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confusing loopback loop

 
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peterh
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Joined: May 17, 2012
Posts: 26

PostPosted: Sat Jun 23, 2012 3:22 pm    Post subject: confusing loopback loop Reply with quote

Today i connected the multiplexer in the oat.
Unfortently i had no config sogtware ( the cd i received had omly a linux-64 binary)
but i tried anyway, hoping for defaults to save me. They did, in a way:

A word about my current equip, it'a a raymarine a70 GPS ( with 2 serial ports),
one raymarine S1 autopilot (AP) ( with one nmea port),
one icom AIS receiver
one to be connected echopilot and future wind instrument.

The AIS is connected to nmea-1 on the gps, the AP to nmea-2
( the S1supplies with compass heading, and is suppled with waypoint
info when i have the S1 to steer toward a waypoint ( follow track)). Thus i
need a bi-directional comminucation between GPS and AP

Now adding the nmea-mux i connected as :
mux-nmea-1 out connects to AP input, and GPS nmea-input-2
mux-nmea 4-in is feed from AP out
mux-nmea 3-in is feed from GPS nmea-2-out

( mux-nme2-in is planned as echopilot out but still not used)

Turning on power showed initially success, i when switching on AP i got
a heading displayed in GPS.
To test GPS sending i commanded "go to cursor", this was visible
in the AP display ( i could se the distance and bearing to a waypoint)

Now to my problems:
trying to "stop goto cursor" in the GPS menues worked for a split second, then
it reappeared !. There was no way i could turn off "goto" unless i disconnected
the mux-nmea-1-out. It seemed that the "goto" command from GPS was
echoed back to the GPS through the MUX.

I also noticed that the AP heading remained even after a shut off the AP,
normally the GPS warns me after a few seconds that "heading values lost". Now
it seemed as the circulated around the system indefinitly.

What is wrong with this ? Do i have to create filters to prevent this looping ?
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peterh
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Joined: May 17, 2012
Posts: 26

PostPosted: Sun Jun 24, 2012 5:28 pm    Post subject: Reply with quote

I'll respond to my self Smile

The looping solved by a combination of techniques ;

one: output from mux to gps is via nmea2 that has some filters, everything else
is feed from nmea 1

The heading repeat ( where the GPS would resend heading info that
would feed back to the gps itself was cured by a filter VHW that sends only to nmea1

the "goto" problem might be solved by filtering BWR APB RMB BWC (only to nmea 1)
It cures at least the "goto" loop but i ave not tested if the AP works with "track" or goto
I'll have to come back with report if this config is enough.

summary , filters VHW BWR APB RMB BWC goes only to nmea 1 ( nmea 2 is input tp GPS)
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FWallenwein
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Joined: Mar 26, 2006
Posts: 417
Location: Mannheim / Germany

PostPosted: Sun Jun 24, 2012 6:31 pm    Post subject: Reply with quote

peterh wrote:

I'll have to come back with report if this config is enough.


Thank you for that. I'll appreciate any feedback.
User feedback is valuable source of knowledge for me and all the other users.
I can only try and test with the equipment I have available.
And there is so much more types and combinations of NMEA/SeaTalk devices out there, so that every bit experience is very welcome Smile


Best regards
Frank
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FWallenwein
Site Admin
Site Admin


Joined: Mar 26, 2006
Posts: 417
Location: Mannheim / Germany

PostPosted: Tue Jul 17, 2012 5:48 pm    Post subject: Reply with quote

I'll respond to my self as well Smile

The loopback problem has been solved - as peterh allready wrote.
As a result of this, I released a new version of the config tool and firmware.
It has - amongst other new features - a function, that indicates from which port a NMEA sentence was received.
This helps to set the filters properly.

Thank’s again for the feedback - it helps to make the project better.

Frank
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