Practical Data Communications & Networking for Engineers & Technicians
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The document provides an overview of data communications technology, covering historical developments, communication protocols, and the OSI model. It discusses various standards, such as RS-232 and RS-485, modern instrumentation systems including PLCs, and the structure of information frames in data transmission. Additionally, it highlights the evolution of smart instrumentation and emphasizes the importance of effective communication in technology training.
Practical Data Communications & Networking for Engineers & Technicians
- 1. Technology Training that Workswww.idc-online.com/slideshare Overview of Data Communications
- 2. Technology Training that Workswww.idc-online.com/slideshare Topics Introduction Historical Standards OSI Protocols Physical Standards Modern Instrumentation & Control
- 3. Technology Training that Workswww.idc-online.com/slideshare Introduction Transfer of Information From One Point to Another Transmitter/Receiver/Link Serial Links vs Parallel Links Digital Data vs Analog Mutual Agreement
- 4. Technology Training that Workswww.idc-online.com/slideshare Telegraph System Used Morse Code Plus and Minus Voltages CSMA/CD (Carrier Sense Multiple Access with Collision Detection) Acknowledgement that the Message was Received
- 5. Technology Training that Workswww.idc-online.com/slideshare Historical Background Teletypes Needed Baudot Code Equal Number of Bits for All Characters Hardware Control Using Break Character Positive Voltage Held Longer than One Character Baud Rate defined as the possible number of changes in state per second
- 6. Technology Training that Workswww.idc-online.com/slideshare OSI Model Developed by the ISO Universal Framework for Building A Communications Systems 7 Layer Model 3 Layer Model Very Common for Industry Missing the 8th Layer
- 7. Technology Training that Workswww.idc-online.com/slideshare Standards Within A Communications System Code - Morse - Hex - ASCII Physical - 232 - 422 - 485 Protocol - Modbus, Profibus, Hart, Foundation Fieldbus, Ethernet Open Systems Interconnection Model
- 8. Technology Training that Workswww.idc-online.com/slideshare Common Codes Hex - Used for “Number” Protocols Only Has 0-9 and A-F Characters Limited but Very Efficient ASCII - Used in Most New Protocols Has All the Letters, Number and Punctuation High Overhead but Very Versatile
- 9. Technology Training that Workswww.idc-online.com/slideshare Representation of the OSI Model
- 10. Technology Training that Workswww.idc-online.com/slideshare Protocols Rules for Transmission of Data (Packets) Packet Can Include: Sync Byte Destination Address Source Address Data Error Detection Modbus - Profibus - Canbus - Ethernet - TCP/IP HDLC - DH+ - HART - DNP3 - Interbus - FTP
- 11. Technology Training that Workswww.idc-online.com/slideshare Basic Structure of an Information Frame Defined Sync Byte Destination Address Source Address Data to be Transmitted Error Detection Byte SYNCHRONIZING BYTE Is Used To Synchronize The Receiver. DESTINATION ADDRESS Is Where The Packet Is Going. SOURCE ADDRESS Is Where The Packet Has Coming From. DATA Is The Information Contained In The Packet. ERROR BYTE Is The Result Of The Error Correction Calculation.
- 12. Technology Training that Workswww.idc-online.com/slideshare A Typical Serial Data Communications Link RS-232 RS-232 Terminal Modem Transmitted Data Received DataAnalog Signal Modem Communication Link Terminal DTE DCEDCE DTE • DTE = Data Terminal Equipment • DCE = Data Communication Equipment
- 13. Technology Training that Workswww.idc-online.com/slideshare Voltage Standards EIA/RS-232 Interface Standard Half / Full Duplex - Point to Point EIA/RS-422 Interface Standard Full Duplex - Point to Point EIA/RS-485 Interface Standard Half Duplex - Multidrop
- 14. Technology Training that Workswww.idc-online.com/slideshare Modern Instrumentation Distributed Control System (DCS) All Electronic Programmable Logic Controller (PLC) Came from Relay Equipment Smart Instrumentation Intelligent Electronic Devices ( IED ) Super Smart Sensors
- 15. Technology Training that Workswww.idc-online.com/slideshare Distributed Control System Based Around a Data Highway Modular Distributed & Integrated Each Module Performs Specific Dedicated Task “Good” on Analog Control Easy Connection to PLC’s / supervisory Computer Interfaces
- 16. Technology Training that Workswww.idc-online.com/slideshare PLC Programmable Logic Controller Sequence Control and Interlocking On/Off Inputs/outputs Ladderlogic Type Programs
- 17. Technology Training that Workswww.idc-online.com/slideshare A Typical PLC System
- 18. Technology Training that Workswww.idc-online.com/slideshare Smart Instrumentation Microprocessor Based Instrument Embedded Controllers Data Communications Capability RS- 232, RS 485 or Fiber Optic Ability to Multi-drop With Other Instruments on Same Highway Wave of the Future...Eg Fieldbus
- 19. Technology Training that Workswww.idc-online.com/slideshare Graphical Representation of A Complete System Top Layer is Ethernet Lower Level is RS-485 Data Highway Network, RS-232 and Fiber Optic DCS Data Highway Interconnects Using a Gateway (See Figure 1.5 Page 13)
- 20. Technology Training that Workswww.idc-online.com/slideshare DO YOU WANT TO KNOW MORE? If you are interested in further training or information, please visit: http://idc-online.com/slideshare