a b wrote: > I have a pain in the a** problem with pyserial- it works 90% of time > but on the 10% of time it thorows and termios.error exception with the > value (5, 'Input/output error') and i cannot get rid of it :( > The system works as follows: > A device sends out rs485 data -> rs485 to rs232 converter converts it - >> an rs232->usb cable attatched to a computer reads the data. Until > now it hasn't bothered me too much since it hasn't been a lot of data > (every time i get this exception i unload the pl2303 module from > kernel, then reload it, open the com port and hope it won't happen > soon). But now the amount of data is getting bigger and the exceptions > in the log are quite bothering already so if anyone has a good idea > what could affect it i'd be very glad... > oh and the settings for the port opening are: > self.ser = serial.Serial(self.port, self.baudrate, rtscts=0, > xonxoff=0, timeout=0)
Did you try a different usb2serial-converter? I've got plenty of them used in the past few years, and frankly, they mostly suck. Big time. With them, all kinds of timing-issues and other problems arose, and some hardware refused to outright work with them. So, I suggest you try & get a hold on as many usb2serial-converters you can get from friends and colleagues, and try out which one works best. There is nothing on the software-side you can do (short from lowering the bps, as this might cover up for some issues due to relaxed timing. But I had to cut down to like 2400 bps or some crap like that, which isn't really usable) Diez -- http://mail.python.org/mailman/listinfo/python-list
