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]

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

best regards-
Just

[luca72]

Thanks

Luca

[francois.schnell]

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]

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]

luca72 <lu*******@libe ro.it> wrote:

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

Try swapping pins 2 and 3 in the lead.

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

[Peter Hansen]

Nick Craig-Wood wrote:

luca72 <lu*******@libe ro.it> wrote:

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

Try swapping pins 2 and 3 in the lead.

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]

luca72 wrote:

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

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]

Peter Hansen <pe***@engcorp. com> wrote:

Nick Craig-Wood wrote:

luca72 <lu*******@libe ro.it> wrote:

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

Try swapping pins 2 and 3 in the lead.

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.

Sorry missed that bit!

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

Serial ports are generally a pain though ;-)

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

[luca72]

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