底层网络包的数据或消息区域封装了一个请求命令，它请求设备中包含设备信号数据的寄存器的内容。
A request command is enclosed in the data or message section of the underlying network packet. It requests the contents of registers in the device containing signal data of a device.
将实时数据、空间拓扑数据、设备属性数据以及对这些数据操作的函数封装为空间实体类，建立了空间实体对象。
The realtime datum, spatial topological datum, datum of facility property, and the function of operating the datum are enveloped in class of spatial entity, and then set up object of spatial entity.
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