Software Serial Buffer Expansion

The change for software serial ports require a simple modification of the file:

<base Arduino folder>\hardware\arduino\avr\libraries\SoftwareSerial\SoftwareSerial.h

Change:

__#define _SS_MAX_RX_BUFF 64 // RX buffer size

To:

__#define _SS_MAX_RX_BUFF 256 // RX buffer size

Hardware Serial Buffer Expansion

The change for hardware serial ports require a simple modification of the file:

<base Arduino folder>\hardware\arduino\avr\cores\arduino\HardwareSerial.h

Change:

__#define SERIAL_TX_BUFFER_SIZE 64
__#define SERIAL_RX_BUFFER_SIZE 64

To:

__#define SERIAL_TX_BUFFER_SIZE 256
__#define SERIAL_RX_BUFFER_SIZE 256

Btw, you can copy the SoftwareSerial.cpp and h files from the Arduino directory in to your project directory and then include it with “(quotation marks) instead of the < (pointy brackets). If you do this, make sure to also change the #include <SoftwareSerial.h> in your copy of SoftwareSerial.cpp to “SoftwareSerial.h”.
~you use <pointy brackets> to include files from arduino libraries and
“quotes” to include from project directory.

Source: Internet of Home Things » Expanding Arduino Serial Port Buffer Size

Serial.write() just sends raw bytes of data.

Serial.print() converts and displays data in human readable forms (ASCII).

Source: Why Serial.write() instead of Serial.print()

Source: How to determine the capacity of the JsonDocument? | ArduinoJson 6

https://create.arduino.cc/projecthub/rafitc/what-is-watchdog-timer-fffe20

The architecture of this number format is the following:

S: sign
E: exponent
F: faction (also referred to as the mantissa or significand)

calculation would be = (-1)^S * 2^(E [dec format]-127) * (1.F)[Base 10]

Source: How are floating point values converted in Schneider Electric energy meters?

https://www.modbustools.com/download.html

https://www.modbusdriver.com/diagslave.html

https://circuitdigest.com/microcontroller-projects/rs-485-modbus-serial-communication-with-arduino-as-master

https://en.wikipedia.org/wiki/List_of_Star_Wars_planets_and_moons#Pasaana

Download archive into a folder. Then unpack the tarball:

tar xzf modpoll.tgz

The tarball contains multiple binaries for different CPU architectures. Add the version matching your system architecture to the path. Example for ARM platforms like Raspberry Pi:

export PATH=$PWD/modpoll/linux_arm-eabihf:$PATH

Then run modpoll:

modpoll -h

Source: Free Modbus Master Simulator and Test Tool

Source: MAX 485 & ModbusMaster – Basic Guide

Source: How to Use Modbus with Arduino – Arduino Project Hub