>From: Mark >and an open protocol. We simply connect multiple PICs together on an RS232 >line. Their is a transmit and a recieve line (just like RS232). The This sounds a little like RS485. I am curious why you decided not to take this route as this would make you more compatible with other products (including the line of home automation modules from Circuit Cellar). YOurs, Ed +---------------------------------------+-----------------------------------+ | Edward Cheung, Ph.D. | The opinions expressed herein | |Satellite Servicing Robotics Laboratory| do not necessarily reflect | | NASA Goddard Space Flight Center | those of my employers' | | Code 714.1, Bldg T11B | | | Greenbelt, MD 20771 | | | 301-286-1269(office) 286-1717(fax) | My next book: | | Internet: cheung@asylum.gsfc.nasa.gov | Statistics, Demos and Other Lies | +---------------------------------------+-----------------------------------+