Raspberry Pi RS485 and MODBUS Read

General
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:

[{"id":"667e4b4.2c2ddb4","type":"tab","label":"Home","disabled":false,"info":""},{"id":"10052ee4.e1cb29","type":"mysql","z":"667e4b4.2c2ddb4","mydb":"b1efcb9b.8e44a8","name":"Solardata","x":340,"y":340,"wires":[["b33a969a.d67fa8"]]},{"id":"17e917a.b349668","type":"inject","z":"667e4b4.2c2ddb4","name":"","topic":"SELECT `timestamp`, `PV array voltage`, `PV array current`, `PV array power`, `Battery voltage`, `Battery charging current`, `Battery charging power`, `Load voltage`, `Load current`, `Load power`, `Battery temperature`, `Charger temperature`, `Heat sink temperature`, `Battery SOC`, `Remote battery temperature`, `System rated voltage`, `Battery status`, `Equipment status` FROM `stats` ORDER BY `timestamp` DESC LIMIT 1 ","payload":"","payloadType":"str","repeat":"10","crontab":"","once":false,"onceDelay":"1","x":150,"y":280,"wires":[["10052ee4.e1cb29"]]},{"id":"76c4ef38.d037a8","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Battery Voltage","group":"45d13185.8fc46","order":4,"width":"6","height":"6","gtype":"gage","title":"Battery voltage","label":"Volts","format":"{{value}} V","min":"10","max":"14.4","colors":["#b50012","#ffff00","#00ff00"],"seg1":"11","seg2":"12.3","x":920,"y":220,"wires":[]},{"id":"b33a969a.d67fa8","type":"function","z":"667e4b4.2c2ddb4","name":"parse data","func":"var pvvoltage = msg.payload[0]['PV array voltage'];\nvar pvcurrent = msg.payload[0]['PV array current'];\nvar pvpower = msg.payload[0]['PV array power'];\nvar voltage = msg.payload[0]['Battery voltage'];\nvar battcurrent = msg.payload[0]['Battery charging current'];\nvar battpower = msg.payload[0]['Battery charging power'];\nvar battsoc = msg.payload[0]['Battery SOC'];\nvar loadvoltage = msg.payload[0]['Load voltage'];\nvar loadcurrent = msg.payload[0]['Load current'];\nvar loadpower = msg.payload[0]['Load power'];\nvar systemvoltage = msg.payload[0]['System rated voltage'];\nvar chargertemp = msg.payload[0]['Charger 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 {\nreturn;\n}\n","outputs":16,"noerr":0,"x":530,"y":340,"wires":[["96f15064.623d08","2859335a.645c1c"],["96f15064.623d08","fcce6d79.bd5cc8"],["96f15064.623d08","e6f7ee90.a612f8"],["9e8f4740.2c9988","76c4ef38.d037a8","da8bfe82.6c27e8"],["9e8f4740.2c9988","9d2d8726.81c89"],["9e8f4740.2c9988","59a9024.73bfa7c"],["b0ca5242.a7d528"],["904e4906.1d825"],["5918bab0.0a7f74","2a205d54.c55962"],["52303b34.1b74c4"],["59da7916.cfab"],["b7599030.e45248"],["5a505a49.e54474"],["70d5e82b.9d8288"],["c1854510.93c628"],["23999d1e.2ff562"]]},{"id":"96f15064.623d08","type":"ui_chart","z":"667e4b4.2c2ddb4","name":"PV Performance","group":"3808d133.fb735e","order":1,"width":"20","height":"9","label":"Recent PV Performance","chartType":"line","legend":"false","xformat":"HH:mm","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"","removeOlder":"24","removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":1260,"y":380,"wires":[[],[]]},{"id":"2859335a.645c1c","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"PV Volts","group":"45d13185.8fc46","order":1,"width":"6","height":"6","gtype":"gage","title":"PV Volts","label":"Volts","format":"{{value}} V","min":"0","max":"60","colors":["#ff0000","#ffff00","#00ff00"],"seg1":"5","seg2":"30","x":900,"y":80,"wires":[]},{"id":"9d2d8726.81c89","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"","group":"45d13185.8fc46","order":5,"width":"6","height":"6","gtype":"gage","title":"Battery charging current","label":"Amps","format":"{{value}} A","min":0,"max":10,"colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":950,"y":260,"wires":[]},{"id":"59a9024.73bfa7c","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Battery Charging Watts","group":"45d13185.8fc46","order":6,"width":"6","height":"6","gtype":"gage","title":"Battery charging power","label":"Watts","format":"{{value}} W","min":0,"max":"200","colors":["#00b500","#e6e600","#ca3838"],"seg1":"50","seg2":"100","x":950,"y":300,"wires":[]},{"id":"fcce6d79.bd5cc8","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"PV