C sharp - traducir tramas modbus

private byte[] ReadInputRegistersMsg(byte slaveAddress, ushort startAddress, byte function, uint numberOfPoints)

{

    byte[] frame = new byte[8];

    frame[0] = slaveAddress;			    // Slave Address

    frame[1] = function;				    // Function             

    frame[2] = (byte)(startAddress >> 8);	// Starting Address High

    frame[3] = (byte)startAddress;		    // Starting Address Low            

    frame[4] = (byte)(numberOfPoints >> 8);	// Quantity of Registers High

    frame[5] = (byte)numberOfPoints;		// Quantity of Registers Low

    byte[] crc = this.CalculateCRC(frame);  // Calculate CRC.

    frame[frame.Length - 2] = crc[0];       // Error Check Low

    frame[frame.Length - 1] = crc[1];       // Error Check High

    return frame;

}

/// <summary>

/// CRC Calculation 

/// </summary>

/// <param name="data"></param>

/// <returns></returns>

private byte[] CalculateCRC(byte[] data)

{

    ushort CRCFull = 0xFFFF; // Set the 16-bit register (CRC register) = FFFFH.

    byte CRCHigh = 0xFF, CRCLow = 0xFF;

    char CRCLSB;

    byte[] CRC = new byte[2];

    for (int i = 0; i < (data.Length) - 2; i++)

    {

        CRCFull = (ushort)(CRCFull ^ data[i]); // 

        for (int j = 0; j < 16; j++)

        {

            CRCLSB = (char)(CRCFull & 0x00000001);

            CRCFull = (ushort)((CRCFull >> 1) & 32767);

            if (CRCLSB == 1)

                CRCFull = (ushort)(CRCFull ^ 0x1021);

        }

    }

    CRC[1] = CRCHigh = (byte)((CRCFull >> 8) & 0xFFFF);

    CRC[0] = CRCLow = (byte)(CRCFull & 0xFFFF);

    return CRC;

}