I am trying to read a energy meter data using Arduino uno. The energy meter communicates through MODBUS. I have connected the Meter with Arduino through RS-485 to TTL but I am unable to get the data. The aim is to read the register data from ENergy meter and print on serial monitor. Please help me f…

Hi, it would make our attempt to help a lot easier if you let us know which meter model, datasheet, link or image, which RS485 module you are using and which link you used to download the "ModbusMaster.h" library. (I recommend that when using libraries that are not the IDE's default ones, comment…

His datasheet link is in the first post.

Thanks for your reply @ruilviana I have used the ModbusMaster library from here I am using MAX485 chip based module

Print the error code in hex and check what the library tells you. 0xE0 (224) is "id not matching". Imho your register 30001 is far off. Try numbering start with 0 instead.

@noiasca I don't know why it's showing these error code. I checked on modbus software using the same slave ID but there it's showing data

Seems overly simple, but are you certain that the Rx and Tx pins of your Arduino module are/are-not swapped? My RS-485 transceiver board has LEDs for both Tx and Rx pins which makes basic wiring troubleshooting a bit easier (at least you know that you are getting Tx and Rx "bit" transmissions both T…

Error in Modbus RTU communication using Arduino Uno

Projects Networking, Protocols, and Devices

noiasca June 26, 2022, 6:31am 7

have you tried to read

result = node.readInputRegisters(0,1);

as a first step? What are the hex error codes then?

Interfacing RS485 (Modbus RTU) energy meter with arduino uno error

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Error in Modbus RTU communication using Arduino Uno

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