At 10:55 AM 5/13/02 -0700, Larry McKibben wrote: >Hi Folks, > >I'm a PIC newbie. This is my first question to the PIC list. I signed up and >have been reading the list for about a month and a half. Glad to have you on board! >I want to use a 16F76 as a master for a burglar/fire home alarm system. I >want >to have maybe 4 16F628's around the house for remote access. Using the USART >functionality, the 4 remote transmitters would be electrically be in >parallel to >the 16F76's receiver input. The data sheet does not state the 16F628 USART/TX >(RB2 - pin 8) as open drain. Will paralleling them be a problem? Yes - tying the TX pins directly together is a problem. What data (baud) rate do you want to use? How far between nodes and what is the total path length? What kind of stresses (ESD, transients, etc) will the nodes be subject to? >I don't believe there is a concern in the opposite direction, that is 4 16F628 >RX inputs electrically in parallel from the 16F76 TX. You are correct - no problem at all. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 18 years of Engineering Innovation (1984 - 2002) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics