Opencpn and Rudder angle

[Ontrackx]

Hi, I have a
IIRSA,23.5,a

And some others do I have to convert this from IIRSA to RSA somhow?

See image

Please help

[conachair]

All of those sentences look like they are missing the checksum at the end?

NMEA Revealed

[Ontrackx]

This is a old CETREK autopilot

I have just connected to the GND and TX (how does a checksum work in NMEA scententeses?)

[Ontrackx]

I will try the Nmea converter plugin

(i have no reaction from the dashboard with $IIRSA, will try to remove the two II's with nmea converter)

[conachair]

Originally Posted by Ontrackx

I will try the Nmea converter plugin

(i have no reaction from the dashboard with $IIRSA, will try to remove the two II's with nmea converter)

The leading II's shouldn't make any difference? They identify the talker ID -

NMEA sentences do, however, include a "talker ID" a two-character prefix that identifies the type of the transmitting unit. By far the most common talker ID is "GP", identifying a generic GPS, but all of the following are well known

NMEA Revealed

You could maybe try unselecting "control checksum" in the opencpn connections window?

[Ontrackx]

Thanks, i wil try everyting tomorrow

[conachair]

Originally Posted by Ontrackx

Thanks, i wil try everyting tomorrow

Just gave it a go without the control checksum - didn't work.

I did get the dashboard rudder angle working though, bad news is your nmea massage needs to look something like this-

$IIRSA,44,A,,*1

The *1 at the end is the checksum, the device sending adds this by adding up all the text in the message in a slightly odd way, the device receiving does the same and if the result is the same as the checksum sent then the message is probably OK.

The NMEA converter might be able to make a message like that for you from the messages coming in?

[Ontrackx]

Yayy it works (installed nmeaconverter on my windows machine)

Now, how to change the scaleof the rudder indicator from max 40 to max 30

[seandepagnier]

I don't think you can change the scale.