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15059Re: [tracker2] OTUSB UI-VIEW32 GPS Pass Through? Serial Data Monitoring?

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  • Lynn W. Deffenbaugh (Mr)
    Dec 28, 2012
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      For a KISS port passthrough, simply take the entire NMEA sentence
      (configurable as to which one if you like or just the pair that have
      lat/lon speed and altitude) including the checksum and <CR><LF> and put
      it inside a KISS wrapper <CO><00>$GPxxx,n,,n,n,n,n,n,n,n*cs<CR><LF><CO>
      and interleave it with all of the other APRS packets coming through in
      KISS mode.

      Optionally, you can put an alternate port number in bits 4,5,6 of the
      command byte per the MKISS protocol. The TinyTrak4 supports this. It
      may or may not make the interleave stream less confusing to some KISS

      Oh, and since you know the NMEA strings are printable ASCII, you don't
      need to worry about any of the KISS escape processing. There won't be
      any escape-necessary characters in a check-sum-passing NMEA sentence.

      For a TEXT port, just put the NMEA sentences in between the
      TNC2-formatted APRS packets, again with the checksum and <CR><LF>.

      Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

      On 12/28/2012 2:33 PM, Scott Miller wrote:
      > I know a couple of APRS clients will take NMEA in some sort of
      > encapsulation, but I haven't had time to run down the details. If
      > someone wants to provide me with the specs, I'll see what I can do.
      > It'll probably only make it into the T3, though - the OTUSB and T2 don't
      > have much code space to spare these days.
      > Scott
      > On 12/28/2012 11:30 AM, Fred Hillhouse wrote:
      >> Hi Chris,
      >> To only monitor data, set your COM port to 9600, 8, N, 1. I forget the
      >> mode but don't use KISS. Or you use the USB port and I don't remember
      >> what I did there. I think I had to set the RX level on the OTUSB as
      >> well to optimize RX. You will also need to set the VX-6 volume to the
      >> same level each time you use it.
      >> To actually use the TNC for TX and RX:
      >> The TNC will beacon on its own as a simple tracker. But if you want to
      >> see the world around you, you will need to connect a PC.
      >> I connect via serial (9600,8N,1) and use KISS on Port A.
      >> I connect a GPS to Port B. It does not interleave NMEA with regular
      >> data. I built a splitter to split port A and B to separate connectors.
      >> In addition, I added a GPS splitter so two devices can receive the GPS
      >> data. My GPS can feed my TNC and PC. Currently, the GPS data does not go
      >> to my TNC but the ability is always there when I need it.
      >> On the KISS port, I hang a PC (desktop, netbook, tablet, phone - yes,
      >> each of those have been connected at different times.
      >> On the PC, I run APRSISCE/32. Check it out! You may be pleasantly surprised.
      >> http://aprsisce.wikidot.com
      >> The OTUSB can run its own profile while connected to to a PC. The PC can
      >> also control it. This means that if you do not have a PC connected, it
      >> will beacon per your settings and when you do connect a PC, it will
      >> still beacon and the PC can TX/RX through it.
      >> I don't use an HT because the output level of the radio affects receive
      >> performance. I prefer radios with a Mini-DIN connector or one that is
      >> easily accessed internally. Once the levels are set, there is no way to
      >> just bump them. And they are pretty cheap.
      >> Best regards,
      >> Fred, N7FMH
      >> ------------------------------------------------------------------------
      >> *From:* tracker2@yahoogroups.com [mailto:tracker2@yahoogroups.com]
      >> *On Behalf Of *Chris Meyer
      >> *Sent:* Friday, December 28, 2012 13:56
      >> *To:* tracker2@yahoogroups.com
      >> *Subject:* [tracker2] OTUSB UI-VIEW32 GPS Pass Through? Serial Data
      >> Monitoring?
      >> I looked around briefly and couldn't find more information to answer
      >> these
      >> questions, but if there's a tutorial beyond what's in the back of
      >> the OTUSB
      >> manual please point me to it :-)
      >> Is there a way to pass GPS data from a GPS receiver plugged into the
      >> OTUSB
      >> to a computer running UI-VIEW32? I tried setting the GPS to the same COM
      >> port as the OTUSB in KISS mode but looking on the terminal and the
      >> terminal
      >> for the GPS receiver it's clear that no data.
      >> How do I monitor data coming from the OTUSB? I've attempted opening a
      >> basic serial terminal at 4800 but I don't see anything on boot/while
      >> it's
      >> running at all. I can hear APRS traffic on the radio but haven't
      >> successfully decoded any packets so it's challenging to figure out
      >> where to
      >> start debugging. I'm somewhat familiar with the APRS software as I was
      >> successfully using my sound card and radio to decode packets previously,
      >> just trying to figure out if I have software/hardware/or audio level
      >> issues
      >> with the radio. I'm using a VX-6R, currently don't have the 'HI' jumper
      >> set for audio levels on the OTUSB.
      >> To give you an idea of what I'm trying to accomplish, that might
      >> help point
      >> me in the correct direction - we're flying high altitude balloons
      >> and using
      >> APRS to beacon position data while the balloon is in the air and it
      >> works
      >> great (
      >> http://aprs.fi/#!mt=roadmap&z=11&call=a%2FKC9LAU-11&timerange=20000&tail=20000).
      >> However, when the balloon lands we lose signal as there aren't any local
      >> stations close enough to hear the 200mW beacon, so I want to take a
      >> laptop,
      >> the VX-6r radio, and the OTUSB and wander around in a field where we
      >> came
      >> down near until I can pick up the local signals and have it tell us its
      >> location. (Yes, we could use direction finding equipment to hunt it as
      >> well, but we're going to start with this as we have a lot more skill in
      >> this area). Ideally I would have a map of the local area cached (which
      >> there are plenty of instructions on), the GPS hooked to the OTUSB would
      >> plot our location on the map as I'm wandering around, and it would
      >> be able
      >> to decode data packets from our transmitter (as well as whatever else is
      >> around) and plot the reported coordinates on the map. Bonus feature
      >> would
      >> be transmitting our own location (the searchers) out to anyone else
      >> with a
      >> station that could get it online but I'm a lot more concerned with
      >> finding
      >> our weak signal first.
      >> Thoughts?
      >> Thank you,
      >> Chris
      > ------------------------------------
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