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rs 232

Here what I need if some good idea.
I want to display some data like word "DOG" at specific part of LCD 4x20 chr.
The word wil be receive from PC via RS232 to @20Mhz.
Hove to I configure what will be send from PC to PIC ?
I was think to send maybe 1DOG to MCY and maybe decode first number like what line I wil use and next word DOG is what I will show on LCD.Maybe is some good idea also for wich position will be display word etc....

Did someone have good idea for that simple protocol?

Any suggest

Many thanks to all from me..
Tanga