然后，介绍了上位机软件设计以及上位机与温度记录仪之间的通信协议设计。
And then, the design of software in PC and communication protocol between PC and temperature logger are introduced.
介绍了伦茨变频器通过LECOM协议与上位机通信的方法。给出了LECOM通信的硬件构成、通信协议以及程序设计方法。
A method of LECOM communication of LENZE inverter to the host is described, and the hardware composition, communication protocol and programming design method are also presented.
给出了以89s52为主控芯片的下位机系统的软硬件设计，并给出了上位机操作软件和与下位机的通信协议。
The software and hardware design of the substrate control system which USES 89s52 as the main control chip, the PC's operating software and the communication protocols are given in this paper.
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