Read data from Serial Command

brianrpsgt1 brianlong at cox.net
Sat Oct 11 00:40:08 CEST 2008


Again, what is weird is that all works fine in Hyperterminal, but not
with the Python script.



brianrpsgt1 wrote:
> Gave that a shot....  what is happening is that the script is
> hanging.  Does that mean that the write function is not making it
> through, thus there is nothing to return?
>
>
>
> Grant Edwards wrote:
> > On 2008-10-10, brianrpsgt1 <brianlong at cox.net> wrote:
> > > Thanks for the message
> > >
> > > What exactly is happening is that the return is "None" for the command
> > > that I am sending.  If I connect through Hyperterminal and execute the
> > > 'sh nw enc' command, it returns 'WEP'
> >
> > It looks to me like you're never reading from the serial port.
> > All you're calling is write().
> >
> > Also, are you sure that the device doesn't expect commands to
> > be termined by carriage returns?
> >
> > >> > import serial
> > >> > import time
> > >> >
> > >> > s = serial.Serial(port=1, timeout=None, baudrate=9600)
> > >> > print s
> > >> > time.sleep(5)
> > >> > print "Enter CFG"
> > >> > s.write('CFG')
> > >> > print "Change baud"
> > >> > s.baudrate=115200
> > >> > print s
> > >> > time.sleep(5)
> > >> > print "New line"
> > >> > s.write('\n')
> > >> >
> > >> >
> > >> > time.sleep(2)
> > >> > print "Show Encryption Setting"
> > >> > nw = s.write('sh nw enc')
> > >> > time.sleep(1)
> >
> > Try changing that to
> >
> >      s.write('sh nw enc')
> >      time.sleep(1)
> >      nw = s.read(1024)
> >
> > >> > print nw
> > >> > s.close()
> >
> > There are plenty of example programs at:
> >
> > http://pyserial.svn.sourceforge.net/viewvc/pyserial/trunk/pyserial/examples/
> >
> > --
> > Grant Edwards                   grante             Yow!
> >                                   at               BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-BI-
> >                                visi.com



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