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Sébastien Lorquet squalyl at gmail.comIf 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 > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20110612/8a748827/attachment.htm>