In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

Tony,

Serial would be a protocol for one SX to one SX.  If however, you need some serious DISTANCE, and want to communicate with multiple SX mcu's (as in one master, many slaves), consider RS-485.  I'm experimenting with some SN75176 chips (about $0.60 ea) and they seem simple enough to get a signal down a very long wire (spec says you can go up to over 4000 feet in some conditions and over 400Mbit/sec on shorter runs).  

I'd highly recommend Jan Axelson's "Serial Complete" book.  She presents the topic very well and my copy is well worn from referencing it often.

Ditto on making it an interrupt.  That's why I'm spending so much time learning how to use interrupts (see my dumb questions in other posts) as they are the secret to getting mcu's to communicate efficiently.

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