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[MOVED]Receiving zero(0) in uart interrupt after end of the rs485 transmit

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kudiarasu

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Hi all

i am facing problem in rs485 serial data receiving in uart , After 1 or 2 minutes later from unit power up i am receiving unknown value before the valid frame, Even no slave has connected i receiving 1 byte of unknown value , i wonder why the issue arises in 1 or 2 minutes of power up.

i used the following components
micro-controller :luminary lm3s6965
485 driver : max485/75176
pullup resistor : 10k/4.5
vcc :+5vcc
 

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