Data formats 49© 2017 Nortek ASC-style Header Struct Definitiontypedef struct{unsigned char sync;unsigned char hdrSize;unsigned char ID;unsigned char family;unsigned short dataSize;unsigned short dataChecksum;unsigned short hdrChecksum;} CommandHeader_t;6.1.1 Checksum DefinitionThe Checksum is defined as a 16-bits unsigned sum of the data (16 bits). The sum shall beinitialized to the value of 0xB58C before the checksum is calculated.C-code for Checksum calculations:unsigned short calculateChecksum(unsigned short *pData, unsignedshort size){unsigned short checksum = 0xB58C;unsigned short nbshorts = (size >> 1);int i;for (i = 0; i < nbshorts; i++){checksum += *pData;size -= 2;pData++;}if (size > 0){checksum += ((unsigned short)(*pData)) << 8;}return checksum;}
