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Interfacing pic16f877a with HMI(DOP-B07S200) through modbus

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anupama619

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dop-b07s200

can anybody help me for modbus implementation for interfacing pic16f877a with HMI....I studied the modbus protocol,and i created a frame format and i tried to send it, but HMI not accepting it...I done in rtu slave mode,baud rate=9600,rs-232,start bit=1.75ms,stop bit =1.75ms,delay b/n each char is .75ms........plz help...thanks in advance.................
 

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