Guralp Systems CMG-CD24 - Manual (Page 109)

Operator's Guide
You will then be prompted to enter COM port and modem details:
The “Country/region”, “Area code” and “Phone number” boxes can be
ignored: they are only used when working with modem connections.
Select the name of the correct COM port from the “Connect using”
drop-down menu, then click OK. You will then be prompted to select
port configuration settings:
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