Pyserial never read

[luca72]

Hello at all
sorry for my english but i'm Italian.
I use pyserial to communicate via rs232 with an extarnal device called
smartmouse.
I write the exact line that i want , but when i read i read only the
echo ond not the other bytes.
When i meke the same project with delphi i solve this problem with the
call of the sleep.
But in python it don't work.
Have you got some ideas for solve my problem?

Best Regards

Luca

[jdhmistey@gmail.com]

Re: Pyserial never read

I don't know alot about python but I could help you with english?
eventhough it was really good

best regards-
Just

[luca72]

Re: Pyserial never read

Thanks

Luca

[francois.schnell@gmail.com]

Re: Pyserial never read

Hello,

I'm not sure I understand precisely your question but maybe you can try
a readline and a flushinput like that:

import serial

port= 0 # or the port where you're device is connected
baudrate=9600 # or the baudrate of your device

s = serial.Serial(p ort, baudrate) # Open the port

for i in range(100):
s.flushInput()
line= s.readline()
print line

[luca72]

Re: Pyserial never read

Thanks for your help, but it don't solve the problem.
I receive only the echo and full stop.

Many Thanks

Best Regards

Luca

[Nick Craig-Wood]

Re: Pyserial never read

luca72 <lucaberto@libe ro.it> wrote:[color=blue]
> Thanks for your help, but it don't solve the problem.
> I receive only the echo and full stop.[/color]

Try swapping pins 2 and 3 in the lead.

--
Nick Craig-Wood <nick@craig-wood.com> -- http://www.craig-wood.com/nick

[Peter Hansen]

Re: Pyserial never read

Nick Craig-Wood wrote:[color=blue]
> luca72 <lucaberto@libe ro.it> wrote:
>[color=green]
>> Thanks for your help, but it don't solve the problem.
>> I receive only the echo and full stop.[/color]
>
> Try swapping pins 2 and 3 in the lead.[/color]

Anything's possible, but given that in his original post he says it
works when he uses Delphi, it seems unlikely making a change to the
hardware is necessary.

-Peter

[Peter Hansen]

Re: Pyserial never read

luca72 wrote:[color=blue]
> Thanks for your help, but it don't solve the problem.
> I receive only the echo and full stop.[/color]

If you want help, you'll do better to post small pieces of code that you
are actually using, rather than making us guess or imagine what you are
doing. There are perhaps a dozen things that can go wrong with serial
communications, and it's not efficient for us to start suggesting them
one at a time...

-Peter

[Nick Craig-Wood]

Re: Pyserial never read

Peter Hansen <peter@engcorp. com> wrote:[color=blue]
> Nick Craig-Wood wrote:[color=green]
> > luca72 <lucaberto@libe ro.it> wrote:
> >[color=darkred]
> >> Thanks for your help, but it don't solve the problem.
> >> I receive only the echo and full stop.[/color]
> >
> > Try swapping pins 2 and 3 in the lead.[/color]
>
> Anything's possible, but given that in his original post he says it
> works when he uses Delphi, it seems unlikely making a change to the
> hardware is necessary.[/color]

Sorry missed that bit!

Pyserial works very well in my experience (under linux).

Serial ports are generally a pain though ;-)

--
Nick Craig-Wood <nick@craig-wood.com> -- http://www.craig-wood.com/nick

[luca72]

Re: Pyserial never read


Thanks to all for the help,

here you find the code, pls note if i use handshaking = 1 the
application don't start.
in the delphi configuratio of com port if i use or not handshaking the
application work.
Best Regards at all

Luca

import serial
import win32file
port = 2
baudrate = 38400
bytesize =serial.EIGHTBI TS
parity =serial.PARITY_ ODD
stopbits =serial.STOPBIT S_TWO
timeout = 1
ser = serial.Serial(2 , baudrate=38400, bytesize=8,
parity=serial.P ARITY_ODD, stopbits=2, timeout=3)
ct = ''
ch = ''
a = self.textCtrl1. GetValue()
ind = 0
ind1 = 2
lunghezza = len(a)
while ind < lunghezza :
b = a[ind:ind1]
b = int(b,16)
b = ~b
c = ''.join([str((b >> Digit) & 1) for Digit in range(7,
-1, -1)])
c1 = c[0:4]
c2 = c[4:]
c1 = c1[3:] + c1[2:3] + c1[1:2] + c1[0:1]
c2 = c2[3:] + c2[2:3] + c2[1:2] + c2[0:1]
c1 = hex(int(c1,2))
c2 = hex(int(c2,2))
c1 = c1[2:]
c2 = c2[2:]
c = c2+c1
ct = ct + c
ind = ind + 2
ind1 = ind1 + 2
c = int(c,16)
c = chr(c)
ch = ch + c


ser.write(ch)

elf.textCtrl2.S etValue(ct)
ser.readline()



Pls.Note i hove also try with read(number of byte ) with inWaiting(),
flush etc........


But no result.

