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C# 工业级 CRC16 校验完整实现（Modbus RTU 标准版）

news 2026/5/11 22:20:23

C# 工业级 CRC16 校验完整实现（Modbus RTU 标准版）

以下是工控上位机中最常用、最可靠的CRC16-Modbus实现（表驱动法，性能最高），支持 byte[] 和 Span，直接复制即可使用。

1. CRC16 计算工具类（推荐）

publicstaticclassCrc16{privatestaticreadonlyushort[]CrcTable=newushort[256]{0x0000,0xC0C1,0xC181,0x0140,0xC301,0x03C0,0x0280,0xC241,0xC601,0x06C0,0x0780,0xC741,0x0500,0xC5C1,0xC481,0x0440,0xCC01,0x0CC0,0x0D80,0xCD41,0x0F00,0xCFC1,0xCE81,0x0E40,0x0A00,0xCAC1,0xCB81,0x0B40,0xC901,0x09C0,0x0880,0xC841,0xD801,0x18C0,0x1980,0xD941,0x1B00,0xDBC1,0xDA81,0x1A40,0x1E00,0xDEC1,0xDF81,0x1F40,0xDD01,0x1DC0,0x1C80,0xDC41,0x1400,0xD4C1,0xD581,0x1540,0xD701,0x17C0,0x1680,0xD641,0xD201,0x12C0,0x1380,0xD341,0x1100,0xD1C1,0xD081,0x1040,0xF001,0x30C0,0x3180,0xF141,0x3300,0xF3C1,0xF281,0x3240,0x3600,0xF6C1,0xF781,0x3740,0xF501,0x35C0,0x3480,0xF441,0x3C00,0xFCC1,0xFD81,0x3D40,0xFF01,0x3FC0,0x3E80,0xFE41,0xFA01,0x3AC0,0x3B80,0xFB41,0x3900,0xF9C1,0xF881,0x3840,0x2800,0xE8C1,0xE981,0x2940,0xEB01,0x2BC0,0x2A80,0xEA41,0xEE01,0x2EC0,0x2F80,0xEF41,0x2D00,0xEDC1,0xEC81,0x2C40,0xE401,0x24C0,0x2580,0xE541,0x2700,0xE7C1,0xE681,0x2640,0x2200,0xE2C1,0xE381,0x2340,0xE101,0x21C0,0x2080,0xE041,0xA001,0x60C0,0x6180,0xA141,0x6300,0xA3C1,0xA281,0x6240,0x6600,0xA6C1,0xA781,0x6740,0xA501,0x65C0,0x6480,0xA441,0x6C00,0xACC1,0xAD81,0x6D40,0xAF01,0x6FC0,0x6E80,0xAE41,0xAA01,0x6AC0,0x6B80,0xAB41,0x6900,0xA9C1,0xA881,0x6840,0x7800,0xB8C1,0xB981,0x7940,0xBB01,0x7BC0,0x7A80,0xBA41,0xBE01,0x7EC0,0x7F80,0xBF41,0x7D00,0xBDC1,0xBC81,0x7C40,0xB401,0x74C0,0x7580,0xB541,0x7700,0xB7C1,0xB681,0x7640,0x7200,0xB2C1,0xB381,0x7340,0xB101,0x71C0,0x7080,0xB041,0x5000,0x90C1,0x9181,0x5140,0x9301,0x53C0,0x5280,0x9241,0x9601,0x56C0,0x5780,0x9741,0x5500,0x95C1,0x9481,0x5440,0x9C01,0x5CC0,0x5D80,0x9D41,0x5F00,0x9FC1,0x9E81,0x5E40,0x5A00,0x9AC1,0x9B81,0x5B40,0x9901,0x59C0,0x5880,0x9841,0x8801,0x48C0,0x4980,0x8941,0x4B00,0x8BC1,0x8A81,0x4A40,0x4E00,0x8EC1,0x8F81,0x4F40,0x8D01,0x4DC0,0x4C80,0x8C41,0x4400,0x84C1,0x8581,0x4540,0x8701,0x47C0,0x4680,0x8641,0x8201,0x42C0,0x4380,0x8341,0x4100,0x81C1,0x8081,0x4040};/// <summary>/// 计算 CRC16-Modbus（标准版）/// </summary>publicstaticushortCompute(ReadOnlySpan<byte>data){ushortcrc=0xFFFF;foreach(bytebindata){crc=(ushort)((crc>>8)^CrcTable[(crc^b)&0xFF]);}returncrc;}/// <summary>/// 计算并附加 CRC16（返回完整帧）/// </summary>publicstaticbyte[]AppendCrc(byte[]data){ushortcrc=Compute(data);byte[]result=newbyte[data.Length+2];Array.Copy(data,result,data.Length);result[^2]=(byte)(crc&0xFF);// 低字节在前result[^1]=(byte)(crc>>8);returnresult;}/// <summary>/// 验证接收帧的 CRC 是否正确/// </summary>publicstaticboolVerify(ReadOnlySpan<byte>frame){if(frame.Length<3)returnfalse;ushortcalculated=Compute(frame[..^2]);ushortreceived=(ushort)((frame[^1]<<8)|frame[^2]);returncalculated==received;}}

2. 使用示例（Modbus RTU 发送与验证）

// 示例：读保持寄存器（功能码 03）byte[]request={0x01,0x03,0x00,0x00,0x00,0x02};// 地址 1，读 2 个寄存器byte[]frame=Crc16.AppendCrc(request);// 发送serialPort.Write(frame,0,frame.Length);// 接收后验证byte[]response=newbyte[9];// 假设返回 9 字节serialPort.Read(response,0,9);if(Crc16.Verify(response)){// CRC 正确，继续解析数据ushortvalue=(ushort)((response[3]<<8)|response[4]);}else{// CRC 错误，丢弃或重发Console.WriteLine("CRC 校验失败");}