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
Larry K7YBZ --- In [email protected], "Erich J. Ritzmann" <ejr...@...> 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 >
