CRC计算示例（帧02 07）XOR =异或N =字节的信息位POLY = CRC 16 多项式计算 =1010 0000 0000 0001（生成多项式=1 + x 2 + x 15 + x 16）在CRC 16中，发送的第一个字节为低字节CRC寄存器初始化11110000111100001111000011110000XORH-一个字符1111111111111101移位10111111111111110 11010000000000001标志1 ,XOR 多项式1101111111111111移位20110111111111111 1标志1,XOR多项式10100000000000011100111111111110移位30110011111111110 0移位40011001111111111 110100000000000011001001111111110移位50100100111111111 0移位60010010011111111 110100000000000011000010011111110移位70100001001111111 0移位80010000100111111 0101000000000000110000001001111100000000000000111XOR第二个字符1000000100111001移位10100000010011100 110100000000000011110000010011101移位20111000001001110 110100000000000011101000001001111移位30110100000100111 110100000000000011100100000100110移位40110010000010011 0移位50011001000001001 110100000000000011001001000001000移位60100100100000100 0移位70010010010000010 0移位80001001001000001 0最图功效最低功效帧的CRC 16则为：4112例执行CRC生成的C语言的函数在下面示出。
所有的可能的 CRC值都被预装在两个数组中，当计算报 文内容时可以简单的索引即可一个数组含有 16位CRC域的所有256个可能的高位字节，另一个数组含 有地位字节的值这种索引访问CRC的方式提供了比对报文缓冲区的每个新字符都计算新的 CRC更快的方法注意：此函数内部执行高/低CRC字节的交换此函数返回的是已经经过交换的 CRC值也就是说，从该函数返回的 CRC值可以直接放置于报文用于发送函数使用两个参数unsigned char *puchMsg; 指向含有用于生成 CRC 的二进制数据报文缓冲区的指针unsigned short usDataLen; 报文缓冲区的字节数 .CRC生成函数类型返回unsigned short CRC16 ( puchMsg ， usDataLen ) /* 函数以 unsigned shortCRC */unsigned char *puchMsg ;* /unsigned short usDataLen ;* /{unsigned char uchCRCHi = 0xFF ;* /unsigned char uchCRCLo = 0xFF ;* /unsigned uIndex ;* //* 用 于 计 算 CRC/* 报 文 中 的/* CRC 的 高 字 节/* CRC 的 低 字 节/* CRC 查 询 表while (usDataLen--)/* 完 成 整 个 报 文报文节数初始化初始化索引缓冲区*/{CRCulndex = uchCRCLo A *puchMsgg++ ; /* 计 算*/uchCRCLo = uchCRCHi A auchCRCHi[uIndex} ;uchCRCHi = auchCRCLo[uIndex] ;}return (uchCRCHi << 8 | uchCRCLo) ;}高字节表/* 高位字节的 CRC 值 */static unsigned char auchCRCHi[] = {0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00,0xC1, 0x81,0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,0x01, 0xC0,0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81,0x40, 0x01,0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00,0xC1, 0x81,0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,0x01, 0xC0,0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80,0x41, 0x01,0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,0x81, 0x40,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00,0xC1, 0x81,0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x01, 0xC0,0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81,0x40, 0x01,0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00,0xC1, 0x81,0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,0x01, 0xC0,0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80,0x41, 0x01,0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,0x80, 0x41,0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00,0xC1, 0x81,0x40} ;低字节表/* 低位字节的 CRC 值 */static char auchCRCLo[] = {0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05,0xC5, 0xC4,0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B,0xC9, 0x09,0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF,0x1F, 0xDD,0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12,0x13, 0xD3,0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36,0xF6, 0xF7,0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE,0xFA, 0x3A,0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A,0xEA, 0xEE,0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7,0xE6, 0x26,0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63,0xA3, 0xA2,0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D,0xAF, 0x6F,0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9,0x79, 0xBB,0x7B, 0x7A, 0xBA, 0。