En Wed, 05 Dec 2007 10:19:51 -0300, hari <[EMAIL PROTECTED]> escribi�:
> Hi all,
> I need to automate printer command testing, prinetr supports
> parallel/
> serial/USB.How can i send the commands from python to printer.
>
> I have got pyparallel, as am new to python, no idea how to work on
> it.
> Please give some tips,The comamnd to be sent to the printer is hex
> data "1B 40".please give a example,it will be grateful.
a) how to control the printer port:
You should look for some info on the protocol and timings. I vaguely
remember that you should write the desired data onto the eight data lines,
then set the STROBE control signal for some time, then reset the signal.
Something like this:
import parallel
port = parallel.Parallel()
def send_to_printer(bytes):
for byte in bytes:
port.setData(ord(byte))
port.setDataStrobe(1)
sleep(...)
port.setDataStrobe(0)
sleep(...)
send_to_printer("Hello world\r\n")
You'll have to look for the right values to sleep in each case. Those 1/0
may be reversed too.
b) how to convert hex data:
The easiest way would be: send_to_printer("\x1B\x40")
If you have the string "1B 40" already built:
def hex_to_raw(hex):
return ''.join([chr(int(num,16)) for num in hex.split()])
data = "1B 40"
send_to_printer(hex_to_raw(data))
--
Gabriel Genellina
--
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