Your system does not have any communication ports installed or the device driver for the communication port is not started.
系统未安装任何通讯端口，或通讯端口的设备驱动程序未启动。
Reconfirm of the setting of the communication port of the PC, the communications cable, and the setting of the boot mode of PCE-210.
再次确认设置，包括电脑的通信端口，连接线，PCE-210设置的启动模式。
By reading the communication port, the management software in the upper computer records the data real-timely and handles the corresponding situation.
上位机的管理软件通过对串口的读取，将用户端的实时信息进行录入，并针对相应情况做出处理。
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