Kongsberg EM 712, Maintenance Manual

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Supported datagram formats for external clock
The EM 712 supports the following datagram format from an external clock.
This datagram format is received using a serial communication line.
•
NMEA ZDA
The NMEA ZDA datagram contains the universal time code (UTC), day, month,
year and local time zone.
Supported datagram formats for heading information
The EM 712 supports the following datagram formats for vessel heading and/or gyro
information.
These datagram formats are received using a serial communication line.
•
NMEA HDT
The NMEA HDT datagram provides the true vessel heading. The information is
normally provided by a course gyro.
•
SKR82 Heading
This is a third-party proprietary datagram format for heading. It was created by
Simrad Yachting (
https://www.simrad-yachting.com ) for use with their Simrad
Robertson SKR80(82) gyrocompass.
Supported datagram formats for depth information
The EM 712 supports the following datagram formats for depth information from an
echo sounder.
These datagram formats are received using a serial communication line.
•
NMEA DBS
The NMEA DBS datagram provides the current depth from the surface. The datagram
is no longer recommended for use in new designs. It is frequently replaced by the
NMEA DPT datagram.
•
NMEA DPT
The NMEA DPT datagram provides the water depth relative to the transducer, and
the offset of the measuring transducer.
•
Simrad EK500 Depth
Simrad EK500 Depth is a proprietary datagram format created by Kongsberg
Maritime. It was originally defined for the Simrad EK500 scientific echo sounder.
It provides the current depth from three channels, as well as the bottom surface
backscattering strength and the athwartships bottom slope. This telegram has been
designed for output on either a serial line or a local area network Ethernet connection.
Kongsberg EM 712 Maintenance Manual