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/// <summary>
/// 信息头
/// </summary>
[Serializable]
[StructLayoutAttribute(LayoutKind.Sequential,CharSet.Ansi,Pack=1)]
public struct MessageHead
{
/// <summary>
/// 功能码枚举
/// </summary>
[System.Runtime.InteropServices.MarshalAs(UnmanagedType.U1,SizeConst=1)]
public byte OperationCode;
/// <summary>
/// 数据类型
/// </summary>
[System.Runtime.InteropServices.MarshalAs(UnmanagedType.U1,SizeConst=1)]
public byte DataType;
/// <summary>
/// 帧ID号
/// </summary>
[System.Runtime.InteropServices.MarshalAs(UnmanagedType.U2,SizeConst=2)]
public ushort FrameID;
/// <summary>
/// 保留(存储返回结果)
/// </summary>
[System.Runtime.InteropServices.MarshalAs(UnmanagedType.U1,SizeConst=1)]
public byte Retain;
/// <summary>
/// 数据长度
/// </summary>
[System.Runtime.InteropServices.MarshalAs(UnmanagedType.U4,SizeConst=4)]
public uint DataLength;
}