CRC16算法

A (范围0X00-0XFF),表示指定传感器的16进制地址,一字节 30 功能码(十六进制) CC CRC16校验码 回答:A3004(data)CC

A (范围0X00-0XFF),表示指定传感器的16进制地址,一字节 30 功能码(十六进制) 04 数据字节长度

data 四字节数据,表示信号的测量值 CC CRC16校验码

命令集中所有数据均为16进制表示

以前只做过串口读取ascii码的数据,没做过读取16进制数据,不知道怎么发送请求命令,并读取数据.还有数据是16进制的,在控件上要不要设什么

还有最后的crc16效验码不知道怎么生成,网上看见些现成的crc16函数,但不知道怎么和这问题结合起来

高手帮帮我啊,我一般使用cnrs232控件(spcomm的修改版) var

buf: array[0..4] of byte; procedure send; begin buf[0]:=$01; buf[1]:=$30; buf[2]:=..; senddata(buf); end;

procedure senddata(sbuf:array of byte); begin

if not comm1.WriteCommData(@sbuf,length(sbuf)) then begin

showmessage('发送错误'); end; end;

刚找到crc16算法

unit CRCUnit;

interface uses

Windows,SysUtils; type

PBYTE =^Byte;

//计算CRC检验码

function Get_CRC16(const pData:Pointer;nLength:Integer):string; //检验函数

function Check_CRC16(const pData:Pointer;nLength:Integer):Boolean; //获取指定字符串的CRC验证码

function Get_CRC16Code(strValue : string) : string; const

//16位的CRC检验表

CRCTable16 : array[0..255] of Word = (

$0000, $11, $2312, $329b, $4624, $57ad, $6536, $74bf, $8c48, $9dc1, $af5a, $bed3, $ca6c, $dbe5, $e97e, $f8f7, $1081, $0108, $3393, $221a, $56a5, $472c, $75b7, $3e, $9cc9, $8d40, $bfdb, $ae52, $daed, $cb, $f9ff, $e876, $2102, $308b, $0210, $1399, $6726, $76af, $4434, $55bd, $ad4a, $bcc3, $8e58, $9fd1, $eb6e, $fae7, $c87c, $d9f5, $3183, $200a, $1291, $0318, $77a7, $662e, $b5, $453c, $bdcb, $ac42, $9ed9, $8f50, $fbef, $ea66, $d8fd, $c974, $4204, $538d, $6116, $709f, $0420, $15a9, $2732, $36bb, $ce4c, $dfc5, $ed5e, $fcd7, $8868, $99e1, $ab7a, $baf3, $5285, $430c, $7197, $601e, $14a1, $0528, $37b3, $263a, $decd, $cf44, $fddf, $ec56, $98e9, $60, $bbfb, $aa72, $6306, $728f, $4014, $519d, $2522, $34ab, $0630, $17b9, $ef4e, $fec7, $cc5c, $ddd5, $a96a, $b8e3, $8a78, $9bf1, $7387, $620e, $5095, $411c, $35a3, $242a, $16b1, $0738, $ffcf, $ee46, $dcdd, $cd, $b9eb, $a862, $9af9, $8b70, $8408, $9581, $a71a, $b693, $c22c, $d3a5, $e13e, $f0b7, $0840, $19c9, $2b52, $3adb, $4e, $5fed, $6d76, $7cff, $94, $8500, $b79b, $a612, $d2ad, $c324, $f1bf, $e036, $18c1, $0948, $3bd3, $2a5a, $5ee5, $4f6c, $7df7, $6c7e, $a50a, $b483, $8618, $9791, $e32e, $f2a7, $c03c, $d1b5, $2942, $38cb, $0a50, $1bd9, $6f66, $7eef, $4c74, $5dfd, $b58b, $a402, $9699, $8710, $f3af, $e226, $d0bd, $c134, $39c3, $284a, $1ad1, $0b58, $7fe7, $6e6e, $5cf5, $4d7c, $c60c, $d785, $e51e, $f497, $8028, $91a1, $a33a, $b2b3,

$4a44, $5bcd, $6956, $78df, $0c60, $1de9, $2f72, $3efb, $d68d, $c704, $f59f, $e416, $90a9, $8120, $b3bb, $a232, $5ac5, $4b4c, $79d7, $685e, $1ce1, $0d68, $3ff3, $2e7a, $e70e, $f687, $c41c, $d595, $a12a, $b0a3, $8238, $93b1, $6b46, $7acf, $48, $59dd, $2d62, $3ceb, $0e70, $1ff9, $f78f, $e606, $d49d, $c514, $b1ab, $a022, $92b9, $8330, $7bc7, $6a4e, $58d5, $495c, $3de3, $2c6a, $1ef1, $0f78);

implementation

function Get_CRC16(const pData:pointer;nLength:Integer):string; var fcs : Word; p : PBYTE; begin

p := PBYTE(pData); fcs := $ffff; while(nLength>0)do begin

fcs := (fcs shr 8) xor CRCTable16[(fcs xor p^) and $ff]; Dec(nLength); Inc(p); end;

Result := IntToStr(not fcs); end;

function Check_CRC16(const pData:Pointer;nLength: Integer):Boolean; var fcs:Word; p:PBYTE; begin

p := PBYTE(pData); fcs := $ffff;

while(nLength>0) do begin

fcs := (fcs shr 8) xor CRCTable16[(fcs xor p^) and $ff]; Dec(nLength); Inc(p); end; end;

function Get_CRC16Code(strValue : string) : string; var crc , i:Word;

begin crc := 0;

for i:= 1 to length(strValue) do begin

crc := CRCTable16[(Byte(crc shr 8) and $ff) xor (ord(strValue[i]) and $ff)] xor (crc shr 8); end;

Result := IntTohex(crc,2); end;

引用 13 楼 yuqianyi1974 的回复: var f:single;

b:array[0..3] of byte;//b[0]:=rbuf[3]还是b[0]:=rbuf[0] begin

move(b,f,sizeof(f)); end;

b中的顺序要变一下，你试一下