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Modbus Communication

ASDA-A3

9

outportb(PORT+BRDH,0x00);

outportb(PORT+LCR,0x06);

/* set protocol

<7,E,1> = 1AH,

<8,N,2> = 07H

<8,O,1> = 0BH

<7,O,1> = 0AH

<8,E,1> = 1BH

*/

for( I = 0; I<=16; I++ ) {

while( !(inportb(PORT+LSR) & 0x20) ); /* wait until THR empty */

outportb(PORT+THR,tdat[I]);

/* send data to THR */

}

I = 0;

while( !kbhit() ) {

if( inportb(PORT+LSR)&0x01 ) { /* b0==1, read data ready */

rdat[I++] = inportb(PORT+RDR); /* read data from RDR */

}

}

}

9-14

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