Amps","group":"45d13185.8fc46","order":2,"width":"6","height":"6","gtype":"gage","title":"PV Amps","label":"Amps","format":"{{value}} A","min":"0","max":"10","colors":["#ff0000","#ffff00","#00ff00"],"seg1":"1","seg2":"5","x":900,"y":120,"wires":[]},{"id":"e6f7ee90.a612f8","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"PV Watts","group":"45d13185.8fc46","order":3,"width":"6","height":"6","gtype":"gage","title":"PV Watts","label":"Watts","format":"{{value}} W","min":"0","max":"200","colors":["#00e606","#00e606","#ca3838"],"seg1":"","seg2":"100","x":900,"y":160,"wires":[]},{"id":"9e8f4740.2c9988","type":"ui_chart","z":"667e4b4.2c2ddb4","name":"Battery Performance","group":"3808d133.fb735e","order":3,"width":"20","height":"7","label":"Recent Battery Performance","chartType":"line","legend":"false","xformat":"HH:mm","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"","removeOlder":"36","removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":1280,"y":420,"wires":[[],[]]},{"id":"b0ca5242.a7d528","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Battery SoC","group":"b9d11553.55a72","order":5,"width":"6","height":"6","gtype":"gage","title":"Battery SOC","label":"","format":"{{value}} %","min":0,"max":"100","colors":["#ff0000","#e6e600","#80ff00"],"seg1":"25","seg2":"50","x":910,"y":340,"wires":[]},{"id":"b10f8444.3004a","type":"ui_text","z":"667e4b4.2c2ddb4","group":"b9d11553.55a72","order":2,"width":"0","height":"0","name":"Charger status","label":"Charger status","format":"<font color= {{msg.color}}> <font size=\"3\"> {{msg.label}} </font></font>&nbsp<i class=\"{{msg.icon}}\"></i>","layout":"row-spread","x":1060,"y":760,"wires":[]},{"id":"1e1204ee.e54453","type":"ui_text","z":"667e4b4.2c2ddb4","group":"b9d11553.55a72","order":3,"width":"0","height":"0","name":"BattStatus","label":"BattStatus","format":"<font color= {{msg.colour}}> {{msg.label}} </font>&nbsp<i class=\"{{msg.icon}}\"></i>","layout":"row-spread","x":1050,"y":680,"wires":[]},{"id":"904e4906.1d825","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Load Voltage","group":"45d13185.8fc46","order":7,"width":"6","height":"6","gtype":"gage","title":"Load Voltage","label":"Volts","format":"{{value}} V","min":"10","max":"14.4","colors":["#b50012","#ffff00","#00ff00"],"seg1":"11","seg2":"12.3","x":910,"y":400,"wires":[]},{"id":"5918bab0.0a7f74","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Load Current","group":"45d13185.8fc46","order":8,"width":"6","height":"6","gtype":"gage","title":"Load current","label":"Amps","format":"{{value}} A","min":0,"max":10,"colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":910,"y":440,"wires":[]},{"id":"52303b34.1b74c4","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Load Power","group":"45d13185.8fc46","order":9,"width":"6","height":"6","gtype":"gage","title":"Load Power","label":"Watts","format":"{{value}} W","min":0,"max":"200","colors":["#00b500","#e6e600","#ca3838"],"seg1":"50","seg2":"100","x":910,"y":480,"wires":[]},{"id":"59da7916.cfab","type":"ui_text","z":"667e4b4.2c2ddb4","group":"b9d11553.55a72","order":4,"width":"0","height":"0","name":"systemvoltage","label":"System Voltage","format":"{{msg.payload}} Volts","layout":"row-spread","x":920,"y":540,"wires":[]},{"id":"5a505a49.e54474","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Battery Temp","group":"b9d11553.55a72","order":6,"width":"4","height":"4","gtype":"donut","title":"Battery Temp","label":"C","format":"{{value}}","min":0,"max":"80","colors":["#00b500","#e6e600","#ca3838"],"seg1":"28","seg2":"40","x":910,"y":620,"wires":[]},{"id":"b7599030.e45248","type":"ui_gauge","z":"667e4b4.2c2ddb4","name":"Charger Temp","group":"b9d11553.55a72","order":7,"width":"4","height":"4","gtype":"donut","title":"Charger Temp","label":"C","format":"{{value}}","min":0,"max":"80","colors":["#00b500","#e6e600","#ca3838"],"seg1":"28","seg2":"40","x":920,"y":580,"wires":[]},{"id":"70d5e82b.9d8288","type":"function","z":"667e4b4.2c2ddb4","name":"Battery