serial port: have to send \n

[edit] Initially I thought this was a pyserial problem but it's not. Basically it's a system problem: Sending anything over the serial port (/dev/ttyS0) would need a "\n" or "\r" or else it'll just be buffered. Below is the original question. Is it a limitation of Linux driver or is there some settings I can change?

Hello there,

I'm trying to use pyserial to write some test code. In reality I'll be transmitting binary data but that's not my problem. My problem is that: it looks like pyserial write() command will only actually send the data when it sees "\n".

Take the following c开发者_如何学Pythonode for sending pure text file.

for l in file:
    print "Sending %s" % l
    s.write( l )
    s.flush()
    time.sleep(2)

Unless I insert s.write("\n") after s.write( l ), nothing would be seen on the other side. Is there a way I can make pyserial to send whatever I want whenever I want it?

Thanks,

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from the documentation for pyserial http://pyserial.sourceforge.net/pyserial_api.html that does not seem to be the case. which version are you using?

to clarify, which pySerial and which python seem to be relevant.