Raspberry Pi RS485 and MODBUS Read

#1

TL;DR
Can I read MODBUS registers (like these) directly from a device using Node Red using /dev/ttyUSB0? I just cant seem to make it work, mainly due to my very narrow scope of knowledge.

My current setup is a raspberry pi with a USB to RS485 Converter which is connected to my Epever 4210AN charge controller. Using these instructions as a foundation, I can read data from the solar charge controller that gets stored to a MySql database, this works great but I would love to have direct access to the charge controller via /dev/ttyUSB0. This is the current flow:

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temperature'];\nvar batterytemp = msg.payload[0]['Battery temperature'];\nvar BattStatus = msg.payload[0]['Battery status'];\nvar chargerStatus = msg.payload[0]['Equipment status'];\nvar time = msg.payload[0]['timestamp'];\n\nif ((msg.payload.indexOf('Database') === -1) && msg.topic.indexOf('Database') === -1){\n\n\nvar msg1 = {topic:\"PV array voltage\", payload: pvvoltage};\nvar msg2 = {topic:\"PV array current\", payload: pvcurrent};\nvar msg3 = {topic:\"PV array power\", payload: pvpower};\nvar msg4 = {topic:\"Battery voltage\", payload: voltage};\nvar msg5 = {topic:\"Battery charging current\", payload: battcurrent};\nvar msg6 = {topic:\"Battery charging power\", payload: battpower};\nvar msg7 = {topic:\"Battery SOC\", payload: battsoc};\nvar msg8 = {topic:\"[`Load voltage`]\", payload: loadvoltage};\nvar msg9 = {topic:\"[`Load current`]\", payload: loadcurrent};\nvar msg10 = {topic:\"[`Load power`]\", payload: loadpower};\nvar msg11 = {topic:\"[`System rated voltage`]\", payload: systemvoltage};\nvar msg12 = {topic:\"[`Charger temperature`]\", payload: chargertemp};\nvar msg13 = {topic:\"[`Battery temperature`]\", payload: batterytemp};\nvar msg14 = {topic:\"[`Battery status`]\", payload: BattStatus};\nvar msg15 = {topic:\"[`Equipment status`]\", payload: chargerStatus};\nvar msg16 = {topic:\"[`timestamp`]\", payload: time};\n\nreturn [msg1,msg2,msg3,msg4,msg5,msg6,msg7,msg8,msg9,msg10,msg11,msg12,msg13,msg14,msg15,msg16];\n\n} else 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I would love to get direct access to charge controller so i can get data faster. I've attempted this flow as a start to help me understand the fundamentals but they still escape me. Do i need a MODBUS server and Modbus Read and a MODBUS response to get the information? And is a register the same as an address?

Any help would be appreciated, thank you.

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#2

Yes, persevere with the node-red-contrib-modbus example, it should contain the basics of what you need. Also read the readme for the node carefully and have a look at the wiki. Do a bit of googling about modbus itself to understand the basics of that. Googling for
modbus tutorial
shows lots of hits.
When you have spent a few hours doing that then if you still can't get it going come back here and describe what you have achieved and what is not working.

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#3

The modbus node works great, the work is to interpret the modbus codes and registers from the manufacturer. This example flow is a start for the modbus information you have given but you would need to select USB0 in modbus server configuration. Then it is to change the register settings in the read node until you get some value and then work back to the listed values in the modbus registers. I have used these USB to RS485 adapters and they work fine

[{"id":"c0a4e975.6a6818","type":"modbus-read","z":"2937cc5b.863af4","name":"","topic":"","showStatusActivities":false,"logIOActivities":false,"showErrors":false,"unitid":"1","dataType":"InputRegister","adr":"4","quantity":"2","rate":"5","rateUnit":"s","delayOnStart":false,"startDelayTime":"","server":"ae0fd54.477a028","useIOFile":false,"ioFile":"","useIOForPayload":false,"x":160,"y":80,"wires":[[],["52600fa7.9b7bb"]]},{"id":"52600fa7.9b7bb","type":"modbus-response","z":"2937cc5b.863af4","name":"","registerShowMax":20,"x":460,"y":100,"wires":[]},{"id":"ae0fd54.477a028","type":"modbus-client","z":"","name":"","clienttype":"serial","bufferCommands":true,"stateLogEnabled":false,"tcpHost":"127.0.0.1","tcpPort":"502","tcpType":"DEFAULT","serialPort":"/dev/ttyUSB","serialType":"RTU-BUFFERD","serialBaudrate":"115200","serialDatabits":"8","serialStopbits":"1","serialParity":"none","serialConnectionDelay":"100","unit_id":"1","commandDelay":"1","clientTimeout":"1000","reconnectTimeout":"2000"}]

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#4

Thank you both the replies. I must have needed a good night sleep... because this morning i imported mtoko's flow but was getting "modbus exception 2", after researching it i found out the address was wrong, then i reviewed the address doc again and saw this...
image
Ugh, how could i have missed it, anyways after converting the address to decimal i am getting data now!
image

Wow I guess i just needed to step away and RTFM better.

Now that I am getting data, how do i convert this payload to decimals or human readable?

UPDATE: Disregard my last question. I figured it out and now i am reading all addresses perfectly, what a high!

Thank you All!

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