Specifications

Chapter7CommunicationProtocolVFD‐G7SeriesFrequencyInverterOperationManual

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166

TheCRCparityfunctionasfollows;

unsignedintcrc_chk_value(unsignedchar*data_value,unsignedcharlength)

{

unsignedintcrc_value=0xFFFF;

inti;

while(length‐‐)

{

crc_value^=*data_value++;

for(i=0;i<8;i++)

{

if(crc_value&0x0001)

crc_value=(crc_value>>1)^0xA001;

else

crc_value=crc_value>>1;

}

return(crc_value);

}