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serial communication with 8051 by 485

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I use the 8051 with the at 9600 baud rate.
i give the SCON = 0X50;
I did't give any value for PCON
I use a board with 5volt only. in this board it communicate properly .But when i use 5v for controller and 12 v for port out put this is not working. I am using 485 protocol .
 

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