I am trying to connect a device which is connected to USB to RS485 Converter which i have connected to raspberry pi. i have tested the device on windows which is working fine but i want to do communication between node red and the device using USB to RS485 Converter.i have the connection details on…

With the adaptor unplugged run ls /dev/serial/by-id/ and note what is there (there may be nothing if you have no serial devices plugged in. Then plug it in and run the command again, you should see an entry there now (or an additional entry). For example, mine shows ls /dev/serial/by-id/ usb-FT…

@Colin can we contact on phone or whatsapp

No, use the forum please, then others can help if appropriate.

So @Colin as your wrote but the thing is how to add it in NodeRED because i add serialport in NodeRED and the com Id so but it did give me feedback on wheather it is working because it shows me connected so what function or what should I add so i can get some feedback from PLC to NodeRED.

That is an entirely different question. What protocols does your plc support? Modbus possibly? If it supports modbus then remove the serial node and try node-red-contrib-modbus. You will need to do some research about modbus so you understand the principles, and look at the docs for the PLC to find…

@Colin can you guide me well Because i don't know what to do, I have a working simple program in ML_1400 which is working on ethernet, but I need to try it on USB this is why I was asking you whether you can help me through social media, but in fact you decline it therefore I don't understand what t…

[image] Jayeshpitale1: working on ethernet, but I need to try it on USB Why do you need to use serial connection? Can you not use the ethernet connection? In ML_1400, whatever that is, what protocol does it use to communicate with the PLC?

yes as your point is correct but for ML 1200 it has only USB using RS 232 or RS 485 so i need to know how to communicate with that in nodeRED

Since you have not, apparently, attempted to find out whether the ML_1200 supports modbus I have just googled it for you and it seems appear that it does. Therefore you need to study the manuals to find out how to use it on the device, then you should be able to use node-red-contrib-modbus nodes to…

@Colin if i had understand the concept why I would ask this question in node RED and still i can't understand how the protocol work how to connect Modbus to USB

Communication Between RS485 to Node red on raspberry pi

Industrial

Colin 26 November 2022 14:32 13

@Jayeshpitale1 you might like to follow this thread which appears to be asking a similar question to yourself. How to find address for ML 1200 for modbus or RS485

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Communication Between RS485 to Node red on raspberry pi

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