May 25, 2019 · Ciao a tutti! Nell'ultimo periodo sto cercando di approfondire la comunicazione Modbus su Arduino, utilizzando transceiver RS485 e moduli LoRa @868MHz. Per quanto riguarda la configurazione di Arduino come slave, ho seguito attentamente il seguente esempio e tutto funziona a dovere, anche via radio. Ora vorrei invece capire come funziona la programmazione del master, che, se non vado errato ...

Aug 20, 2022 · But, the slave actually shows on display "Trans" during the modbus intent of reading... The register i wan to read has the address 40103, its a float value. The wiring is: Arduino UNO - 5 to C25B - RO Arduino UNO - 6 to C25B - DI Arduino UNO - 9 to C25B - RE Arduino UNO - 10 to C25B - DE Arduino UNO - 5V to C25B - VCC Arduino UNO - …

Jul 31, 2018 · Hello everyone faced such a problem, there are two arduino, configure the modbus protocol, I encountered that the master sends requests to the slave, but slave does not receive them. Connected via rs485, RE DE pins are connected via 8 pin. With EASYtransfer library everything works, but modbus is needed Master /** * Modbus master example 1: * The purpose of this example is to query an array of ...

Nov 7, 2022 · Hi all.. I'm currently working on a project where I will send DHT11 and SW420 sensor data use RS485 Module from slaves 1 and 2 (using Arduino Nano) to the master (Arduino Uno). Here I use the modbus RTU library from GitHub - smarmengol/Modbus-Master-Slave-for-Arduino: Modbus Master-Slave library for Arduino. When I try to use 1 slave, the data is successfully sent to the master. However, when ...

Nov 16, 2023 · Hello everyone, this is my first post in Arduino Forum, and I am quite a beginner in using RS485 sensors, as I am having some trouble understanding Modbus RTU. Firstly I would like to thank everyone for taking your time to help me in this matter. I really appreciate the guidance and advices given here 🙂 I would like to use a RS485 based sensor with my NodeMCU ESP32 by using MAX485 converter ...

Jul 4, 2022 · Hi, I'm trying to interface with a Morningstar Tristar MPPT solar charge controller as a bit of a side project to complete my off-grid system. It has two networking interfaces, TCP and RS-232. I'm trying to read the data from the controller via RS-232 however MODBUS is completely new to me and I'm struggling to understand how to read the registers. The library I'm using is ModbusMaster. Here ...

Feb 1, 2024 · Hi I'm stuck trying to reform a 32 bit float from 2 unsigned 16 bit ints. I'm using an arduino as a modbus master to read a flow meter. the registers in the meter are all 16 bit but the device uses 2 registers to represent a 32 bit float.

Jan 15, 2019 · Buenas tardes: Normalmente he trabajado con Modbus RTU Slave y Modbus TCP Slave sin problemas. En este proyecto quiero que el arduino UNO sea maestro de un variador de velocidad de motores Schneider ATV 12 con comunicación Modbus RTU. Algo creo que le falta a mi código o librería equivocada. #include <ModbusMaster.h> #define MAX485_DE 2 // instantiate ModbusMaster object ModbusMaster node ...

Oct 27, 2024 · Have a good day. I am new to Arduino coding. I tried many programs on the internet to get the kg information from the weight indicator I have and write it to the serial port, but I failed. I need help from those who have experience with Arduino modbus master. I have a ttl to rs485 converter MAX485. I was able to read the kg information from the computer with Modbus Poll. I would be glad if you ...

Apr 23, 2021 · Hey, I am trying to send int type data through MODBUS with arduino uno acting as the master and a slave MODBUS simulator on my PC. Communication is working but the data i am sending is not right. Even though the value of temp1, temp2, etc is correct, it is not being sent correctly. Any suggestions or advice would be really helpful Below is the code #include <ModbusRtu.h> //#include ...