MODBUS Protocol for Arduino
问题描述：
我有SCADA系统和两个arduino奴隶。 scada系统适用于Modbus协议。数据必须通过modbus协议从SLAVES发送到SCADA系统。让我知道如何在Arduino平台上实现modbus协议。在这里如何沟通。请分享arduino UNO modbus协议的接线图。MODBUS Protocol for Arduino
#include "Wire.h"
#define DS1307_ADDRESS 0x68
byte zero = 0x00; //workaround for issue #527
void setup(){
Wire.begin();
Serial.begin(9600);
setDateTime(); //MUST CONFIGURE IN FUNCTION
}
void loop(){
printDate();
delay(1000);
}
void setDateTime(){
byte second = 45; //0-59
byte minute =01; //0-59
byte hour = 13; //0-23
byte weekDay =2; //1-7
byte monthDay =24; //1-31
byte month = 2; //1-12
byte year = 14; //0-99
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero); //stop Oscillator
Wire.write(decToBcd(second));
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
Wire.write(decToBcd(weekDay));
Wire.write(decToBcd(monthDay));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.write(zero); //start
Wire.endTransmission();
}
byte decToBcd(byte val){
// Convert normal decimal numbers to binary coded decimal
return ((val/10*16) + (val%10));
}
byte bcdToDec(byte val) {
// Convert binary coded decimal to normal decimal numbers
return ((val/16*10) + (val%16));
}
void printDate(){
// Reset the register pointer
Wire.beginTransmission(DS1307_ADDRESS);
Wire.write(zero);
Wire.endTransmission();
Wire.requestFrom(DS1307_ADDRESS, 7);
int second = bcdToDec(Wire.read());
int minute = bcdToDec(Wire.read());
int hour = bcdToDec(Wire.read() & 0b111111); //24 hour time
int weekDay = bcdToDec(Wire.read()); //0-6 -> sunday - Saturday
int monthDay = bcdToDec(Wire.read());
int month = bcdToDec(Wire.read());
int year = bcdToDec(Wire.read());
/* int second = 11;
int minute =18;
int hour = 18;
int weekDay = 1;
int monthDay = 2;
int month = 11;
int year = 12;
*/
//print the date EG 3/1/11 23:59:59
Serial.print(monthDay);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.print(year);
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
Serial.println(second);
// Serial.print("Week Day Of week");
// Serial.println(weekDay);
}
数据通过MODBUS协议来发送：
Serial.print(year);
Serial.print(month);
Serial.print(monthDay);
Serial.print(hour);
Serial.print(minute);
Serial.println(second);
我期待例如与Arduino的
答
不知道你寻找什么对于。你可以进入SourceForge并找到任意数量的Arduino兼容库。
如果您正在寻找更像完整草图的东西，这是一个完整的草图。它是j2mod的一部分，它是一个Java Modbus实现。
https://sourceforge.net/p/j2mod/code/HEAD/tree/trunk/src/sketches/OSS_DAQ/OSS_DAQ.ino
答
你需要编写或找到Arduino的MODBUS通信协议栈（库）。如何使用它的说明应该是该库的一部分。
注意：Modbus是可以使用不同“物理层”的通信协议。 RS-485，其中一些可能不被Arduino支持。
更多MODBUS： https://en.wikipedia.org/wiki/Modbus 更多的RS-485： https://en.wikipedia.org/wiki/RS-485