I have noticed that there are 2 different Zener Diodes ( a 5.1 volt and a 4.7 volt) being mentioned in schematics for the Serial link. Which one is the right one? Does it Have to be a 1W or Can it be a 500mW Diode? Thanks in Advance for any help, Wyatt _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com