2510 月
Arduino Modbus 讀取與寫入範例
讀取多個並寫入多個
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#include <ModbusRtu.h> /// oled debuging #include <SPI.h> #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #define OLED_RESET 4 // not used / nicht genutzt bei diesem Display Adafruit_SSD1306 display(OLED_RESET); /// uint16_t au16data[32]; //!< data array for modbus network sharing Array uint8_t u8state; //!< machine state uint8_t u8query; //!< pointer to message query /** * Modbus object declaration * u8id : node id = 0 for master, = 1..247 for slave * u8serno : serial port (use 0 for Serial) * u8txenpin : 0 for RS-232 and USB-FTDI * or any pin number > 1 for RS-485 */ Modbus master(0,0,7); // this is master and RS-232 or USB-FTDI /// 7 = PIN ENEABLE rs485 /** * This is an structe which contains a query to an slave device */ modbus_t telegram[2]; unsigned long u32wait; void setup() { // initialize with the I2C addr 0x3C / mit I2C-Adresse 0x3c initialisieren display.begin(SSD1306_SWITCHCAPVCC, 0x3C); display.display(); delay(2000); display.clearDisplay(); display.setTextSize(0.5); display.setTextColor(INVERSE); ////////////////////////////// // telegram 0: read registers telegram[0].u8id = 1; // slave address telegram[0].u8fct = 3; // function code (registers read multiple 3) telegram[0].u16RegAdd = 0; // start address in slave - direccion de Inicio 0 telegram[0].u16CoilsNo = 10; // number of elements (coils or registers) to read 0 - 16 telegram[0].au16reg = au16data; // pointer to a memory array in the Arduino - Almacenamiento en Array de memoria de arduino // telegram 1: write a multiple register = function 16 telegram[1].u8id = 1; // slave address telegram[1].u8fct = 16; // function code (write multiple registers 16 ) telegram[1].u16RegAdd = 10; // start address in slave - direccion de Inicio 10 telegram[1].u16CoilsNo = 10; // number of elements (coils or registers) to read telegram[1].au16reg = au16data+10; // pointer to a memory array in the Arduino - Almacenamiento en Array de memoria de arduino 10 posiciones despues master.begin( 19200 ); // baud-rate at 19200 master.setTimeOut( 5000 ); // if there is no answer in 5000 ms, roll over u32wait = millis() + 1000; u8state = u8query = 0; } void loop() { switch( u8state ) { case 0: if (millis() > u32wait) u8state++; // wait state break; case 1: master.query( telegram[u8query] ); // send query (only once) u8state++; u8query++; if (u8query > 2) u8query = 0; break; case 2: master.poll(); // check incoming messages if (master.getState() == COM_IDLE) { u8state = 0; u32wait = millis() + 1000; } break; } display.clearDisplay(); //Read Multiple Holding Register - Lectura de multiples registros display.setCursor(0,0); display.print(au16data[0]); // Read Holding Register [0] display.print(","); display.print(au16data[1]); // Read Holding Register [1] display.print(","); display.print(au16data[2]); // Read Holding Register [2] display.print(","); display.print(au16data[3]); // Read Holding Register [3] display.print(","); display.print(au16data[4]); // Read Holding Register [4] display.print(" Hold 0-4"); display.setCursor(0,8); display.print(au16data[5]); // Read Holding Register [5] display.print(","); display.print(au16data[6]); // Read Holding Register [6] display.print(","); display.print(au16data[7]); // Read Holding Register [7] display.print(","); display.print(au16data[8]); // Read Holding Register [8] display.print(","); display.print(au16data[9]); // Read Holding Register [9] display.print(" Hold 5-9"); //Write Multiple Holding Register - Escritura de multiples registros au16data[10] = analogRead( 0 ); // Write Holding Register [10] au16data[11] = analogRead( 0 ); // Write Holding Register [11] au16data[12] = analogRead( 0 ); // Write Holding Register [12] au16data[13] = analogRead( 0 ); // Write Holding Register [13] au16data[14] = analogRead( 0 ); // Write Holding Register [14] au16data[15] = analogRead( 0 ); // Write Holding Register [15] au16data[16] = analogRead( 0 ); // Write Holding Register [16] au16data[17] = analogRead( 0 ); // Write Holding Register [17] au16data[18] = analogRead( 0 ); // Write Holding Register [18] au16data[19] = analogRead( 0 ); // Write Holding Register [19] // Print Oled Write Holding Register display.setCursor(0,16); display.print(au16data[10]); display.print(","); display.print(au16data[11]); display.print(","); display.print(au16data[12]); display.print(","); display.print(au16data[13]); display.print(","); display.print(au16data[14]); display.print(","); display.print(au16data[15]); display.print(","); display.print(au16data[16]); display.print(","); display.print(au16data[17]); display.print(","); display.print(au16data[18]); display.print(","); display.print(au16data[19]); display.print(" Hold 10-19"); display.display(); } |
