Rs 485 communication protocol pdf

Rs 485 communication protocol pdf

Rating: 4.4 / 5 (3080 votes)

Downloads: 21108

CLICK HERE TO DOWNLOAD

.

.

.

.

.

.

.

.

.

.

This article focuses on the RS (EIA/TIA) protocol and the applications best suited to that standard Freebournes Road, Witham, Essex, CMAH, UK Tel: +Fax: +The Information contained in this guide is for use only by installers trained to make electrical power & communications installations and is intended to describe the commuications function of the products covered. solutions. communication. This section includes information on connections and topologies, two and four-wire systems, termination and biasing issues and solutions, and the application of repeatersIN THIS CHAPTER monitoring using a serial communication protocol based on the RS standard. RS offers several advantages, making it a popular choice for communication in various industrial and commercial serial communication. The RS standard only specifies the electrical characteristics of drivers and receivers; it does not specify a protocol RS is a serial communication protocol. This technical note covers some of the design requirements for creating a successful network including wiring, shielding, polarity, terminations (End of Line), biasing, unit load (UL), data rates, network lengths and topology. Though each protocol suits a particular application, in all cases you must consider cost and performance of the physical (PHY) layer. Many higher RS conveys data differentially over a terminated twisted pair,and does not specify any data protocol or connectors. Figure provides an exampleV < VOD Refer to [Selecting communication protocol] 1Communication function 2 Data Link MODBUS Serial Line ProtocolPhysical EIA/TIA (or EIA/TIA) FigureMODBUS Protocols and ISO/OSI Model MODBUS application layer messaging RS—the most common and easy-to-use communication interface The Basics of RS// Start bitbit Data bits, 6, 7, orbitsThe RS and RS which defines the communication protocol for electronic energy-meters in China, specifying RS as the physical layer standard. Key features of RS are: Balanced interface Multipoint operation from a singleV supply –7-V to +V bus common-mode range Up tounit loads Mbps maximum data rate (atfeet) Ω for each transistor.