The wiring for the T2-301 is the same as the OT2m if you use the yellow serial+power cable. You wouldn't be able to run the Garmin cable alone since it doesn't provide power.
Scott k7ybz wrote: > > > Erich, > > I forgot to add that you can have Scott add a DB-9 connector to that > Garmin cable in the checkout. Just make sure you mention it is for a > T2-301 as the pinout is different than an OT2. > > Larry > K7YBZ > > > > > Erich, > > > > To connect between the Nuvi 350 and the OT2 you need a USB to RS232 > converter. You can make one by using diodes and resistors (look in the > files section of the tracker2 group) or you can buy the Garmin version > from Scott. The Garmin part number is 010-10813-00. Here is a link to > Scott's page: > > > https://www.argentdata.com/catalog/product_info.php?cPath=28&products_id=90 > <https://www.argentdata.com/catalog/product_info.php?cPath=28&products_id=90> > > > > Larry > > K7YBZ > > > > > > --- In [email protected] <mailto:tracker2%40yahoogroups.com>, > "Erich J. Ritzmann" <ejritz@> wrote: > > > > > > > > > You are correct -- with the "powered cable", I was indeed referring to > > > the yellow cable. And, looks like I overlooked the bit about voltage > > > differences. > > > > > > A pair of (series?) diodes & (series?) resistor, designed to drop the > > > voltage from the output of the T2-301 from 5 to 3.3vdc. > > > > > > But going the other direction, would 3.3v be enough to be readable by > > > the T2? > > > > > > The only cable that came with the Nuvi looks like a normal USB with a > > > normal connector on one end and a USB-b "mini" on the other -- is that > > > the one you are referring to? I can certainly cannibalize that. > > > > > > -- > > > ER > > > > > > On 20-Aug-09, at 12:44 AM, Scott Miller wrote: > > > > > > > Ok, back up for a minute. What cables are you using? Are you > > > > connecting directly to the T2-301, or are you using the yellow and > > > > black > > > > cable? > > > > > > > > The nuvi needs 3.3v levels. If you're connecting it to a T2 of any > > > > type, you need to either use the Garmin cable with the level shifter > > > > built in, or use a couple of diodes and a resistor to limit the > output > > > > level. > > > > > > > > Scott > > > > > > > > va3xto wrote: > > > >> > > > >> > > > >> I wired up a T2-301 with a powered cable using two USB-b connectors. > > > >> > > > >> Serial pins 4&5 supply power to pins 1 &5 of USB-b-B (5 vdc power > > > >> on back) > > > >> > > > >> Serial pin 2 connects to pin 3 on USB-b-A (FMI on side). > > > >> Serial pin 3 connects to pin 2 on USB-b-A (FMI). > > > >> > > > >> 8.06k measured resistance between ground and USB-b-A pin 4 brown. > > > >> > > > >> The Nuvi gets power from the back, no problem. Disconnecting back > > > >> yields > > > >> serial device must have power, yada, yada. > > > >> > > > >> The GPS is working based on the map it displays on the Nuvi itself. > > > >> > > > >> The T2-301 doesn't seem to send any data using the Nuvi. (And, > > > >> transmitting packets nearby from another machine does not > display the > > > >> expected waypoint.) > > > >> > > > >> Before plugging in the Nuvi, I had the T2-301 transmitting APRS > > > >> packets > > > >> using the ADS-GM1 GPS. > > > >> > > > >> Any ideas what I am missing? > > > >> > > > >> > > > > > > > > > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > -- > > > Erich J. Ritzmann > > > > > > >
