With the development of electronic computer technology and its increasingly widespread application, data acquisition and communication have become one of the key technologies in many test systems. The so-called data acquisition process is the process of collecting, transmitting and processing information. In the process of completing a crystal oscillator test system for a certain unit\'s scientific research project, we conducted an experimental study on computer data acquisition and communication technology. This article focuses on the communication between the microcontroller lower computer and the upper computer, mainly transmitting current signals, temperature control signals and voltage control signals.
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