control interface
3T instruments can be fitted with an optional RS232 control interface.
The control interface can be used to lock, unlock, and centre the
sensor masses, and query mass positions. See section 5.3, page 41, for
more details.
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