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Alexander Huemer alexander.huemer at xx.vuOn 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