NMEA 2000 data

[fairdeal]

we had a recent post regarding connecting the "Command Link" data stream
to a non-Yamaha "multifunction display" via NMEA 2000

thought I would provide an example of what data might display,
and how it would look on a particular MFD (in this case Garmin)

One interesting idiosyncrasy of the Yamaha N2K output is that,
with no trim input to the ECU, a 100% value for "trim" is broadcast
which prompts the non-Yamaha device to display this spurious "data"

this contrasts with the optional Command Link cooling water pressure -
where, with no input (no sensor connected) - no NMEA 2000 data is sent

Here are the "Engine" screens from a Garmin 547xs,
displaying available data from a F225TXRD:

tachometer
fuel flow rate
the spurious "trim" value
MAP (sent using the N2K ID for "engine boost pressure)
voltage (at the ECU)
oil pressure
engine temperature








also interesting on the Garmin side,
the 547 programming does not provide for display of "total engine operating hours" -
although Yamaha outputs it

[fairdeal]

here is, connected to the same F225TXRD, a Garmin 7608

the same data is displayed, with the addition of "engine hours"




You may note the "N" within the tach display on both MFDs

this is perhaps another inter-brand "glitch" similar to the trim value;

NMEA 2000 provides for communication of "transmission status" - forward, neutral, reverse

although the Yamaha is not passing that data,
the Garmin nonetheless displays "N" for neutral - which of course never changes

[pstephens46]

we had a recent post regarding connecting the "Command Link" data stream
to a non-Yamaha "multifunction display" via NMEA 2000

thought I would provide an example of what data might display,
and how it would look on a particular MFD (in this case Garmin)

One interesting idiosyncrasy of the Yamaha N2K output is that,
with no trim input to the ECU, a 100% value for "trim" is broadcast
which prompts the non-Yamaha device to display this spurious "data"

this contrasts with the optional Command Link cooling water pressure -
where, with no input (no sensor connected) - no NMEA 2000 data is sent

Here are the "Engine" screens from a Garmin 547xs,
displaying available data from a F225TXRD:

tachometer
fuel flow rate
the spurious "trim" value
MAP (sent using the N2K ID for "engine boost pressure)
voltage (at the ECU)
oil pressure
engine temperature








also interesting on the Garmin side,
the 547 programming does display "total engine operating hours" -
although Yamaha outputs it

Just curious...does the "n" in middle of screen change to "f" if in gear?

[fairdeal]

in addition to the above continuously updated engine parameter data,

the Yamaha ECU can also broadcast - and the MFD display - a NMEA 2000 "alarm":

high temperature
low oil pressure
water in fuel
"check engine"

[boscoe99]

You may note the "N" within the tach display on both MFDs

this is perhaps another inter-brand "glitch" similar to the trim value;

NMEA 2000 provides for communication of "transmission status" - forward, neutral, reverse

although the Yamaha is not passing that data,
the Garmin nonetheless displays "N" for neutral - which of course never changes

A Yamaha Command Link Control engine would provide transmission status which can be displayed on a Command Link Plus instrument but not on Command Link or non-Command Link instruments. A non-CL Control engine does not output this information. For now anyway.

N is an internationally recognized designator for RPM. Number of revolutions I suppose. In aviation with respect to a gas turbine it is:

N1. A symbol representing the rotational speed of the low pressure
compressor in a dual-spool gas turbine engine.

N2. A symbol representing the rotational speed of the high pressure
compressor in a dual-spool gas turbine engine.

It can also be used for the gas generator (turbine) speed as in "NG" or for propeller speed as in "NP".