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How is the auto enable control implemented in a rs232 to rs485 converter?

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saifmohd

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hi,
i want to develop a rs232 to rs485 converter, i found a schematic here-
on circuit-projects.com(sorry this is my 1st post,nt allowed to post direct links...)
they seem to hav implemented auto enable control using a transistor based circuitry, but no explanation is provided...
so plz can any1 explain how the auto enabl control is implemented here?
 

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