The traditional name for a series of standards for serial binary single-ended data and control signals connecting between a DTE (Data Terminal Equipment) and a DCE (Data Circuit-terminating Equipment). It is commonly used in computer serial ports.
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A digital computer used for control of machinery on factory assembly lines, amusement rides or light fixtures. PLCs are used in many industries and machines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact.
A system in which analog and/or digital inputs and outputs are connected to a host computer via some type of Ethernet link. The host computer then accepts data from the inputs and sends out data, which controls the outputs.