problem with serial port

hi,

I want to get a message from the serial port but I don’t manage to:

SER.set_speed(‘115200’)

b=SER.receive(500)

print b

with this script I only can receive one letter but i would like to receive a message like “every thing is good”. I also try with SER.read() instead of SER.receive(500) but I receive nothing.

so, if somebody have an idea…

thanks a lot

Jérôme