Guralp Systems CMG-DCM build <10,000 - Manual (Page 96)

CMG-EAM (Platinum Firmware)
Here, you can configure the NMEA sentences that will be sent to the
digitiser. You can specify the location (latitude, longitude, elevation),
the geoid (the offset of the location from the theoretical earth surface)
and whether to invert the Pulse-Per-Second signal (if unchecked, the
PPS line will be briefly asserted each second, on the second, and held
to ground at other times). It is not essential that the position string sent
matches the physical location of the digitiser, as only the GPS time
signal is used by the digitiser. Click “Submit” to save the changes.
The following additional parameters are available in expert mode:
It may sometimes be desirable, for debugging purposes, to separate log
messages for this input from the standard system log. The Log file text
field can be populated with a path name which will then be used for
dedicated logging. If left blank, logging occurs (via the standard Linux
syslog facility) to /var/log/messages.
The Log level drop-down menu controls the level of detail present in
log messages, whether to syslog or to a dedicated log file. Not all of the
standard syslog logging levels are available. The menu offers a choice
(in order of decreasing detail) of:
•
Debugging information;
•
Informational messages;
•
Important notices; or
•
Warnings
The Max NTP error text field controls the accuracy of synchronisation
which must be achieved by NTP before the resulting NMEA sentences
will will indicate that the “GPS” is locked.
96 Issue C