uwe writes: > RS232 line idle is TX active/high. TX being inverted that tranlates > to nominally -12V ( i.e -3 ... -25 at the receiver ) Yes, but many devices just use 0 for mark and +5 for space and hope. It sort of works. Sometimes. Usually. -- John Hasler jhasler at newsguy.com Dancing Horse Hill Elmwood, WI USA