RE: Accessing USB thermometer sensor

["Josh Hammond" <jhammond-qGaTmy9+pjn8wb0/L2CcF0B+6BGkLq7r@public.gmane.org>]

On Mon, June 23, 2008 9:20 am, Tosoni wrote:
>> the right direction to be able to read the temperature from command line?
>> Josh
>>
> Reading a serial device from the commannd line is not easy.
> First because each command you type closes the port after running and so it
> flushes buffers.
>
> I would suggest using shell parenthesis to group the commands
> Use stty to set the port to raw mode etc.
> Use 'echo' and 'dd' which is like 'cat' but much more configurable for
buffer sizes
> something like:
> ( stty 9600 raw; echo 'request'; dd bs=1 count=10 >response.out)
</dev/serialusb >&0
>
>

Unfortunately it doesn't seem to work.
This is the general output (I tried several tty speeds):

osmosis:/home/josh# ( stty 9600 raw; echo 'request'; dd bs=1 count=10
>response.out) < /dev/ttyUSB0 >&0

bash: echo: write error: Bad file descriptor
0+0 records in
0+0 records out
0 bytes (0 B) copied, 32.3506 s, 0.0 kB/s



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