This paper introduces the design of a data acquisition and detection circuit based on PC104, which completes the functions of A/D data acquisition, D/A digital/analog conversion, digital input/output, signal display card and LCD display control. The PC104 bus signal detection circuit is of great significance for improving the equipment fault detection method. Through the analysis of the signal waveform display principle and display method, the specific practical scheme is determined and the design of the functional circuit is completed; the interface protocol and logic control circuit of the PC104 bus are realized by combining the dedicated interface chip with CPLD; the detection system circuit can work stably in the actual test process and meet the design index requirements.
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