4-29
Utilizing the Applanix POSVIEW software set the ethernet real-time broadcast to groups 3,7,10, and 102.
The output rate of the POS-MV should be set to 50Hz. The POS-MV must also be set to Falling (Negative)
Edge or Active Low for the 1PPS as the 6205s defaults to sync on the falling edge. The POS-MV must also
be set to UTC (default), not GPS, for the main time frame.
See POS MV V5 User Interface Control Document (PUBS-ICD-004089) latest revision for full details of data
telegrams. In summary, the POS-MV groups are:
• Group 3 = Primary GNSS status, used for time field for time sync
• Group 7 = PPS time recovery and status. Not used by EdgeTech
• Group 10 = General Status and FDIR
• Group 102 = Sensor 1 time, position, velocity, attitude, heave & dynamics, used for position and
attitude.
For more information, refer to the D
ISCOVER BATHYMETRIC SOFTWARE USER MANUAL (0014878).
4.2.3.3 PPS Port Configuration
Pulse per second (PPS) is a feature in many GPS units to provide an accurate timing signal to synchronize
various devices to a precise, common clock. The Edgetech 6205s-R rack-mounted and 6205s-P portable
topsides provide a rear panel 1PPS port to physically connect to a PPS capable unit. The 6205s-R is
depicted in F
IGURE 4-2. The logical configuration is done in the attached GPS’s configuration and activating
the 1PPS option in E
DGETECH’S DISCOVER BATHYMETRIC SOFTWARE.
CAUTION! The 6205S system is optimized to work with a falling edge
1PPS signal.
The EdgeTech Isolator Board is designed to identify the input signal's falling edge and reconstitute it as a
rising edge 2.27ms pulse. This signal is passed down the deck cable to the subsea electronics, where the
rising edge is utilized as the 1PPS time sync reference. Refer to F
IGURE 4-3. This configuration produces
little to no latency when a falling edge 1PPS signal is injected at the topside.
NOTE: To learn more about the EdgeTech Isolator Board, refer to the
TOPSIDE PROVIDED ISOLATION section of this manual.
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