Status","func":"var bs = +msg.payload;\nvar b = 0b11 & (bs >> 2);\n//var b = msg.payload[0]['Battery status'];\n//bl = 0b1111 & b;\n\n\n    switch (b) {\n        case 0: \n           var bStatus = \"Normal\";\n               msg.label = bStatus;\n               //msg.colour = \"#45B222\";\n               msg.icon = \"fa fa-thumbs-up fa-2x nr-dashboard-ok\"\n            return msg;\n        case 1: \n           var bStatus = \"<font color=\\\"red\\\">Overvolt</font>\";\n                msg.label = bStatus;\n                msg.colour = \"red\";\n                msg.background = \"green\";\n                \n                return msg;\n        case 2: \n           var bStatus = \"<font color=\\\"yellow\\\">Undervolt</font>\";\n                msg.label = bStatus;\n                msg.colour = \"red\";\n                msg.background = \"green\";\n            return msg;\n        case 3: \n           var bStatus = \"<font color=\\\"red\\\">Low volt disconnect</font>\";\n                msg.label = bStatus;\n                msg.colour = \"yellow\";\n                msg.background = \"green\";\n           return msg;\n        case 4: \n            {\n              var  bStatus = \"<font color=\\\"red\\\">FAULT</font>\";\n                msg.label = bStatus;\n                msg.colour = \"red\";\n                msg.background = \"green\";\nreturn msg;\n            }\n    }","outputs":1,"noerr":0,"x":820,"y":680,"wires":[["1e1204ee.e54453"]]},{"id":"c1854510.93c628","type":"function","z":"667e4b4.2c2ddb4","name":"Charger Status","func":"var equipStatus = +msg.payload;\nvar chargStatus = 0b11 & (equipStatus >> 2);\n\nswitch (chargStatus) {\ncase 0: \n    var eStatus = \"Not charging\";\n    msg.label = eStatus;\n    msg.icon = \"fa fa-bed fa-2x nr-dashboard-ok\"\n    //node.warn(\"0\");\n    return msg;\n    \ncase 1: \n    eStatus = \"Float (13.8V)\";\n    msg.label = eStatus;\n    msg.icon = \"fa fa-ship fa-2x nr-dashboard-ok\"\n    //node.warn(\"1\");\n    return msg;\n\ncase 2: \n    var eStatus = \"Boost (14.4V)\";\n    msg.label = eStatus;\n    msg.icon = \"fa fa-rocket fa-2x nr-dashboard-ok\"\n    //node.warn(\"2\");\n    return msg;\n\ncase 3: \n    var eStatus = \"Equalization (14.6V)\";\n    msg.label = eStatus;\n    //node.warn(\"3\");\n    return msg;\n}\n\nif (equipStatus >> 4) {\n    var eStatus = \"FAULT\";\n    msg.label = eStatus;\n    //node.warn(\"4\");\n    return msg;\n}","outputs":1,"noerr":0,"x":820,"y":740,"wires":[["b10f8444.3004a"]]},{"id":"65962744.f35fb8","type":"ui_text","z":"667e4b4.2c2ddb4","group":"b9d11553.55a72","order":9,"width":"4","height":"1","name":"","label":"","format":"<font color= {{msg.colour}}> {{msg.label}} </font>&nbsp<i class=\"{{msg.icon}}\"></i>","layout":"row-spread","x":430,"y":760,"wires":[]},{"id":"2a205d54.c55962","type":"function","z":"667e4b4.2c2ddb4","name":"Load Status","func":"var loadcurrent = +msg.payload\nif(loadcurrent == 0){\n    msg.label = \"Load Off\";\n    msg.payload = 0\n    msg.topic = \"state\"\n    msg.colour = \"#000\";\n    msg.background = \"green\";\n    msg.icon = \"fa fa-lightbulb-o fa-2x nr-dashboard-error\"\n    return msg;\n}\n\n\nelse{\n    msg.label = \"Load On\";\n    msg.payload = 1\n    msg.topic = \"state\"\n    msg.colour = \"#f44242\";\n    msg.background = \"red\";\n        msg.icon = \"fa fa-lightbulb-o fa-2x nr-dashboard-ok\"\n    return msg;\n}\nreturn msg;","outputs":1,"noerr":0,"x":230,"y":760,"wires":[["65962744.f35fb8","660d9be2.705d54"]]},{"id":"660d9be2.705d54","type":"ui_switch","z":"667e4b4.2c2ddb4","name":"","label":"Load on/off","group":"b9d11553.55a72","order":8,"width":"4","height":"1","passthru":false,"decouple":"false","topic":"state","style":"","onvalue":"1","onvalueType":"num","onicon":"","oncolor":"","offvalue":"0","offvalueType":"num","officon":"","offcolor":"","x":310,"y":860,"wires":[["60165eb.f4e742","3397a8db.f117"]]},{"id":"70e4f86d.0164d8","type":"switch","z":"667e4b4.2c2ddb4","name":"","property":"override","propertyType":"global","rules":[{"t":"eq","v":"off","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":290,"y":960,"wires":[["60165eb.f4e742"]]},{"id":"f8cbd4d7.4d641","type":"change","z":"667e4b4.2c2ddb4","name":"global