How do I adjust the timing of acquiring Modbus data after sensor operation?

Using Arduino Networking, Protocols, and Devices
#1

  1. The ADS1115 sensor is activated and the result is stored in a variable via a specific operation on eight channels.
    (It takes about 800 ~ 850ms to reach this point. It will work again in 1 second.)

  2. Save the sensor value to MODBUS and wait for the call.

  3. Call MODBUS every 1 second to receive the value.

Problem: After receiving the value only for the first time of the call, after a few seconds, the time out error occurs and the value is not received.

Action: The MODBUS wait time is short as 150 ~ 200ms.
Let the ADS1115 sensor run once every 3 seconds
Increased MODBUS call waiting time to 1 second, but call failed

function timing in oscilloscope :

modbus simulator result : (success 358 / time out error 332)

void setup() {
  /* Serial */

  Serial1.begin(BAUDRATE);    // GPS
  Serial2.begin(BAUDRATE);    // LoRa
  Serial.begin(BAUDRATE);     // monitor
  rtc.begin(DateTime(F(__DATE__), F(__TIME__)));
  slave.cbVector[CB_READ_REGISTERS] = readAnalogIn;
  
  // set Serial and slave at baud 9600.
  slave.begin( BAUDRATE );

  /* Timer */
  Timer1.attachInterrupt(COUNT_1MS).start(1000);                            // every 1ms
  Timer2.attachInterrupt(ADC_CAL_START).start(1000000);                // every 1s
  Timer4.attachInterrupt(SAVE_LORA_BUFFER_AND_SDCARD).start(1000000); // every 1s
  Timer5.attachInterrupt(GPS_INIT).start(3600000000);  every 1 hour

  /* ADC */
  analogReadResolution(12);
  pinMode(SENSOR_00, INPUT);
  pinMode(SENSOR_01, INPUT);
  pinMode(SENSOR_02, INPUT);
  pinMode(SENSOR_03, INPUT);
  pinMode(SENSOR_04, INPUT);
  pinMode(SENSOR_05, INPUT);
  pinMode(SENSOR_06, INPUT);
  pinMode(SENSOR_07, INPUT);


  /* ADS1115 */
  ads1.getAddr_ADS1115(ADS1115_DEFAULT_ADDRESS);   // 0x48, 1001 000 (ADDR = GND)
  ads2.getAddr_ADS1115(ADS1115_VDD_ADDRESS);    // 0x49, 1001 001 (ADDR = VDD)
  ads1.setGain(GAIN_TWO);  // 2/3x gain +/- 6.144V  1 bit = 0.1875mV
  ads2.setGain(GAIN_TWO);
  ads1.setMode(MODE_CONTIN);       // Continuous conversion mode
  ads2.setMode(MODE_CONTIN);       // Continuous conversion mode
  ads1.setRate(RATE_250);       // 250SPS
  ads2.setRate(RATE_250);       // 250SPS
  ads1.setOSMode(OSMODE_SINGLE);   // Set to start a single-conversion
  ads2.setOSMode(OSMODE_SINGLE);   // Set to start a single-conversion

  ads1.begin();   // ADS1115 - 1 start
  ads2.begin();   // ADS1115 - 2 start

  SDCARD_CHECK_FAIL();
  
}



void COUNT_1MS(){ 
  count_value++;
  if(count_value == 3000){
    ADS1115_oneTime = false;
    count_value = 0;
  }
  if((ads1115_finish_value >= 1999) && (ads1115_finish_value <= 2001)){
      ads1115_finish_value = 0;
  }
}




/****************************************************************/
void loop() {

    if (!LoRaParameter_oneTime && !GPS_oneTime && !Setting_File_SDCARD_oneTime) {                      
      LoRa_SaveBuffer();
    }
    else if (LoRaParameter_oneTime && !GPS_oneTime && !Setting_File_SDCARD_oneTime) { 
      GPS_SaveBuffer();
    }
    else if (!Setting_File_SDCARD_oneTime && LoRaParameter_oneTime && GPS_oneTime){  
      Check_Setting_File_SDCARD();  
    } 
/*After the first boot, the above if code is not executed and the following code repeats the loop for 3 seconds. */
    else if (Setting_File_SDCARD_oneTime){ 
      if (!ADS1115_oneTime) {
        ADS1115_SaveBuffer();
      }else if(ADS1115_oneTime){
        ads1115_finish_value = count_value;
      }

      if((ads1115_finish_value > 2001) && (ads1115_finish_value <= 3000)){ 
        slave.poll();
      }
    } 
} // loop

I get values at first perfectly, but I get time out error after few seconds, it seems that the timing is still twisted. I do not know how to fix it.
If I remove the ads1115 function, all the sensors will function normally, and even if I call the Modbus value every 100ms, I get a value perfectly without error.

#2

Post pictures to the forum, we don't follow temporary URLs to Google or any other provider of such services!

Post complete code, your code does not compile!

I cannot find any Modbus functionality in your code.

#3