在使用hostlink与欧姆龙PLC串口通信，发送报文时需要进行XOR校验，校验失败报文命令不会正常执行，所以动态计算校验值非常必要。
XOR校验又叫按位异或求和，顾名思义，按位、异或、求和。C#代码如下，直接复制就能使用。
复制
public class BytesCheck
{
#region 校验和
/// <summary>
/// 计算按位异或校验和（返回校验和值）
/// </summary>
/// <param name="Cmd">命令数组</param>
/// <returns>校验和值</returns>
public static byte GetXOR(byte[] Cmd)
{
byte check = (byte)(Cmd[0] ^ Cmd[1]);
for (int i = 2; i < Cmd.Length; i++)
{
check = (byte)(check ^ Cmd[i]);
}
return check;
}
/// <summary>
/// 计算按位异或校验和（返回包含校验和的完整命令数组）
/// </summary>
/// <param name="Cmd">命令数组</param>
/// <returns>包含校验和的完整命令数组</returns>
public static byte[] GetXORFull(byte[] Cmd)
{
byte check = GetXOR(Cmd);
List<byte> newCmd = new List<byte>();
newCmd.AddRange(Cmd);
newCmd.Add(check);
return newCmd.ToArray();
}
#endregion
#region CRC16查表法
#region CRC对应表
//高位表
readonly static byte[] CRCHigh = new byte[]{
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};
//低位表
readonly static byte[] CRCLow = new byte[]{
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};
#endregion
/// <summary>
/// 计算CRC16循环校验码
/// </summary>
/// <param name="Cmd">命令数组</param>
/// <param name="IsHighBefore">高位是否在前</param>
/// <returns>高低位校验码</returns>
public static byte[] GetCRC16(byte[] Cmd, bool IsHighBefore)
{
int index;
int crc_Low = 0xFF;
int crc_High = 0xFF;
for (int i = 0; i < Cmd.Length; i++)
{
index = crc_High ^ (char)Cmd[i];
crc_High = crc_Low ^ CRCHigh[index];
crc_Low = (byte)CRCLow[index];
}
if (IsHighBefore == true)
{
return new byte[2] { (byte)crc_High, (byte)crc_Low };
}
else
{
return new byte[2] { (byte)crc_Low, (byte)crc_High };
}
}
/// <summary>
/// 计算CRC16循环校验码（返回包含校验码的完整命令数组）
/// </summary>
/// <param name="Cmd">命令数组</param>
/// <param name="IsHighBefore">高位是否在前</param>
/// <returns></returns>
public static byte[] GetCRC16Full(byte[] Cmd, bool IsHighBefore)
{
byte[] check = GetCRC16(Cmd, IsHighBefore);
List<byte> newCmd = new List<byte>();
newCmd.AddRange(Cmd);
newCmd.AddRange(check);
return newCmd.ToArray();
}
#endregion
#region 多项式参数 CRC16计算
/// <summary>
/// 多项式参数 CRC16计算
/// </summary>
/// <param name="Cmd">命令</param>
/// <param name="Poly">多项式</param>
/// <param name="IsHighBefore">高位是否在前</param>
/// <returns></returns>
public static byte[] GetCRC16ByPoly(byte[] Cmd, ushort Poly, bool IsHighBefore)
{
byte[] CRC = new byte[2];
ushort CRCValue = 0xFFFF;
for (int i = 0; i < Cmd.Length; i++)
{
CRCValue = (ushort)(CRCValue ^ Cmd[i]);
for (int j = 0; j < 8; j++)
{
if ((CRCValue & 0x0001) != 0)
{
CRCValue = (ushort)((CRCValue >> 1) ^ Poly);
}
else
{
CRCValue = (ushort)(CRCValue >> 1);
}
}
}
byte[] Check = BitConverter.GetBytes(CRCValue);
if (IsHighBefore == true)
{
return new byte[2] { Check[1], Check[0] };
}
else
{
return Check;
}
}
/// <summary>
/// 多项式参数 CRC16计算
/// </summary>
/// <param name="Cmd">命令</param>
/// <param name="Poly">多项式</param>
/// <param name="IsHighBefore">高位是否在前</param>
/// <returns></returns>
public static byte[] GetCRC16ByPolyFull(byte[] Cmd, ushort Poly, bool IsHighBefore)
{
byte[] check = GetCRC16ByPoly(Cmd, Poly, IsHighBefore);
List<byte> newCmd = new List<byte>();
newCmd.AddRange(Cmd);
newCmd.AddRange(check);
return newCmd.ToArray();
}
#endregion
}简单使用
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byte b = BytesCheck.GetXOR(System.Text.Encoding.Default.GetBytes(s));
结果为10进制，转换为十六进制
复制
String xor = b.ToString("X2");
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