Guralp Systems CMG-DCM build <10,000 - Manual (Page 112)

Acquisition Modules and Platinum Firmware Digitiser Configuration
8.1.1.11 Transmission Parameters
Heartbeat interval: When the digitiser is in the “filing” or “dual”
transmission modes regular heart-beat messages are sent. This allows
software such as Scream to be aware of the devices even though they are not
sending sampled waveform data. The frequency of these messages can be set
to an integer number of seconds.
Acknowledgement delay: When the digitiser is in the “adaptive” or “FIFO”
transmission modes, special action is taken if data cannot be transmitted. The
acknowledgement delay field controls how long the digitiser waits for an
acknowledgement packet before assuming that the link has failed. This
should be set to an integer number of milliseconds.
8.1.1.12 Ports
The Ports section of the web page allows control of the baud rates of the
digitiser's serial ports:
For a stand-alone digitiser or digital instrument, the “GPS” and “Data in” ports
are exposed on external connectors. The “Data out” port is assumed to be
connected to the acquisition module and the rate set here must match that set
for the appropriate serial port (see section 10.1 on page 128 for details of
reconfiguring serial ports).
MAN-EAM-0003 112 Issue E - February 2014