By Kevin James
A useful advisor to programming for information acquisition and size - must-have details in precisely the correct quantity of intensity for engineers who're now not programming specialists.
This booklet bargains an entire consultant to the programming and interfacing recommendations excited about info assortment and the next dimension and regulate structures utilizing an IBM appropriate computing device. it really is an important advisor for digital engineers and technicians excited by size and instrumentation, DA&C programmers and scholars aiming to realize a operating wisdom of the economic functions of laptop interfacing.
A easy operating wisdom of programming in a high-level language is thought, yet analytical arithmetic is stored to a minimal. pattern listings are given in C and will be downloaded from the Newnes website.
- Practical information on PC-based acquisition
- Written for digital engineers and software program engineers in undefined, no longer teachers or machine scientists
- A textbook with robust foundations in industry
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Extra resources for PC Interfacing and Data Acquisition: Techniques for Measurement, Instrumentation and Control.
You should always attempt to identify any non-re-entrant library functions that you use and take appropriate precautions to avoid the problems outlined above. A similar consideration applies when accessing any system resource (including hardware registers or operating system or BIOS data) which may be used by the main program and/or by one or more interrupt handlers. 38 PC interfacing and data acquisition Interrupt latencies This consideration is more problematic in real-time systems. The processor may not always respond immediately to an interrupt request.
The PC also facilitates processor-independent high speed I/O using techniques known as Direct Memory Access (DMA) and bus mastering. g. data-logging units, sensors, relays and timers) via suitable adaptor cards. Indeed, adaptor cards for RS-232 ports and Centronics parallel ports, which can be used to interface to certain types of DA&C hardware, are an integral component of almost all PCs. Interfacing, data transfer and DMA are discussed in more detail in Chapters 3, 6, 7 and 8. 34 PC interfacing and data acquisition Requirement 5: ability to model real-world processes It should also be apparent to the reader that the logical structure of a real-time DA&C system should adequately mirror the processes that are being monitored.
The usual way to achieve a consistent and timely response is to use interrupts. Interrupts Interrupts are the means by which the system timer, the keyboard and other PC peripherals request the processor’s attention. When service is required, the peripheral generates an interrupt request signal on one of the expansion bus lines. The processor responds, as soon as possible, by temporarily suspending execution of the current program and then jumping to a predefined software routine. The routine performs whatever action is necessary to fulfil the request and then returns control to the original program, which resumes execution from the point at which it was interrupted.
PC Interfacing and Data Acquisition: Techniques for Measurement, Instrumentation and Control. by Kevin James