override","rules":[{"t":"set","p":"override","pt":"global","to":"on","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":665.0000076293945,"y":922.5,"wires":[["bad329ad.5b5998"]]},{"id":"3397a8db.f117","type":"switch","z":"667e4b4.2c2ddb4","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"eq","v":"0","vt":"num"}],"checkall":"true","repair":false,"outputs":2,"x":482.50000762939453,"y":943.75,"wires":[["f8cbd4d7.4d641"],["a90d2335.99f42"]]},{"id":"a90d2335.99f42","type":"change","z":"667e4b4.2c2ddb4","name":"global override","rules":[{"t":"set","p":"override","pt":"global","to":"off","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":667.5,"y":962.4999866485596,"wires":[["4fa01470.91178c"]]},{"id":"bad329ad.5b5998","type":"exec","z":"667e4b4.2c2ddb4","command":"sudo ./loadon.sh","addpay":true,"append":"","useSpawn":"false","timer":"5","oldrc":false,"name":"Turn Load On","x":1032.5000076293945,"y":885.0000019073486,"wires":[[],[],[]]},{"id":"4fa01470.91178c","type":"exec","z":"667e4b4.2c2ddb4","command":"sudo ./loadoff.sh","addpay":false,"append":"","useSpawn":"false","timer":"5","oldrc":false,"name":"Turn Load Off","x":1032.5000076293945,"y":965.0000019073486,"wires":[[],[],[]],"outputLabels":["Normal","",""]},{"id":"60165eb.f4e742","type":"smartswitch","z":"667e4b4.2c2ddb4","name":"switch","topic":"main","timeout":"0","x":550,"y":860,"wires":[[]]},{"id":"da8bfe82.6c27e8","type":"function","z":"667e4b4.2c2ddb4","name":"Battery Voltage Alert","func":"var voltage = +msg.payload\n\nif (voltage <= 11) {\n\nmsg = {\n    payload :\"Battery level is low (\" + msg.payload + \" volts)  - \" + Date().toString(),\n    topic : \"Alert!\",\n}\n    return msg;\n}","outputs":1,"noerr":0,"x":1280,"y":480,"wires":[["cc105bc5.27c3a"]]},{"id":"cc105bc5.27c3a","type":"e-mail","z":"667e4b4.2c2ddb4","server":"smtp.gmail.com","port":"465","secure":true,"name":"2088500464@vzwpix.com","dname":"Gmail","x":1490,"y":480,"wires":[]},{"id":"dc719985.5a6bd","type":"ui_text","z":"667e4b4.2c2ddb4","group":"b9d11553.55a72","order":1,"width":0,"height":0,"name":"","label":"TIme","format":"{{msg.payload}}","layout":"row-spread","x":1410,"y":600,"wires":[]},{"id":"23999d1e.2ff562","type":"moment","z":"667e4b4.2c2ddb4","name":"UTC-6","topic":"UTC-6","input":"payload","inputType":"msg","inTz":"ETC/GMT-6","adjAmount":0,"adjType":"days","adjDir":"add","format":"HH:mm:ss - ddd Do MMM YYYY","locale":"en_US","output":"payload","outputType":"msg","outTz":"America/Boise","x":1230,"y":600,"wires":[["dc719985.5a6bd"]]},{"id":"b1efcb9b.8e44a8","type":"MySQLdatabase","z":"","host":"127.0.0.1","port":"3306","db":"solardata","tz":""},{"id":"45d13185.8fc46","type":"ui_group","z":"","name":"Dashboard","tab":"c569e95d.e2ea7","order":3,"disp":true,"width":"20","collapse":true},{"id":"3808d133.fb735e","type":"ui_group","z":"","name":"Graphs","tab":"1efaaf44.9015f1","order":1,"disp":true,"width":"20","collapse":false},{"id":"b9d11553.55a72","type":"ui_group","z":"","name":"Status","tab":"c569e95d.e2ea7","order":4,"disp":true,"width":"8","collapse":true},{"id":"c569e95d.e2ea7","type":"ui_tab","z":"","name":"Home","icon":"dashboard","order":1},{"id":"1efaaf44.9015f1","type":"ui_tab","z":"","name":"Stats","icon":"dashboard","order":2}]

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.

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.

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"}]

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!

5

hello admintite! I am in the exact same stage. Whould u be so kind and post your flow file? would be very much appreciated! thanks.

6

Sure thing, see uploaded file.
Note: I haven't used my EEpever charger in a while but this code was working.

Node Red Registers Working.txt (53.1 KB)

7

Thanks so much! i still had problems when i used the factory cable but as soon as i used a rs485 to usb converter, bam it worked!