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Engine Hour meter with NMEA output?

Discussion in 'Boat Electronics' started by Glenn Ashmore, Apr 7, 2005.

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  1. Almost finished with my microcontroller fuel based management system and
    stil have the USART pins free. I am storing the gallons transferred in
    EEPROM but it would be nice to have a time base to store with them. If I
    had the engine hours for each transfer I could calculate average fuel
    consumption and a lot of other interesting tidbits. Anyone know of an hour
    meter that has digital output?

    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  2. The CruzPro RH30 and RH110 digital RPM/engine hours gauge outputs a
    proprietary NMEA sentence that contains:

    RH30/RH110 Digital RPM/Engine hours gauge sample sentence:

    $PBVE,BEAAADAAABFKBCIIBDAGOOABAAAAADAAAAOIACAAONFMAKCAADAAAAHG


    Parse as:
    $PBVE, B E AA ADAA AB FKBC IIBD AGOO AB AAAA AD AAAA OIAC AA
    ON FMAK CA AD AAAA HG

    B = Product Code (B= RH30)
    E = Software Version
    AA = Spare NMV Byte (Ignore)
    ADAA = Display Damping
    AB = Ignore
    FKBC = Maximum RPM seen from last reset
    IIBD = High RPM Alarm value
    AGOO = Clock Speed Calibration #
    AB = Backlight Level
    AAAA = Maintenance count-down alarm
    AD = Engine Minutes
    AAAA = Engine Hours
    OIAC = RPM Calibration number
    AA = Mode
    AN = Non voltatile memory checksum
    FMAK = RPM
    CA = Elapsed Seconds
    AD = Elapsed Minutes
    AAAA = Elapsed Hours
    HG = NMEA Sentence checksum

    Where A=0, B=1, C=2, ... , O=14, P=15

    Decode RPM as:
    FMAK = 16*F + M + 4096*A + 256*K
    FMAK = 16*5 + 12 + 4096*0 +256*10
    FMAK = 2652 RPM


    **************************************************************

    Best Regards,

    Bert van den Berg
    CruzPro Ltd.
    www.cruzpro.com
    35 Keeling Road, #A4
    Henderson 1008
    New Zealand
    Tel: 64-9-838-3331
    Fax: 64-9-838-3332
     
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