/// <summary>
/// 读保持寄存器03
/// </summary>
/// <param name="timeout">数据读取延迟</param>
/// <param name="slaveAddress">设备从站地址</param>
/// <param name="startAddress">数据起始地址</param>
/// <param name="regCountIn">寄存器数量</param>
/// <param name="holdRegs"
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