讀取單個並寫入單個
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/** * Modbus master example 2: * The purpose of this example is to query an array of data * from an external Modbus slave device. * This example is similar to "simple_master", but this example * allows you to use software serial instead of hardware serial * in case that you want to use D1 & D2 for other purposes. * The link media can be USB or RS232. The circuit: * software serial rx(D3) connect to tx pin of another device * software serial tx(D4) connect to rx pin of another device * In this example, we will use two important methods so that we can use * software serial. * * 1. Modbus::Modbus(uint8_t u8id) * This is a constructor for a Master/Slave through USB/RS232C via software serial * This constructor only specifies u8id (node address) and should be only * used if you want to use software serial instead of hardware serial. * This method is called if you create a ModBus object with only on parameter "u8id" * u8id is the node address of the arduino that will be programmed on, * 0 for master and 1..247 for slave * for example: Modbus master(0); * If you use this constructor you have to begin ModBus object by * using "void Modbus::begin(SoftwareSerial *softPort, long u32speed)". * * 2. void Modbus::begin(SoftwareSerial *sPort, long u32speed) * Initialize class object. * This is the method you have to use if you construct the ModBus object by using * Modbus::Modbus(uint8_t u8id) in order to use software serial and to avoid problems. * You have to create a SoftwareSerial object on your own, as shown in the example. * sPort is a pointer to your SoftwareSerial object, u32speed is the baud rate, in * standard increments (300..115200) created long time ago by smarmengol modified 29 July 2016 by Helium6072 This example code is in the public domain. */ #include <ModbusRtu.h> #include <SoftwareSerial.h> uint16_t au16data[16]; //!< data array for modbus network sharing uint8_t u8state; //!< machine state uint8_t u8query; //!< pointer to message query /** * Modbus object declaration * u8id : node id = 0 for master, = 1..247 for slave * u8serno : serial port (use 0 for Serial) * u8txenpin : 0 for RS-232 and USB-FTDI * or any pin number > 1 for RS-485 */ Modbus master(0); // this is master and RS-232 or USB-FTDI via software serial /** * This is an structe which contains a query to an slave device */ modbus_t telegram[2]; unsigned long u32wait; SoftwareSerial mySerial(12, 13);//Create a SoftwareSerial object so that we can use software serial. Search "software serial" on Arduino.cc to find out more details. void setup() { Serial.begin(9600);//use the hardware serial if you want to connect to your computer via usb cable, etc. master.begin( &mySerial, 38400 ); // begin the ModBus object. The first parameter is the address of your SoftwareSerial address. Do not forget the "&". 9600 means baud-rate at 9600 // telegram 0: read registers telegram[0].u8id = 1; // slave address telegram[0].u8fct = 3; // function code (this one is registers read) telegram[0].u16RegAdd = 1; // start address in slave telegram[0].u16CoilsNo = 3; // number of elements (coils or registers) to read telegram[0].au16reg = au16data; // pointer to a memory array in the Arduino // telegram 1: write a single register telegram[1].u8id = 1; // slave address telegram[1].u8fct = 6; // function code (this one is write a single register) telegram[1].u16RegAdd = 6; // start address in slave telegram[1].u16CoilsNo = 1; // number of elements (coils or registers) to read telegram[1].au16reg = au16data+4; // pointer to a memory array in the Arduino master.setTimeOut( 2000 ); // if there is no answer in 5000 ms, roll over u32wait = millis() + 1000; u8state = u8query = 0; } void loop() { switch( u8state ) { case 0: if (millis() > u32wait) u8state++; // wait state break; case 1: master.query( telegram[u8query] ); // send query (only once) u8state++; u8query++; if (u8query > 2) u8query = 0; break; case 2: master.poll(); // check incoming messages if (master.getState() == COM_IDLE) { u8state = 0; u32wait = millis() + 300; Serial.println(au16data[0]); Serial.println(au16data[1]); Serial.println(au16data[2]); } break; } au16data[4] = random(1000); } |