用打印口直接供电的数据采集系统设计

Design of Data Acquisition System Using Parallel Port as Direct Power Supply and Data Communication Interface

这里介绍一种利用打印口进行数据传输并直接对外部数据采集系统直接供电的方案。通过对各种打印口的供电能力的分析，为合理设计提供了依据。最后给出了一种利用此原理而设计的进行温度测量的电路。

Here an idea is offered for powering the linked device with parallel port by data lines Detailed analyses on port's powering ability are available; an example of using this strategy, which can be used for temperature measurement is also introduced