Sending null byte to serial port in Windows using PySerial?

[Chris Liechti]

sundae1888 at hotmail.com (sundae) wrote in
news:49f4e27a.0211020033.6d7b66ac at posting.google.com: 
>> > com = serial.Serial("COM1", 9600, timeout=1)
>> > com.write(chr(0))
> So that *is* the way to send a null byte?  I was wondering if I
> screwed up there (and/or that WriteFile() doesn't support null byte).

yes if you have a longer string with other data you can also insert a null 
byte with "\0" or "\x00" etc. it's all the same.

> Since it's easier to test case (b), my question is, would inWaiting()
> detect a byte even if the timeout is too fast?

inWaiting() return the number of characters in the buffer that the OS has. 
characters disapear from the buffer if you read them or if you flush the 
buffer. so yes, if your read() call would return too fast and characters 
arrived after that and then you did a inWaiting() it should return a 
nonzero value.

chris
-- 
Chris <cliechti at gmx.net>