wired serial GPS problem/question

Discussion of the 700p.

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leonidm
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Posts:2
Joined:Fri Apr 20, 2007 9:09 am
wired serial GPS problem/question

Post by leonidm » Fri Apr 20, 2007 9:53 am

I have the folowing combination:
1) treo 700p
2) seidio car kit G2500
3) Solar Bluetooth GPS Receiver based on MediaTek MT3 BT 2.3MR chipset
I beleive GPS can also act as a serial gps -it has a mini-USB connector that has GND, Vcc, Serial Rx andTx at 3.3v

I made a cable and hooked up GPS to the car kit - the charging function works, but the GPS part doesn't. I tried 9600,8,N,1 and pretty much every other speed and combination. If i start ptelnet and configure it to look at serial port , it does see traffic from gps, but it looks like garbage at any speed I tried. It doesn't look like a readable strings serial gps would send. I hooked up gps to a scope and saw a nice square wave with signal level of 3.3v (is it a problem ? does treo expect 5v signals? but then I don't think i would see anything at all) BTW, it works fine in BlueTooth mode.
Have anybody did something similar?

leonidm
Newbie
Posts:2
Joined:Fri Apr 20, 2007 9:09 am

Post by leonidm » Fri Apr 27, 2007 1:06 pm

OK, I found the problem - the seidio car kit have a small inverter board inside ,that's why i saw garbage - once I've bypassed it , it started to work fine.

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