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PC Based Instrumentation and Control, 3rd Edition by Mike Tooley

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9 Interfacing

This chapter aims to introduce readers to the general principles of interfacing sensors and transducers to PC bus I/O cards. We shall describe a variety of common sensors and transducers and, for those who do not wish to make use of ‘off-the-shelf’ signal conditioning modules, details of the circuitry necessary to interface such devices to several commonly available I/O cards has been provided. Before embarking on this task, it is perhaps worth mentioning some of the more important characteristics and limitations of conventional digital and analogue digital I/O ports.

Characteristics of digital I/O ports

The digital I/O ports provided by most PC expansion cards are invariably byte wide (i.e. each port comprises eight individual ...

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