Here is the link --> http://www.arcelect.com/rs232.htm This site from ARC Electronics will tell you more than you ever wanted to know about RS232 serial connections. Check it out! Darwin (Dar) Piatt - W9HZC Midwest HomeBrewer's and QRP Group http://www.qsl.net/hbqrp <http://www.qsl.net/hbqrp>