Questions tagged [modbus]
Modbus is a simple protocol for serial communication between electronic devices.
25
questions with no upvoted or accepted answers
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295 views
Modbus TCP/IP using Arduino uno and ENC28J60 module
I have this project where I need a modbus tcp server that will host a series of sensor data for other modbus client devices to read. I use this Library by Andresoarmento
This is the code i am using ...
2
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0answers
507 views
Arduino Modbus slave error
I am trying to use Arduino as Modbus- RTU slave and Raspberry Pi as a Modbus master I have interfaced Max485 (RS485 to TTL converter) with Arduino and Rs485 to USB converter in Raspberry Pi, Initially,...
2
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0answers
1k views
Modbus Protocol RTU
I have simple code working on Serial Communication asn below. With Same data i would impliment Modbus protocol> I have Used Modbus library for arduino earlier which works fine with 9600 baudrate and ...
2
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0answers
728 views
Negative value conversion for modbus slave
I have an analog sensor which reads values 0-5v, -75 degrees to 75 degrees. Now I have converted to +75 degrees and -75 degrees format depend on the voltage.
From 2.5v to 5v data is read properly (i....
1
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0answers
28 views
The Pfieffer Vacuum Protocol for RS485
i am working on a control Interface for serveral Components including turbo Pumps from the company Pfeiffer.
The communication will be done according to the The Pfieffer Vacuum Protocol for RS485.
...
1
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0answers
81 views
ESP32-POE/ISO unstable after 10 days of power up
i have one ESP32-POE and ESP32-POE and i'm using the Olimex RS485 module to read a power meter that is placed near the ESP32 (5 meters of CAT5 cable - 9600 8N1).
My device has this workflow (it's ...
1
vote
0answers
453 views
How can i read and write the data from a Delta plc-s series through Arduino UNO?
I am trying to communicate PLC with arduino through rs232 as well rs 485. But, I am not able to read and write data. I can observe the data in PLC through ladder logic but not in arduino. I am trying ...
1
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0answers
871 views
can ModbusRtu.h library send data from slave to master using modbus(RS485) module?
i am using ModbusRtu.h library for modbus protocol. it works for sending data from master to slave but it can not send data from slave to master.
master code:
#include <ModbusRtu.h>
#define ...
1
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0answers
50 views
I am interfacing Amonia Sensor RS485 output with Arduino Mega . not getting any response
I am interfacing Amonia Sensor RS485 output with Arduino Mega but not getting any response. i need to transmit {0x06, 0x03, 0x00, 0x00, 0x00, 0x04, 0x45, 0xBE};
frame to sensor then senor will send ...
1
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0answers
267 views
Reading a simple sensor with Modbus RTU on Arduino Uno
I'm integrating a wind direction- and speed sensor with an Arduino. It communicates over RS485 Modbus RTU, which I don't have any experience with.
The documentation is very short, and it just says:
...
1
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0answers
305 views
Arduino Mega with SIM800L running Modbus TCP/IP
I'm trying to set up an Arduino Mega with a SIM800L module and trying to get Modbus TCP running on said Mega. I've set Modbus TCP over wifi and serial before but I used libraries for those. The ...
1
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0answers
521 views
Unable to read data more than once via Modbus RTU
I'm a newbie to this forum so kindly excuse me for any errors.
I'm using an Arduino Uno and Max485 (RS-485 to TTL) to communicate with a Power meter, but I'm able to receive the data from the Power ...
1
vote
0answers
251 views
RS485 Arduino Communication Issue
Friends, I am trying to achieve half duplex communication between two Arduinos using RS485 Protocol. The hardware I am using is a MAX485 module and an Arduino Uno. I am using the SoftwareSerial ...
1
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0answers
121 views
Arduino as Modbus RS485 slave using only 2 Digital pins
I want to use RX(0) and TX(1) Pins to make Arduino as an RS485 slave. To do this I am using MAX485 IC (Breakout board) https://datasheets.maximintegrated.com/en/ds/MAX1487-MAX491.pdf
The problem here ...
1
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0answers
1k views
Arduino Modbus - Rtu slave with Raspberry pi using MAX-485
I am trying to use Arduino as Modbus- RTU slave and Raspberry Pi as a Modbus master
I have interfaced Max485 (RS485 to TTL converter) with Arduino and Rs485 to USB converter in Raspberry Pi, Initially,...
1
vote
0answers
242 views
Anyone using ModBus RTU on Galileo gen 2?
I'm trying to communicate with some industrial hardware, on ModBusRTU, from my Intel Galileo Gen2 board. I use this board to convert UART to RS485 http://linksprite.com/wiki/index.php5?title=...
1
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0answers
1k views
MODbus response for configure data
I am not able to receive data. I am able to send data from master but am not getting any response. This program uploaded successfully. I have below setup to monitor data from Modbus.
I have included ...
0
votes
1answer
46 views
Modbus TCP together with MQTT over same ethernet
I'm currently in a planning phase for a project.
I want to read some sensor data over Modbus TCP, do some simple calculations on the Arduino and publish the results over MQTT. Which means I have 2 RJ-...
0
votes
0answers
78 views
Modbus RTU MAX485 AFD Yaskawa V1000
I need some help with my proyect. I want send some data to an AFD Yaskawa V1000. I have the bytes test and I send it but I cant comunicate with it. The AFD just show an 'CALL' error, means dont have ...
0
votes
0answers
89 views
ModbusMaster - Read 64 Bit integer
i'm using ModbusMaster library (Repo) to read from a device some registers.
Many of them are float and i've no problem to read them using the following code:
//for float conversation
union
{
...
0
votes
1answer
557 views
read data from controller via RS485 Modbus rtu Arduino
I have a device with an rs485 port from which I would like to read the ph value. Below is the connection with the RS485 adapter.
I tried to read the data with this code but doesn't work:
#include ...
0
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0answers
41 views
Modbus programming
I have a Controllino Mega running a code that rotates a stepper one revolution CW, and one revoluction CCW.
I need the program to run, just when a signal is received from an HMI that I have connected ...
0
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0answers
84 views
how to link arduino uno and wonderware via modbus?
I am trying to make my Arduino uno and gy-521 accelerometer a modbus tcp server to feed data to a client on my pc. Most likely the HMI I am going to be using is wonder ware.
#include <Wire.h>
...
-1
votes
1answer
451 views
How to Use Function Code 6 Modbus RTU library
I'm trying to communicate with a temperature controller using Modbus RTU.
I used this Arduino library.
I was able to read PV(current temperature value) using below code. It uses Function code 4.
I ...
-1
votes
1answer
936 views
Multiple #ifndef vs. single one #endif
My question is connected with the issue as linked:
Is there any good working MODBUS TCP master library available for Arduino?
An example of Modbus TCP master library as suggested in the post above. A ...
