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connect the serial RX pin in to the rs 485 ic(75176) 's 1st pin and Tx pin of the Atmega
avr conroller to the 4th pin of the 485 ic 2&3 pin of the 485 ic used as control pin short that two pins connect it to the any port pin of the controller(if it is 1 then 485 act as transmiter and if it is 0 485 act as receiver) 7 & 6 of the 485 act as o/p (A&B) this two pins produce the voltage diffrence between the signals .like this make same configuration in the reciever side.... if any doubt contact me..k
All the Best
connect the RX pin of the controller to the rs 485 ic(75176) 's 1st pin and Tx pin of the conroller to the 4th pin of the 485 ic. The 2&3 pin of the 485 ic used as control pins Make the Second pin of the RS-485 grounded and connect the third pin to any port pin of the controller(if it is 1 then 485 act as transmiter and if it is 0 485 act as receiver) and make this 3rd pin pulled down. So, that this connection by default in the reciever mode and when u give one to this pin it will be in transmitter mode. 7 & 6 of the 485 act as o/p (A&B) this two pins produce the voltage diffrence between the signals .like this make same configuration in the reciever side.
you can use max485 for project. there much noise in transmit line so that you have to reduce it.
Added after 8 minutes:
I'm designing Board RTU using atmega128 and interfaching some slave with another. I have to build protocol for this network and i have some exprience in that. but i don't know how to post file in this topic and i'm VietNam. all text is Vietnammess. i will translate it in future. Sorry
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