针对当前人机界面软件（HMI）需要精确显示天平称重结果的需求，提出了一种利用电脑串行口（COM口）与梅特勒托利多天平通讯，从而精确读取称重结果的方法。分析了传统I/O通道读取称重结果的缺点，介绍了使用COM口读取梅特勒托利多天平称重结果的具体实现步骤。通过实践证明，这种方法可以在不需要模拟量输入模块的情况下精确地读取相应天平的称重结果，在自控领域有着广阔的应用前景和推广价值。%In order to meet the requirements of high display accuracy for human-computer interface(HMI) software, a new method that can get the weighing results accurately by communicate with the METTLER TOLEDO devices using PC COM ports is introduced accordingly. This paper analyzes the shortcoming of traditional communicate method using I/O channels, introduces the concrete implementation steps of the new method. The practice proved that by using the new method, we can read the weighing results accurately without any analog input module and shows that it has broad prospect of application and popularization in automation field.
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