仪器通过USB接口与上位机通信；
The instrument communicated with master computer through USB interface.
处理后的数据通过单片机与上位机通信以实现数据的离线分析。
The processed data can be communicated with a PC to realize off-line data analysis.
详细分析了硬件的组成、软件控制流程、系统的扩展和PLC与上位机通信的实现方法。
The hardware composition, software control flowchart, system expansion, and the communication between host computer and PLCs are analyzed in detail.
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