Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario Pagina 330

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Preface
MicroLogix 1000 Programmable Controllers User Manual
D–2
RS-232 Communication Interface
RS-232 is an Electronics Industries Association (EIA) standard that specifies the
electrical, mechanical, and functional characteristics for serial binary
communication. It provides you with a variety of system configuration possibilities.
(RS-232 is a definition of electrical characteristics; it is not a protocol.)
One of the biggest benefits of the RS-232 interface is that it lets you integrate
telephone and radio modems into your control system (using the appropriate DF1
protocol only; not DH-485 protocol). The distance over which you are able to
communicate with certain system devices is virtually limitless.
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