Peter Hansen wrote: > Alejandro wrote: > > > > Yes. The device is very simple (I made it). > > Perhaps a very simple change to it would make it as convenient as the > commercial products. I vaguely recall (not having checked for over a > decade) that all they do is set the outgoing DTR line whenever there is > data being transmitted by the PC, by using something like a 555 timer > with a very short delay (effectively watching the start bit and any zero > bits that are transmitted). There are probably even example circuits > based on this or better approaches available on the net.
You are right. For instance, the 485COSR converter, from B&B electronics, does precisely that. The schematic is in the datasheet (http://tinyurl.com/ro6qy). I will try this route. Thanks for the help. -- http://mail.python.org/mailman/listinfo/python-list
