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Questions tagged [modbus]

The tag has no usage guidance.

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0answers
45 views

pymodbus error: [Input/Output] No response received from the remote unit/Unable to decode response

I've been having connection errors on my Raspberry Pi 3B using pymodbus. Designed a board using MAX14854G as the RS-485 transceiver that is connected to the RPI3's UART pins (8 & 10). Currently ...
0
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1answer
77 views

pymodbus on Raspberry Pi 3B and Energy Meter

Followed this thread on enabling the serial console on the Raspberry Pi 3B. Checked the functionality using this code: dmesg | grep tty Which produced these results: ... console [tty1] enabled ......
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0answers
97 views

Connect raspberry pi3 to PLC with switch

I want to connect RPi3 to PLC with network switch to communicate by modbus protocol (RPi as a server and PLC as a client). without network switch the connection works fine, but when a network switch ...
0
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0answers
166 views

Raspberry PI HMI

Is it possible to make a Raspberry Pi 3 into a functional HMI for an instrument or set of PLC devices(I usually control remote devices through TCP unless I build the HMI into the unit's case)? I would ...
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0answers
260 views

Modbus test UI software for Raspberry Pi

I have a Modbus connected over ttyUSB0 in raspberry pi 3. I have to write a python code to interface it but before that I was just wondering is there any test ui software just like modbus-master ...
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0answers
237 views

Connect multiple sensors on a single USB to RS485 adapter

On tindie I bought a RS485 soil moisture sensor with a USB to RS485 dongle. I want to add more sensors for monotorring multiple plants. Since RS485 is a bus system, it seems basically possible to ...
0
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1answer
100 views

Raspberry Pi 24/7 Modbus Rtu proyect

the conpany i work for is making a proyect, we made Modbus RTU connection using raspberry pi 3 as a gateway, and saving the data to Mysql. this proyect have to be 24/7 and running forever, im ...
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0answers
94 views

Modbus TCP server populated with values from NRF24L01+

I currently have the Raspberry Pi 3 collecting data from different sensors using a network based in Arduino Nanos and NRF24L01+. Raspberry being the master and the Nanos being the slaves. All of this ...
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1answer
465 views

Serial USB-RS485 failing to read on Pi but not on Ubuntu laptop?

I am reading values from a Battery Management System using two, serial USB-RS485 adaptors (ftdi). I am doing this over MODBUS using the minimal modbus library and python: # Bank A # port name, slave ...
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0answers
1k views

Modbus TCP/IP communication with PC

I am trying to communicate my PC with RPi via Modbus TCP/IP. I want my Raspberry Pi as client and server (not at the same time). I am accessing RPi through VNC. What should be my host and port number? ...
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2answers
353 views

Raspberry Pi instead of PLC

Good morning, I am PLC engineer I have worked with PLC many years but I have plan to use raspberry pi instead of PLC because its less expensive than PLC. I plan to use it in Building Management ...
0
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1answer
232 views

minimal modbus scaling

Running a simple modbus program; import time import minimalmodbus minimalmodbus.BAUDRATE = 9600 #changed to suit snapper+ default slave = minimalmodbus.Instrument('/dev/...
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1answer
2k views

Reading registers through pymodbus

I have been trying to use pymodbus to read registers from a power meter and searching around here I found a useful code from the question I attach in the end of this post. So I wrote/copied the next ...
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0answers
111 views

Enable Rs485 using timer555

I'm looking for some help with a PCB design i'm doing, i want to connect a power analyzer thar requites Modbus protochol, using 485 halfduplex For that to work i need to enable a disable the rs485 ...
1
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1answer
3k views

How do I program a Raspberry Pi obtain information from PLC's registers using Modbus TCP/ICP?

I am trying to extract data from programmable logic controller's registers using Raspberry PI module and then display it on screen. I have installed pymodbus package on my Rpi. I am quite unsure how ...
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0answers
470 views

ModBus RS485 adapter for GPIO

I have just purchased my first Raspberry Pi 2B. We plan on using it to develop a standalone application with a very high reliability requirement (isolated locations). Is it possible to connect it to ...
3
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0answers
483 views

Modbus on Raspberry Pi

I am quite new to Raspberry Pi and Modbus. I am going to implement a Modbus RTU on Raspberry Pi using libmodbus. I followed this totorial as a simple Modbus test, but when I compile the bandwidth-...
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2answers
703 views

Error in reading data with pymodbus

I have been trying to read data from a modbus slave device using pymodbus. After much research I found this code on internet. It is a straight forward code. I am able to read the data on windows but ...
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0answers
2k views

Is there a modbus rtu tester for Raspberry PI?

I need a tester much like modpoll but one that runs on Raspbian OS. I need to check if my Raspberry Pi is able to communicate with my modbus slaves.
2
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1answer
4k views

For communicating with a modbus rtu slave using rs485 to usb converter, does Raspberry Pi require any configuration?

I have a modbus slave device and a rs485 to usb converter. I used the converter and successfully read data from the slave device with my laptop but when I try to use it with the Raspberry Pi I am ...
5
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5answers
34k views

pymodbus rtu RS-485 communication

I have this little device for communication, and I can see the dongle after lsusb, and it is attached to ttyUSB0 (output from dmesg). Since the module has its driver that is installed to Raspberry Pi, ...
3
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2answers
14k views

RS-485 and Raspberry Pi

How does RS-485 communication between Raspberry Pi and various sensors work? Note: I would like to use it with Pyhton 2.7. Can I connect ADM485 to the UART (Tx, Rx) of Raspberry Pi? I want to use ...