CRC16 ModBus Örneği

[dicle_gsm]

Merhaba, 

CRC16 Modbus Örneği, Günde birkaç konu açarak bende Delphi Can'a birazcıkta olsa katkıda bulunmak istedim 

const 
 TableCRC: array[0..255] of word =
  ($0000, $C0C1, $C181, $0140, $C301, $03C0, $0280, $C241, 
   $C601, $06C0, $0780, $C741, $0500, $C5C1, $C481, $0440, 
   $CC01, $0CC0, $0D80, $CD41, $0F00, $CFC1, $CE81, $0E40, 
   $0A00, $CAC1, $CB81, $0B40, $C901, $09C0, $0880, $C841, 
   $D801, $18C0, $1980, $D941, $1B00, $DBC1, $DA81, $1A40, 
   $1E00, $DEC1, $DF81, $1F40, $DD01, $1DC0, $1C80, $DC41, 
   $1400, $D4C1, $D581, $1540, $D701, $17C0, $1680, $D641, 
   $D201, $12C0, $1380, $D341, $1100, $D1C1, $D081, $1040, 
   $F001, $30C0, $3180, $F141, $3300, $F3C1, $F281, $3240, 
   $3600, $F6C1, $F781, $3740, $F501, $35C0, $3480, $F441, 
   $3C00, $FCC1, $FD81, $3D40, $FF01, $3FC0, $3E80, $FE41, 
   $FA01, $3AC0, $3B80, $FB41, $3900, $F9C1, $F881, $3840, 
   $2800, $E8C1, $E981, $2940, $EB01, $2BC0, $2A80, $EA41, 
   $EE01, $2EC0, $2F80, $EF41, $2D00, $EDC1, $EC81, $2C40, 
   $E401, $24C0, $2580, $E541, $2700, $E7C1, $E681, $2640, 
   $2200, $E2C1, $E381, $2340, $E101, $21C0, $2080, $E041, 
   $A001, $60C0, $6180, $A141, $6300, $A3C1, $A281, $6240, 
   $6600, $A6C1, $A781, $6740, $A501, $65C0, $6480, $A441, 
   $6C00, $ACC1, $AD81, $6D40, $AF01, $6FC0, $6E80, $AE41, 
   $AA01, $6AC0, $6B80, $AB41, $6900, $A9C1, $A881, $6840,
   $7800, $B8C1, $B981, $7940, $BB01, $7BC0, $7A80, $BA41,
   $BE01, $7EC0, $7F80, $BF41, $7D00, $BDC1, $BC81, $7C40,
   $B401, $74C0, $7580, $B541, $7700, $B7C1, $B681, $7640,
   $7200, $B2C1, $B381, $7340, $B101, $71C0, $7080, $B041,
   $5000, $90C1, $9181, $5140, $9301, $53C0, $5280, $9241,
   $9601, $56C0, $5780, $9741, $5500, $95C1, $9481, $5440,
   $9C01, $5CC0, $5D80, $9D41, $5F00, $9FC1, $9E81, $5E40,
   $5A00, $9AC1, $9B81, $5B40, $9901, $59C0, $5880, $9841,
   $8801, $48C0, $4980, $8941, $4B00, $8BC1, $8A81, $4A40,
   $4E00, $8EC1, $8F81, $4F40, $8D01, $4DC0, $4C80, $8C41,
   $4400, $84C1, $8581, $4540, $8701, $47C0, $4680, $8641,
   $8201, $42C0, $4380, $8341, $4100, $81C1, $8081, $4040);

function ModbusCRC16(const s: String): Word;
var
 b: Byte;
 i: Integer;
begin
 Result := $FFFF;
 for i := 1 to Length(s) do
 begin
   b := Ord(s[i]) xor Result;
   Result := Result shr 8 xor TableCRC;
 end;
end;

[b]Kullanımı : 

var
c1: Word;
block : string;
begin
block := Chr($5a)+Chr($02);

c1:=ModbusCRC16(block);
Showmessage(Format('%.2X',[c1]));

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