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Old 24-03-2017, 11:41   #1
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NMEA 0183 message Help

Hi,

I would like to have a suggestion, ACTIVE CPN 4.6, while using the DASHBOARD and correctly set up teh panel and the message filter I can only see some gauges moving (GPS, Wind, COG, SOG)

Some other (below) show correctly in DEBUG window (all in green) while do not affect at all the gauges and values.

$GPRSA,-44,A,*17
(this message do not move the rudder gauge and panel only show "---")

$YXXDR,C,19,C*6B
(this message do not shows the Air Temperature in the panel, just "---")

$YXXDR,A,-2,D,PITCH,A,+0,D,ROLL,*3C
(this message only shows the ROLL in related panel but not the PITCH)

$YXXDR,V,11.9,V,VOLTS,*26
(this one I guess is not supported...)


Any help is welcome !
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Old 25-03-2017, 01:57   #2
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Re: NMEA 0183 message Help

The RSA is a standard message and should have this syntax:
Code:
 /*
   ** RSA - Rudder Sensor Angle
   **
   **        1   2 3   4 5
   **        |   | |   | |
   ** $--RSA,x.x,A,x.x,A*hh<CR><LF>
   **
   ** Field Number: 
   **  1) Starboard (or single) rudder sensor, "-" means Turn To Port
   **  2) Status, A means data is valid
   **  3) Port rudder sensor
   **  4) Status, A means data is valid
   **  5) Checksum
   */
As you can see your message,$GPRSA,-44,A,*17, seems to miss one comma. It should have read: $GPRSA,-44,A,,*3B.
(Dashboard don't care for the (missing) port angle data. Your single Starboard would've been enough.)


The XDR message has this syntax:
Code:
 /*
   ** XDR - Transducer Measurement
   **
   **        1 2   3 4            n
   **        | |   | |            |
   ** $--XDR,a,x.x,a,c--c, ..... *hh<CR><LF>
   **
   ** Field Number: 
   **  1) Transducer Type
   **  2) Measurement Data 
   **  3) Unit of Measurement, Celcius
   **  4) Name of transducer
   **  ...
   **  n) Checksum
   ** There may be any number of quadruplets like this, each describing a sensor. The last field will be a checksum as usual.
   */
The XDR message is more "free" and can be used in different ways.

Your $YXXDR,C,19,C*6B should though have been understood by Dashboard if one more comma was added, like:
$YXXDR,C,19,C,*47 (The Name is not read for Type "C" by Dashboard)

Your:
$YXXDR,A,-2,D,PITCH,A,+0,D,ROLL,*3C Is correct but unfortunately is Dashboard using transducer name "PTCH" and not "PITCH" to detect a type "A" as a pitch message. (The name "ROLL" is, as you say, understood.)

Correct, $YXXDR,V,11.9,V,VOLTS,*26 is so far not used by the Dashboard.

Håkan
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Old 25-03-2017, 02:12   #3
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Re: NMEA 0183 message Help

Thanks Hakan !!!

Really great help... now I have what to take care.

Going to try modifying those strings, and will post the result.

Marco
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Old 27-03-2017, 10:33   #4
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Re: NMEA 0183 message Help

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Many thanks Hakan !

Messages are now correct and it works greatly.

Marco
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Old 27-03-2017, 11:13   #5
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Re: NMEA 0183 message Help

I suspect that showing green in the debug window only means
that it is a known message type with a good checksum, and not
endorsing the decode-ability of the message contents.
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Old 27-03-2017, 11:27   #6
bcn
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Re: NMEA 0183 message Help

Especially when talking about an $XDR message which is by definition free for vendors to define contents and magnitudes.
XDR = "some transducer"
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Old 27-03-2017, 11:50   #7
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Re: NMEA 0183 message Help

marco..
Thanks for the response, I'm glad you've fix it.

Maker42..
re:"I suspect that showing green in the debug window only means
that it is a known message type with a good checksum
"- Yes, correct and not sorted out by any connection filter. (Filtered = red)

Håkan
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Old 28-03-2017, 01:37   #8
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Re: NMEA 0183 message Help

Right BCN, the XDR is a "semi custom" message... while for those information is the single one to be used and OPENCPN may accept some of them, any way Hakan detected my "format" mistakes, it was very easy to correct because the used gateway is my design.

Meanwhile any Idea why CM93 maps (quite old) do no show any text ? (port names and so on...) I verified and text option seems to be checked.

Marco
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