Thanks Luca

[Grant Edwards]

Re: Pyserial never read

On 2006-02-22, Nick Craig-Wood <nick@craig-wood.com> wrote:
[color=blue][color=green]
>> Anything's possible, but given that in his original post he says it
>> works when he uses Delphi, it seems unlikely making a change to the
>> hardware is necessary.[/color]
>
> Sorry missed that bit!
>
> Pyserial works very well in my experience (under linux).[/color]

I've used it extensively under both Linux and Win32, and it
works very well under both.
[color=blue]
> Serial ports are generally a pain though ;-)[/color]

That's the truth.

--
Grant Edwards grante Yow! Somewhere in Tenafly,
at New Jersey, a chiropractor
visi.com is viewing "Leave it to
Beaver"!

[Petr Jakes]

Re: Pyserial never read

Well, I think it is better to start with some simple code first.
Try to read serial port and print it out.
something like this could work:

import serial

s = serial.Serial(p ort=2,baudrate= 38400, timeout=20)

while 1:
print s.readline()

Petr Jakes

[sam]

Re: Pyserial never read

luca72 wrote:[color=blue]
> Thanks to all for the help,
>
> here you find the code, pls note if i use handshaking = 1 the
> application don't start.
> in the delphi configuratio of com port if i use or not handshaking the
> application work.
> Best Regards at all
>
> Luca
>
> import serial
> import win32file
> port = 2[/color]

Is port = 2 correct?
I thought that com ports under windows are designated as a string
"com1","com2",. .etc.
[color=blue]
> baudrate = 38400
> bytesize =serial.EIGHTBI TS
> parity =serial.PARITY_ ODD
> stopbits =serial.STOPBIT S_TWO
> timeout = 1
> ser = serial.Serial(2 , baudrate=38400, bytesize=8,
> parity=serial.P ARITY_ODD, stopbits=2, timeout=3)
> ct = ''
> ch = ''
> a = self.textCtrl1. GetValue()
> ind = 0
> ind1 = 2
> lunghezza = len(a)
> while ind < lunghezza :
> b = a[ind:ind1]
> b = int(b,16)
> b = ~b
> c = ''.join([str((b >> Digit) & 1) for Digit in range(7,
> -1, -1)])
> c1 = c[0:4]
> c2 = c[4:]
> c1 = c1[3:] + c1[2:3] + c1[1:2] + c1[0:1]
> c2 = c2[3:] + c2[2:3] + c2[1:2] + c2[0:1]
> c1 = hex(int(c1,2))
> c2 = hex(int(c2,2))
> c1 = c1[2:]
> c2 = c2[2:]
> c = c2+c1
> ct = ct + c
> ind = ind + 2
> ind1 = ind1 + 2
> c = int(c,16)
> c = chr(c)
> ch = ch + c
>
>
> ser.write(ch)
>
> elf.textCtrl2.S etValue(ct)
> ser.readline()[/color]
You might want to try using ser.read() instead of ser.readline() as
you may not be getting linefeed carrage return characters . I usually
setup a buffer to scan for the characters I expect.
[color=blue]
>
>
>
> Pls.Note i hove also try with read(number of byte ) with inWaiting(),
> flush etc........
>
>
> But no result.
>
> Thanks Luca[/color]

Hope this helps
Sam Schulenburg

[Grant Edwards]

Re: Pyserial never read

On 2006-02-22, sam <samschul@pacbe ll.net> wrote:[color=blue]
> luca72 wrote:[color=green]
>> Thanks to all for the help,
>>
>> here you find the code, pls note if i use handshaking = 1 the
>> application don't start.
>> in the delphi configuratio of com port if i use or not handshaking the
>> application work.
>> Best Regards at all
>>
>> Luca
>>
>> import serial
>> import win32file
>> port = 2[/color]
>
> Is port = 2 correct?[/color]

Read the fine documentation at http://pyserial.sourceforge.net/:

Parameters for the Serial class

ser = serial.Serial(
port=None, #number of device, numbering starts at
#zero. if everything fails, the user
#can specify a device string, note
#that this isn't portable anymore
#if no port is specified an unconfigured
#an closed serial port object is created
baudrate=9600, #baudrate
bytesize=EIGHTB ITS, #number of databits
parity=PARITY_N ONE, #enable parity checking
stopbits=STOPBI TS_ONE, #number of stopbits
timeout=None, #set a timeout value, None for waiting forever
xonxoff=0, #enable software flow control
rtscts=0, #enable RTS/CTS flow control
)
[color=blue]
> I thought that com ports under windows are designated as a string
> "com1","com2",. .etc.[/color]

You can use those as well, but they're non-portable.
serial.Serial(p ort=0) will open the first serial port on either
windows or linux.

--
Grant Edwards grante Yow! Ha ha Ha ha Ha ha
at Ha Ha Ha Ha -- When will I
visi.com EVER stop HAVING FUN?!!

[sam]

Re: Pyserial never read

Thanks for the info Grant. It'll teach me not to read the documentation
:>)

Sam