The W1GEE interface requires power from the COM port. Does NA drive the RTS or DTR lines, whichever signal that the interface requires for power? Dave? 73 - Jim AD1C -- Jim Reisert AD1C, 7 Charlemont Court, North Chelmsford, MA 01863 USA +978-251-9933, <jjreisert@alum.mit.edu>, http://www.ad1c.com