It's RS-232, but only the RX side (from the nuvi) goes through the ST202 chip, and that's only because it needs to be inverted. The TX side (to the nuvi) comes straight out of the MCU, and is inverted on-chip. The nuvi wants to see 3.3v, so using the ST202's transmitter would have fried it.
The other side is proper RS-232, though. Scott Dwaine Garden VE3GIF wrote: > > > The Garmin side of the board, what format does it transfer the data? I > though it would be serial. > > Maybe a new cable with a PICAXE that could do the converstaion from > WMR968 to Peet brothers weather data format. > > ------------------------------------------------------------------------ > *From:* Scott Miller <[email protected]> > *To:* [email protected] > *Sent:* Wednesday, August 12, 2009 12:26:28 AM > *Subject:* Re: [tracker2] GTRANS code and firmware update > > > > I haven't made the source code for the GTRANS available, but if you're > just reprogramming the board for some other purpose, you could start > with the OpenTracker+ RT code - it'll load on the AW32 MCU. I think the > GTRANS should be loadable using otwincfg. The ADSUpdater utility is > basically otwincfg with everything but the firmware load portion removed. > > It still might not be quite what you need, though. The Garmin side of > the board puts out 0-3.3v and doesn't use the RS232 transceiver. > > Scott > > DwaineGarden@ rogers.com <mailto:DwaineGarden%40rogers.com> wrote: > > > > > > I was wondering the location of the newest version and the source of the > > firmware. There were messages on this forum about using a serial cable > > to reflash the GTRANS processor. > > > > I was thinking of maybe reprograming the processor to convert an Oregon > > WMR-968 weather station data stream to one of the weather stations that > > the Kenwood D710 decodes. That way I could get rid of having a dedicated > > computer so I can send my weather information to the Kenwood D710 > > directly. From the WMR-968 display console, then serial to the GTRANS > > processor for conversion to the 3.5mm connector feeding into the D710. > > > > It would be a fun project. > > > > Dwaine > > VE3GIF > > > > Sent from my BlackBerry device on the Rogers Wireless Network > > > > > >
