Sept. 1, 2010
3:57 a.m.
I have been able to do serial I/O on Windows, but not Linux. Running in a terminal to capture output yields "Error while saving old state" while trying to open just about any number or name I can think of (including 0 and /dev/ttyS0), but the open method gives no indication that there is a problem; it returns a perfectly valid looking serial port with the #port set to whatever it was given. Subsequent reads fail, and are probably a bit more honest about what is happening: "Error while reading: serial port is not open." I am not sure whether that is always the case, but it certainly is on this machine when I try /dev/ttyUSB0, which does not exist here. Any ideas? Bill