Cygwin Windows --> Accessing serial port.

Sébastien Lorquet squalyl at gmail.com
Sun Jun 12 18:53:49 UTC 2011


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
>
>
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