gistfile1.cs

public override byte[] Create()
{
    var stream = new MemoryStream();
    using (var writer = new BinaryWriter(stream))
    {
        writer.Write(CommunicationAddress);
        writer.Write(CommandId);

        unchecked
        {
            writer.Write((byte)(CommunicationPassword >> 8));
            writer.Write((byte)(CommunicationPassword));

            writer.Write((byte)(registerId >> 8));
            writer.Write((byte)(registerId));
        }

        writer.Write(registerUnit);
        writer.Write(sizeof(byte));
        writer.Write(signAndExponent);
        writer.Write(registerValue);
    }

    return CreatePhysicalLayerFrame(stream.ToArray().AddCRC());
}