Sorry for the confusion again, that is not the right pyUSB or version. The
Win Add/Remove program displays the other pyUSB and not the one I am
currently using. However, I am sure I am using pyUSB authored by you. What
is the best way to check which version I am currently using? I seem to have
downloaded and installed both at different points of time.
Regards
On Mon, Jan 17, 2011 at 11:22 PM, Sridev Nair <sksridevn...@gmail.com>wrote:
> I am using Python 2.6 pyUSB-1.6
>
>
> On Mon, Jan 17, 2011 at 10:37 PM, wander.lairson <wander.lair...@gmail.com
> > wrote:
>
>> 2011/1/17 Sridev Nair <sksridevn...@gmail.com>:
>> >>>Are you sure it is a control request, not a simple bulk transfer?
>> > I tried it as bulk/interrupt transfer however there was no response from
>> the
>> > device. The vendor doc doesn't mention anything about the type of
>> request.
>> > This command happens to be the first command run by the demo
>> application.
>> >>>You need to know if you want to send hexadecimal data as
>> ASCII characters
>> >>> or bytes:
>> > I checked from the USB monitor that the demo application sends it as
>> > "020200013803"
>> > I would like to summarize the whole situation again as there are some
>> more
>> > observations/developments and I might be able to rephrase it better now
>> that
>> > I have some light on USB spec & usb-serial port communication,
>> > When I run the initial code (detailed in the first post) I am able to
>> make
>> > the device (a controller) execute the command since I see the response
>> to
>> > the command in the window of demo application provided by the vendor
>> and,
>> > further, the LED on the device glows indicating that it received the
>> > command. However, I am not able to capture the same response on my
>> program
>> > through dev.read() command.
>> > Secondly, perhaps more significantly, when I close the port through the
>> demo
>> > application (or close the demo app itself) neither the dev.write() nor
>> > dev.read() works.
>> > Now, earlier we believed that there might be some specific vendor
>> command
>> > which might be opening & setting the config such as baudrate, etc.
>> However,
>> > I have reliably learnt from vendor docs & vendor tech support that there
>> > isn't any such specific config commands and that any read/write on port
>> > should either respond with proper info/data or error code from the
>> device.
>> > I understand that managed_open() opens the port implicitly and passes
>> the
>> >
>> I got a bit confused now, are you using PyUSB 0.4 or 1.0? (or 0.4 API
>> emulation over 1.0)
>>
>> --
>> Best Regards,
>> Wander Lairson Costa
>> LCoN - Laboratório de Computação Natural - Natural Computing Laboratory
>> (http://www.mackenzie.com.br/lcon.html)
>> Programa de Pós-Graduação em Engenharia Elétrica (PPGEE)
>> Faculdade de Computação e Informática (FCI)
>> Universidade Presbiteriana Mackenzie - SP - Brazil
>>
>>
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