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rs-486 --what should i buy??

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steven334

Joined Aug 9, 2011
37
I have two Arduino unos 300 feet apart and I want to build a three wire rs486 master -slave interface.
Should I buy two

MINIRS422 http://www.futurlec.com/Mini_RS422.shtml
Or

RS485 Shield for Arduino http://www.cutedigi.com/arduino-shields/rs485-shield-for-arduino.html


Or
RS485 RS422 Module MAX485 Interface Board Arduino http://www.ecrater.com/p/13965714/rs485-rs422-module-max485-interface


Or
DFRobot - Arduino IO Expansion Shield http://robosavvy.com/store/product_info.php/products_id/1554/currency/USD

Or something else or is it all the same ???

Thanks steven
 
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