modibus 脚本

modibus脚本 'crc16校验代码 Public Function CRC16(ByVal SendStr As String) As String Dim CRC16Lo As Byte, CRC16Hi As Byte 'CRC寄存器 Dim CL As Byte, CH As Byte '多项式码&HA001 Dim SaveHi As Byte, SaveLo As Byte Dim i As Integer, j As Integer Dim Flag As Integer Dim StrLen As Integer Dim TempStr As String Dim Check() As Byte If (SendStr = "") Then Exit Function TempStr = "" For i = 1 To Len(SendStr) TempStr = Mid(Replace(SendStr, " ", ""), i, 1) '将字符串中的空格去掉 Next i StrLen = Len(SendStr) If (StrLen Mod 2) > 0 Then Exit Function '2个字母或数字为一个字节 StrLen = StrLen / 2 - 1 ReDim Check(StrLen) For i = 0 To StrLen Check(i) = Val("&H" + Mid(SendStr, i * 2 + 1, 2) + "&") Next i CRC16Lo = &HFF CRC16Hi = &HFF CL = &H1 CH = &HA0 For i = 0 To UBound(Check) CRC16Lo = CRC16Lo Xor Check(i) '每一个数据与CRC寄存器进行异或 For Flag = 0 To 7 SaveHi = CRC16Hi SaveLo = CRC16Lo CRC16Hi = CRC16Hi \ 2 '高位右移一位 CRC16Lo = CRC16Lo \ 2 '低位右移一位 If ((SaveHi And &H1) = &H1) Then '如果高位字节最后一位为1 CRC16Lo = CRC16Lo Or &H80 '则低位字节右移后前面补1 End If '否则自动补0 If ((SaveLo And &H1) = &H1) Then '如果LSB为1，则与多项式码进行异或 CRC16Hi = CRC16Hi Xor CH CRC16Lo = CRC16Lo Xor CL End If Next Flag Next i Dim ReturnData(1) As Byte ReturnData(0) = CRC16Lo 'CRC低位 ReturnData(1) = CRC16Hi 'CRC高位 CRC16 = SendStr & Hex(ReturnData(0)) & Hex(ReturnData(1)) End Function