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Signal Buffer/booster

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Micro Lover

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hi every one

i m trying to design a digital clock. One Master-Clock that will send a serial data at 9600 baud-rate, and slave clocks will receive the data and will display it, for Master-Clock, I used AT89C51 and for Slave-Clock AT89C2051.

The most near Slave-Clock is approximately 12-15 feet, but the last one is approximately 300 feet far. my idea is to use coaxial-cable, (for common ground and signal)
------------------
Questions?
1) Will i need any buffer/booster to send data at the last end and receive it perfectly?
1-i) If Yes, so how can i boost it?

2) Is Coaxial Cable is good for this purpose

Thanks
 

Many companies manufacture RS485 transceivers, symmetrical cable should be used . You can use one circuit like 75176, 26LS32, LTC1685, LTC1484, MAX3483, MAX3362.

http://cds.linear.com/docs/Datasheet/1685fa.pdf
http://www.datasheetcatalog.org/datasheet/maxim/MAX3362.pdf

read this:
https://www.edaboard.com/threads/126212/

LTC488-circuits.jpg
 

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