esp8266 Modbus example callback procedure get value

Question

I am trying get register value from Modbus slave machine. I use esp8266 and modbus-esp8266 library with Arduino IDE.

My Slave Machine register address: 40001 40002 40003 40004 40005 40006 40007 40008 40009 40010 40011 40012 40013 40014 40015 40016

I need read 03 READ HOLDIG REGISTER . I use this example here: How can i get register value in this procedure

bool cbWrite(Modbus::ResultCode event, uint16_t transactionId, void* data) 

This example reads multiple address but i dont know how i can use it please give me sample for me. how can i move to to integer variable?

This is example I use:

ModbusRTU ESP8266/ESP32



Read multiple coils from slave device example
  (c)2019 Alexander Emelianov (a.m.emelianov@gmail.com)
  https://github.com/emelianov/modbus-esp8266
  modified 13 May 2020
  by brainelectronics
  This code is licensed under the BSD New License. See LICENSE.txt for more info.




#include <ModbusRTU.h>
 #if defined(ESP8266)
 #include <SoftwareSerial.h>
 // SoftwareSerial S(D1, D2, false, 256);

 // receivePin, transmitPin, inverse_logic, bufSize, isrBufSize
 // connect RX to D2 (GPIO4, Arduino pin 4), TX to D1 (GPIO5, Arduino pin 4)
 SoftwareSerial S(4, 5);
#endif

ModbusRTU mb;

bool cbWrite(Modbus::ResultCode event, uint16_t transactionId, void* data) {
#ifdef ESP8266
  Serial.printf_P("Request result: 0x%02X, Mem: %d
", event, ESP.getFreeHeap());
#elif ESP32
  Serial.printf_P("Request result: 0x%02X, Mem: %d
", event, ESP.getFreeHeap());
#else
  Serial.print("Request result: 0x");
  Serial.print(event, HEX);
#endif
  return true;
}

void setup() {
  Serial.begin(115200);
 #if defined(ESP8266)
  S.begin(9600, SWSERIAL_8N1);
  mb.begin(&S);
 #elif defined(ESP32)
  Serial1.begin(9600, SERIAL_8N1);
  mb.begin(&Serial1);
 #else
  Serial1.begin(9600, SERIAL_8N1);
  mb.begin(&Serial1);
  mb.setBaudrate(9600);
 #endif
  mb.master();
}

bool coils[20];

void loop() {
  if (!mb.slave()) {
    mb.readCoil(1, 1, coils, 20, cbWrite);
  }
  mb.task();
  yield();
}

Example address is :Link

question from:https://stackoverflow.com/questions/66050167/esp8266-modbus-example-callback-procedure-get-value

Answer 1

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