MODBUS专题

原创

  1、C语言MODBUS 16位CRC校验程序：

       const unsigned char auchCRCLo[] = {

               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, 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, 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 

               } ; 

      const char auchCRCHi[] = { 

               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, 0xBE, 0x7E, 

               0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 

               0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 

               0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 

               0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 

               0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 

               0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 

               0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,

               0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 

               0x43, 0x83, 0x41, 0x81, 0x80, 0x40 

               }; 

       //trame : packet with is crc 

       //n: lenght of the packet without the crc

       //answer : return crc word(16bit) 

       int Mb_test_crc(unsigned char trame[],int n) 

      { 

              unsigned char uchCRCHi = 0xFF ; 

              unsigned char uchCRCLo = 0xFF ; 

              unsigned uIndex ;

              unsigned char i;

              for(i=0;i<n;i++) 

             { 

                     uIndex = uchCRCLo ^ trame[i]; 

                     uchCRCLo = uchCRCHi ^ auchCRCLo[uIndex]; 

                     uchCRCHi = auchCRCHi[uIndex] ; 

             } 

             return uchCRCHi<<8|uchCRCLo;

       } 

二、汇编语言（8031）MODBUS 16位CRC校验程序：

      ;入口：R2存放CRC数据的个数
      ; R1存放CRC数据的起始地址 
     ;出口：CRCL,CRCH分别存放结果的低位和高位
     crc16: mov crcl,#0ffh
               mov crch,#0ffh
               crc16x: mov a,@r1
               inc r1
               xrl a,crcl
               push acc
               mov dptr,#auchCRCLo
               movc a,@a+dptr
               xrl a,crch
               mov crcl,a
               mov dptr,#auchCRCHi
               pop acc
               movc a,@a+dptr
               mov crch,a
               djnz r2,crc16x
               ret
     auchCRCLo: db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 001h, 0C0h 
                         db 080h, 041h, 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h 
                         db 000h, 0C1h, 081h, 040h, 000h, 0C1h, 081h, 040h, 001h, 0C0h 
                         db 080h, 041h, 001h, 0C0h, 080h, 041h, 000h, 0C1h, 081h, 040h 
                         db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 000h, 0C1h 
                         db 081h, 040h, 001h, 0C0h, 080h, 041h, 001h, 0C0h, 080h, 041h 
                         db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 000h, 0C1h 
                         db 081h, 040h, 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h 
                         db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 001h, 0C0h 
                         db 080h, 041h, 000h, 0C1h, 081h, 040h, 000h, 0C1h, 081h, 040h 
                         db 001h, 0C0h, 080h, 041h, 001h, 0C0h, 080h, 041h, 000h, 0C1h 
                         db 081h, 040h, 001h, 0C0h, 080h, 041h, 000h, 0C1h, 081h, 040h 
                         db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 001h, 0C0h 
                         db 080h, 041h, 000h, 0C1h, 081h, 040h, 000h, 0C1h, 081h, 040h 
                         db 001h, 0C0h, 080h, 041h, 000h, 0C1h, 081h, 040h, 001h, 0C0h 
                         db 080h, 041h, 001h, 0C0h, 080h, 041h, 000h, 0C1h, 081h, 040h 
                         db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 001h, 0C0h 
                         db 080h, 041h, 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h 
                         db 000h, 0C1h, 081h, 040h, 000h, 0C1h, 081h, 040h, 001h, 0C0h 
                         db 080h, 041h, 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h 
                         db 001h, 0C0h, 080h, 041h, 000h, 0C1h, 081h, 040h, 001h, 0C0h 
                         db 080h, 041h, 000h, 0C1h, 081h, 040h, 000h, 0C1h, 081h, 040h 
                         db 001h, 0C0h, 080h, 041h, 001h, 0C0h, 080h, 041h, 000h, 0C1h 
                         db 081h, 040h, 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h 
                         db 000h, 0C1h, 081h, 040h, 001h, 0C0h, 080h, 041h, 001h, 0C0h
                         db 080h, 041h, 000h, 0C1h, 081h, 040h 
      auchCRCHi: db 000h, 0C0h, 0C1h, 001h, 0C3h, 003h, 002h, 0C2h, 0C6h, 006h
                         db 007h, 0C7h, 005h, 0C5h, 0C4h, 004h, 0CCh, 00Ch, 00Dh, 0CDh 
                         db 00Fh, 0CFh, 0CEh, 00Eh, 00Ah, 0CAh, 0CBh, 00Bh, 0C9h, 009h
                         db 008h, 0C8h, 0D8h, 018h, 019h, 0D9h, 01Bh, 0DBh, 0DAh, 01Ah 
                         db 01Eh, 0DEh, 0DFh, 01Fh, 0DDh, 01Dh, 01Ch, 0DCh, 014h, 0D4h 
                         db 0D5h, 015h, 0D7h, 017h, 016h, 0D6h, 0D2h, 012h, 013h, 0D3h 
                         db 011h, 0D1h, 0D0h, 010h, 0F0h, 030h, 031h, 0F1h, 033h, 0F3h 
                         db 0F2h, 032h, 036h, 0F6h, 0F7h, 037h, 0F5h, 035h, 034h, 0F4h 
                         db 03Ch, 0FCh, 0FDh, 03Dh, 0FFh, 03Fh, 03Eh, 0FEh, 0FAh, 03Ah 
                         db 03Bh, 0FBh, 039h, 0F9h, 0F8h, 038h, 028h, 0E8h, 0E9h, 029h 
                         db 0EBh, 02Bh, 02Ah, 0EAh, 0EEh, 02Eh, 02Fh, 0EFh, 02Dh, 0EDh 
                         db 0ECh, 02Ch, 0E4h, 024h, 025h, 0E5h, 027h, 0E7h, 0E6h, 026h 
                         db 022h, 0E2h, 0E3h, 023h, 0E1h, 021h, 020h, 0E0h, 0A0h, 060h 
                         db 061h, 0A1h, 063h, 0A3h, 0A2h, 062h, 066h, 0A6h, 0A7h, 067h 
                         db 0A5h, 065h, 064h, 0A4h, 06Ch, 0ACh, 0ADh, 06Dh, 0AFh, 06Fh 
                         db 06Eh, 0AEh, 0AAh, 06Ah, 06Bh, 0ABh, 069h, 0A9h, 0A8h, 068h 
                         db 078h, 0B8h, 0B9h, 079h, 0BBh, 07Bh, 07Ah, 0BAh, 0BEh, 07Eh 
                         db 07Fh, 0BFh, 07Dh, 0BDh, 0BCh, 07Ch, 0B4h, 074h, 075h, 0B5h 
                         db 077h, 0B7h, 0B6h, 076h, 072h, 0B2h, 0B3h, 073h, 0B1h, 071h 
                         db 070h, 0B0h, 050h, 090h, 091h, 051h, 093h, 053h, 052h, 092h 
                         db 096h, 056h, 057h, 097h, 055h, 095h, 094h, 054h, 09Ch, 05Ch 
                         db 05Dh, 09Dh, 05Fh, 09Fh, 09Eh, 05Eh, 05Ah, 09Ah, 09Bh, 05Bh 
                         db 099h, 059h, 058h, 098h, 088h, 048h, 049h, 089h, 04Bh, 08Bh 
                         db 08Ah, 04Ah, 04Eh, 08Eh, 08Fh, 04Fh, 08Dh, 04Dh, 04Ch, 08Ch 
                         db 044h, 084h, 085h, 045h, 087h, 047h, 046h, 086h, 082h, 042h 
                         db 043h, 083h, 041h, 081h, 080h, 040h

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