A couple of suggestions:

1) Please don't post HTML to the list. Not everyone uses a web based E-mail
reader to read mail.

2) Especially for what you are doing you may not want to use the 16F84. The
simplest way to handle communcation is to use hardware peripherals, like
a USART, or I2C interface. The 16F84 doesn't have these. However Microchips
newer flash parts, for example the 16F628 or the 16F672, do. And Microchip
has them priced cheaper than the 16F84, at least in the US.

Take a look at using the USART in 9 bit mode with EIA485 (RS485) for
addressible, multidrop communication. But you'll spend a lot for time and
effort doing this with a 16F84.

BAJ

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