In general, designers of industrial control and data acquisition applications based on the PC use plug‐in cards to introduce signals from transducers into the computer system. This solution presents three major difficulties. First, each transducer must be individually wired into the computer, involving a complicated and costly cabling task. Secondly, the distance from transducer to computer is restricted by the level of noise pick‐up which can be tolerated. And, thirdly, the PC's microprocessor carries the full burden of processing for the entire system.
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