Modbus CRC 校验

 

public static byte[] CRC16(byte[] data)

{

byte[] temdata = new byte[data.Length + 2];

int xda, xdapoly;

int i, j, xdabit;

xda = 0xFFFF;

xdapoly = 0xA001;

for (i = 0; i < data.Length; i++)

{

xda ^= data[i];

for (j = 0; j < 8; j++)

{

xdabit = (int)(xda & 0x01);

xda >>= 1;

if (xdabit == 1)

xda ^= xdapoly;

}

}

Array.Copy(data, 0, temdata, 0, data.Length);

temdata[temdata.Length - 2] = (byte)(xda & 0xFF);

temdata[temdata.Length - 1] = (byte)(xda >> 8);

//temdata[temdata.Length - 2] = (int)(xda & 0xFF);

//temdata[temdata.Length - 1] = (int)(xda >> 8);

return temdata;

}