GetComState DCB setting EvtChar

[jj]

Hi, I am working with serial port, reading  char by char is working,
but I want to read entire line (my device always sends data delimited
with \r), Setting dbd.EvtChar raises Exception

dcb = GetCommState( self._handle )
dcb.BaudRate = 19200
dcb.EvtChar = 13
-- execption

    dcb.EvtChar = 13
TypeError: illegal argument type for built-in operation

if I change param to :  dcb.EvtChar = '\r'
SystemError: bad memberlist type


Thanks for help in advance.

JJ