How to Properly Open a Serial Port in a Function

[bill_z]

Thanks guys.

You showed me the problem in my program. Actually 2 problems.

1st, the statement ser = serial.Serial('/dev/ttyS0', should be port = serial.Serial('/dev/ttyS0'.
2nd, I added the statement port = port_open(port) where appropriate.

I have some more fine tuning but that made all of the difference.

Thanks again.