Throttling SCX-20 NMEA2000 Output

[RickVicik]

The SCX-20 sends a number of PGNs that may not be needed on my boat. I'd like to disable them to reduce NMEA2000 bus utilization but need to understand what functionality will be lost.

PGNs 127252 and 130842/843/845/846 aren't listed as input in the TZT14 or TZT19F manuals (or in the manuals for the other NMEA2000 devices on my boat). They seem like good candidates with no loss.

PGN 130577 is listed as input to the TZT14 & TZT19F but contains the same info as PGN 127250(HDG) plus 129026(COG & SOG) which are also input to the TZT14 & TZT19F. 127250 & 129026 are more frequent, so 130577 seems like another candidate with no loss.

PGN 130578 appears to be used only by the 3-Axis Speed Display in the TZT19F. That seems like another candidate if I can get by without the 3-axis speed display.

Does this sound reasonable? Am I missing something?

PGN Description
127252 Heave
130577 Direction Data (COG/SOG/HDG/STW/Set/Drift)
130578 Vessel Speed Components (longitudinal & transverse, water & ground ref.)
130842 6 Degrees of Freedom Movement
130843 Heel Angle and Roll
130845 Multi Sats in View extended
130846 Motion Sensor Status extended

 

[Johnny Electron]

What sounder are you using? The reason I ask is "Heaving" is useful to most sounders to stabilize the sounder bottom. Whatever you turn off can always be turned back on so it isn't an irreversible decision.

 

[RickVicik]

The sounder is a BBDS1 connected to the TZT14 by ethernet.

 

[Johnny Electron]

The BBDS1 will support heaving automatically so I would recommend leaving that data turned on.

 

[RickVicik]

OK, thanks for the info.
---rick