In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: I usually find that it is the serial cable that is connecting the grounds together. (That is ground on the circuit to ground on the computer). If you don't have anything connecting ground on your circuit to ground on the computer, you should be okay connecting the black lead to non-ground on the circuit. Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=128222#m128321 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)