Instruction manual

ManualsBrandsMasterflex ManualsComputer equipmentHANDY-700

IrDA Protocol

1. Transmission control character

SYMBOL VALUE SYMBOL VALUE

SOH

STX

ETX

PR_RES(ACK)

PR_RES(NAK)

01h

02h

03h

06h

15h

PR_RES(WAIT)

PR_START

PR_END

PR_DATA

PR_STAT

3Bh

31h

32h

33h

34h

2. FCS Calculation

2.1 Polynomial(CCITT X.25 )

2.2 Examination( "C" Language)

union u_crc{

unsigned char low;

unsigned char buf[2];

unsigned int value;

}crc;

unsigned int crctable[260];

void Crc(unsigned char value){ crc.value=crc.buf[1] ^ crctable[crc.low^value] ;}

void CrcTableMake(void){

unsigned int i,j,k;

for(i=0;i<256;i++){

k=i;

for(j=0;j<8;j++){

if(k&1) k=(k>>1)^0x8408U;

else k>>=1;

}

crctable[i]=k;

}

void main(void){

crc.value=0xFFFFU; //Init

Crc(0x30);

Crc(0x31);

printf("Result:0x%04X\n",crc.value^0xFFFFU);

}

3. Transmmission Format

3.1 Status check

 <State Response>

<State Command > 