Cygwin Windows --> Accessing serial port.
rm.engineer84 at gmail.com
Sun Jun 12 17:41:37 UTC 2011
I am a bit confused about the kind of cable I need to use.
I have read the wiki about the calypso serial cable at
The Calypso phones typically all have a serial port @ 3.3V levels on the
2.5mm earphone jack.
Those cables are sometimes called *T191 unlock cable*.
You can either buy ready-made cables, e.g. at:
- USB variant
- RS232 variant, you still need a separate standard USB/RS232 cable
- handy-style.de <http://www.handy-style.de/index/cat190/2130>
- USB/RS232 cable
- tronisoft.com <http://www.tronisoft.com/cat_usbtoserial.php> (FTDI
and Prolific cables)
If you click on cellcorner.com, you get a serial version of T191 unlock
I have purchased a similar cable not from that link but from a local shop
near my home. (I am from India).
The reason I have purchased the serial version is that the local shop only
has the serial version.
You have said in the wiki for the serial version, I still need a separate
standard USB/RS232 cable.
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
As far as I understand, the T191 unlock cable is used to convert RS232
signal level to 3.3V required by C128.
I have a laptop and not a PC. It doesn't have a serial port.
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.
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 ?
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
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!).*
On Tue, Jun 7, 2011 at 12:13 AM, Otten, John E. <john.otten at gd-ais.com>wrote:
> Don’t hold the power on button. You should just press and release the
> power button to start the bootloader.
> I was able to access the serial port.
> I ran the following command
> ./osmocon -p /dev/ttyS5 -m c123xor
> ../../target/firmware/board/compal_e88/hello_world.compalram.bin in cygwin
> I then held the power on button of the phone for some time. I got some
> output on the cygwin console.It isn't the expected output as per the wiki.
> After disconnecting, I tried to run the same command and nothing is
> Can some one please suggest me what steps I need to take to solve the
> I am using Motorola C115 phone.
> On Sat, Jun 4, 2011 at 12:12 PM, Dieter Spaar <spaar at mirider.augusta.de>
> Hello Harald,
> On Sat, 4 Jun 2011 08:46:50 +0200, "Harald Welte" <laforge at gnumonks.org>
> > i have never heard of somebody doing this on windows 7. Almost everyone
> > here uses Linux or MacOS. And the only prominent Windows user involved
> > in the project is working with Windows XP.
> At least on my Cygwin installation under Windows XP the serial port
> is accessible as "/dev/ttySx" (x is "0" for COM1, "1" for COM2 and
> so on). All the USB to serial converters I am aware of are virtual
> COM ports on Windows which means that they are accessible the same
> way, e.g. if the virtual COM port is "COM7" it can be be accessed
> as "/dev/ttyS6",
> Best regards,
> Dieter Spaar, Germany spaar at mirider.augusta.de
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