| 摘要 |
The invention relates to an analogue-digital and digital-analogue interface for microcomputers and microprocessor systems, whose input gain is easily manually adjustable. The rapid rate of the measurements or of the outputs is automatically obtained by hard-wired control logic which takes advantage of the input-output instructions from the Z80 Zilog microprocessor. The inputs are protected against overvoltages and mains voltages, as well as the analogue-digital converter. The interface is particularly intended for measuring and memory storing rapidly-varying electrical voltages, and for the transformation, by calculation, either in real time or off-line, of these input signals. The result may be available in the form of analogue signals on the outputs. <IMAGE>
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