Modbus Implementation PC to Industrial Devices

Presented by
D.PRADHYUMNA (06M91A0426)
C.MEHAR PRASAD (06M91A0421)
INTERNAL GUIDE: Ms. REKHA
EXTERNAL GUIDE: Mr.MAHESH PATIL


Introduction
Modbus communication interface for a multidrop network based on a master/client architecture.
It moniters and program devices to communicate between intelligent devices and sensors and instruments,to monitor the field devices using PCs and HMIs.
Modbus protocol defines a message structure,how pc address a ....etc

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hi am sanjay jadhav  i want  source code or header file of modbus protocol and lpc2148 ....etc

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I am using UART for communicating 8 modules having LPC2148 microcontroller as a slave with another module having LPC2148 as master.But I am finding a constraint of wire length(I have read some articles on net which suggest a wire length of 2.6 mtrs for a baudrate of 56000bps) Can I replace this with MODBUS communication ?If yes where can I get information about modbus? ....etc

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we are implementing modbus protocol between pc and controller c8051f340 can u tell what are requirements needed? ....etc

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#include

#include

#define METERSLAVEID 11

#define LEDPIN 13

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Create a software interface for meter (create a ModBusMaster node)

ModbusMaster node(METERSLAVEID);

void setup() {

// Initialising communication with meter

node.begin(9600);



// Setting up led

pinMode(LEDPIN, OUTPUT);



// set up the LCD's number of columns and rows:

lcd.begin(16, 2);



// Print a message to th ....etc

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