Dar- Wednesday, June 16, 2004, 5:34:49 PM, you wrote: DS> The rts=on and dtr=off are unusual. DS> I suspect the weather station is using those to provide the voltages DS> for its transmit line. Maybe it is using those for all power. Or, as in x10, it is maybe using rts and dtr for a handshaking protocol. -- -Mark Wieder mwieder at ahsoftware.net