This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/baseband-devel@lists.osmocom.org/.
R M rm.engineer84 at gmail.comHi, If I have a prolific usb to serial converter can I be sure that the voltage levels that I get is 3.3V and not 5V. My serial cable seems to be fine. I have done a loopback test and its echoing whatever I have typed using hyperterminal. My mobile phone's audio jack is also fine. I am able to use the hands free feature and listen to the voice. I hence feel that the 2.5mm male connector of the serial cable is not properly connecting to the audio jack of the phone though it sits properly. Is there a way I can rectify this without buying a new serial cable? Regards, RM On Mon, Jun 13, 2011 at 12:45 AM, Arne <zachso at arcor.de> wrote: > > the 3v3 version of max232 is max3232, but this isnt what he needs. > > RM, you need a usb->RS232 only if you have no RS232 at one of you > computers/notebooks available. if you have a normal RS232-port you have > already everything you need and can use you cable > > bye > arne > > > On Sun, 12 Jun 2011 20:53:49 +0200 > Sébastien Lorquet <squalyl at gmail.com> wrote: > > > If you want to use a basic serial port, use a 3.3V version of the > > good ol' MAX232 (maybe MAX202? can't remember) > > > > Sebastien > > > > On Sun, Jun 12, 2011 at 8:20 PM, Alexander Huemer > > <alexander.huemer at xx.vu>wrote: > > > > > On Sun, Jun 12, 2011 at 11:11:37PM +0530, R M wrote: > > > > Why do I need a USB/RS232 cable ? > > > > > > > > If its a laptop, I can understand that they don't come with a > > > > serial port > > > so > > > > you need the converter. > > > > > > > > Many PCs come with a serial port. > > > > > > > > Can I not connect the serial version of the T191 unlock cable to > > > > PC > > > serial > > > > port? > > > You could, but the RS232 ports that are often present on ATX-style > > > mainboards provide 12V, which is too much for the phone. > > > > > > > > As far as I understand, the T191 unlock cable is used to convert > > > > RS232 signal level to 3.3V required by C128. > > > no. A serial T191 cable does nothing by itself. > > > > > > > > Since I was able to get hold of a serial version of T191 unlock > > > > cable as > > > I > > > > told you in the begining of the mail, I also purchased a USB to > > > > Serial converter. Its a BAFO BF-810. > > > > Its based on Prolific chipset. > > > Unfortunately the prolific chips seem to not work as well for this > > > purpose as the FTDI chips. > > > > > > > > So I connected first the USB/RS232 converter ju(BAFO BF-810) and > > > > then > > > the > > > > serial version of the T191 unlock cable. > > > > > > > > Is this the right way ? > > > > OR > > > > Can I just connect the USB/R232 converter (based on Prolific > > > > chipset) and the use a cable which contains DB9 female on one > > > > side and 2.5mm jack on > > > the > > > > other? > > > I don't get the difference between those two ways. > > > > > > > > I am asking the second question because you have mentioned in the > > > > wiki > > > under > > > > Hints and Warnings like this: > > > > > > > > If you don't use a 3.3V (low voltage TTL, LVCMOS) serial port you > > > > can fry your phone! (internally, it connects to the IO-pins of > > > > the baseband processor which run at 2.8V). *Don't connect > > > > directly to your PCs serial port (running at +/- 12V!).* > > > This warning wants to tell you that you should use a USB<-->RS232 > > > converter and not use an onboard port of a PC. > > > > > > Kind regards > > > -Alex > > > > > > > >