Guralp Systems CMG-DCM build <10,000 - Manual (Page 190)

Acquisition Modules and Platinum Firmware Transmitting Data
The channels tab contains a drop-down menu and a table which allow the
operator to control which channels are transmitted and, optionally, rename
them.
Naming mode: The drop-down menu offers three choices:
• Automatic - all channels are compressed and named automatically:
Offers no filtering and uses the system-generated names for each
channel as forwarded by gdi­base.
• Semi-automatic - all channels are compressed, names may be mapped
below: One or more of the channels may be renamed by adding entries
to the mapping table. If you wish to use this mode, it may be useful first
to run the system in automatic mode for a short while: this will populate
the mapping table with an entry for each currently known channel,
which can serve as the basis for your own mapping table.
• Manual - only channels named below are compressed: Offers both
channel filtering and name mapping. If you wish to use this mode, it
may be useful first to run the system in automatic mode for a short while
to populate the mapping table with an entry for each currently known
channel; this can serve as the basis for your own mapping table.
Clicking the button on any row will open a new row. In the same way,
rows can be deleted by clicking the corresponding button.
Channels which do not appear in the mapping table will be transmitted
unmapped in “Semi-automatic” mode and not transmitted in “Manual” mode.
12.3.1.4 Heartbeats tab
EarthWorm has a “heart-beats” facility which can be used for monitoring
connections. Heartbeats are generated both by the client and by the server. A
heartbeat is a small packet sent at regular intervals so that an alert can be
raised if a heartbeat packet does not arrive within a configurable time.
Heartbeat packets contain configurable messages.
The following fields can be configured:
Export heartbeat timeout: This parameter controls how often this sender
instance will broadcast heartbeat packets to the EarthWorm installation.
Export heartbeat message: This field allows the user to set the message
contained within outgoing heartbeat packets.
Import heartbeat timeout: This parameter controls how often this sender
instance should expect to receive heartbeat packets from the EarthWorm
installation.
Import heartbeat message: This field allows the user to set the message that
this sender instance should expect to see within incoming heartbeat packets.
MAN-EAM-0003 190 Issue E - February 2014