Is it possible to use python to get True Full Duplex on a Serial port?

Diez B. Roggisch deets at
Fri Aug 14 12:54:32 CEST 2009

Hendrik van Rooyen schrieb:
> In the past, on this  group, I have made statements that said that on Linux, 
> the serial port handling somehow does not allow transmitting and receiving at 
> the same time, and nobody contradicted me.
> I am running into the self same issue again.
> What I normally do is to open the port like this:
> port = open("/dev/ttyS0","r+b",0)

How about using pyserial? With that, I never had any problems accessing 
the the serial ports, and AFAIK no duplex-problems as well. And I 
seriously doubt that these are a python-related problem - python only 
has a very thin, direct layer above the posix-calls, and doesn't do 
anything that would explain your observed behavior. The GIL is not the 
issue here either - it won't interfer with blocking IO.


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