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PREPARED BY-

ANAND ARPIT(806152)

GAURAV SHARMA(806162)

MULANI SAGAR(806188)

PADODARA CHINTAN(806191)

PROJECT GUIDE - MR. VISMAY YAGNIK

PROTOCOL COMMUNICATION

AND CONVERSION

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y Protocol is a description of digital message formats and the

rules for exchanging those messages in or between computing

systems and in telecommunications

y Why we need a protocol ??

y Elements of a Protocol

-Syntax

-Semantics

-Timing

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y Basic requirements of protocols

-Data formats for data exchange

-Address formats for data exchange

-Address mapping

-Routing

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MODBUS Protocol Communication

General MODBUS frame:

Data model:

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MODBUS Transaction state diagram

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Benefits of Modbus

1. Openness,no license fees.

2. Widelysupported by SCADA and HMI software

3. Easyto use.4. Easilyintegrate variantdevices

5. Lowdevelopment cost

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Controlling different instruments using MODBUS Protocol

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ARM: CORTEX M-3

y The three distinct profiles ofthe ARMv7 architecture;

y Cortex-M3 processor has an advanced 3-stage pipeline core,

based on the Harvard architecture.

y The central Cortex-M3 core is based on the Harvard

architecture .

y Efficient SRAM utilization is unaligned data access.

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y The Cortex-M3 processor is a 32-bit processor.

y Fixed memory map for up to 4 gigabytes.

y It has 32 interrupts with 8 levels.

y Thumb-2 Instruction Set Architecture (ISA).

y Thumb-2 instructions include a mix of the original 16-bit Thumb

instructions and new 32-bit instructions that provide equivalent

functionality to the 32-Bit ARM instruction set.

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BACnet Protocol Communication

y BACnet Protocol.

y Objects represent physicalinputs, outputs andsoftware processes.

y Objects areevaluated and controlled bytheir properties

y

Property Name,Value

Object Name "Lighting Area 1"

ObjectType BINARY_OUTPUT

PresentValue Active

Status Flags Normal, In-Service

Out Of Service False

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BACnet Architecture

BACnet Architecture

y Layer 1: Physical layer

y Layer 2: Data Link layer

y Layer 3: Network layer

y Layer 4:Application layer

BACnet Services

y Object Access

y Device Managementy Alarm and Event

y File Transfer

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BACnet Frame Format

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Benefits and applications of BACnet

Benefits of BACnet:

y Designed specifically for building control

y Can be implemented in devices of any size

y Can be readily enhanced and improved

y

Not tied to present technologies

Applications:

y HVAC control

y Fire detection and alarm

y Lighting control

y Security

y Smart elevators

y Utility company interface

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Accessing our server using BACnet

Protocol

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PROTOCOL CONVERTERy Whatis a Protocol Converter?

y Whyweneedit?

y Applications?

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Conversion Process

MODBUS BACnet

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Protocol Conversion Practically

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CONCLUSION

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BIBLIOGRAPHY

http://www.arm.com/files/pdf/IntroToCortex-M3.pdf

http://www.bacnet.org/Tutorial/index.html

http://modbus.org/tech.php

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