Guralp Systems CMG-DCM build <10,000 - Manual (Page 92)

CMG-EAM (Platinum Firmware)
connection is made between Port C of the EAM and the digitiser
module. This connection can operate in one of two modes:
•
An external GPS receiver can provide input to both the
digitiser module's clock circuitry and the EAM's NTP
subsystem; or
•
The EAM's NTP subsystem can provide NMEA to the digitiser
module's clock circuitry. In this case, the external GPS socket
is automatically disconnected.
The data flow when a GPS receiver is used is illustrated below:
If required, the NTP subsystem can provide NMEA output via a serial
port which can then be used to synchronise an additional digitiser.
This, however, is optional and no serial port is dedicated to this use.
To configure the NTP subsystem, see section 6.3 on page 64.
To configure NMEA as an NTP clock source, see section 8.5 on page
93.
To configure NMEA output, see section 8.6 on page 94.
92 Issue C