I am unable to Get Float value from Energy Meter using Modbus RTU serial.
I am getting completely wrong value.
Set address to 100 & check again.
Edit...
Just noticed you have a multiplier of 0.01 -- remove that.
Lastly, this value might be little endian (so try that too)
With 100 Address i am getting this Error
And With 101 Address i am getting Some Random Value
Ok, the device might be one of those 1 based index addressing.
Could you add another 2 rows to buffer parser...
- Uint16be offset 0, length 2, no multiplier
- Uint16le offset 0, length 2, no multiplier
Show me the debug output & the modbus application values from the same moment in time. In short, I want to see how the node-red data aligns with the modbus app values
Sir , I am getting Integer value as shown in......but this is voltage value so it should be around 240.00V......
I need to also see the values from your modbus application to see if the address registered align. A snapshot of both the values you see in node-red and in the app.
Also, what start address are you using?
As you can see in Modbus Scanner the Holding Register H40100......but in node-red i have to add 101 then Data is coming in some decimal form.......if i use 100 or H40100 then it is showing illegal address........
I realise what you are saying however please indulge me.
Please show a screenshot showing the values sampled at roughly the same time so that I can verify the alignment of addresses.
Sir 99 Address is matching with 101 random value
As i suspected, addressing is off by 1 - this is a common phenomena in Modbus.
So in which case, take the values from Address 99 & it should work.
From address 99, read 4 values
In buffer parser...
- FloatBE offset 0, length 2, no multiplier
- FloatLE offset 0, length 2, no multiplier
inspect these - 1 set will look right, the other will look wrong.
[
{
"id": "b4132d0e1950d012",
"type": "tab",
"label": "Flow 1",
"disabled": false,
"info": "",
"env": []
},
{
"id": "83a85713fa0151bc",
"type": "inject",
"z": "b4132d0e1950d012",
"name": "",
"props": [
{
"p": "payload"
},
{
"p": "topic",
"vt": "str"
}
],
"repeat": "",
"crontab": "",
"once": false,
"onceDelay": 0.1,
"topic": "",
"payload": "",
"payloadType": "date",
"x": 320,
"y": 280,
"wires": [
[
"735e7aca3b0ed1b0"
]
]
},
{
"id": "735e7aca3b0ed1b0",
"type": "function",
"z": "b4132d0e1950d012",
"name": "address:0",
"func": "msg.payload ={\n 'fc':3,\n 'unitid':1,\n 'address':99,\n 'quantity':4\n \n}\nreturn msg;",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 500,
"y": 280,
"wires": [
[
"13260c154cb8689f"
]
]
},
{
"id": "13260c154cb8689f",
"type": "modbus-flex-getter",
"z": "b4132d0e1950d012",
"name": "SPM",
"showStatusActivities": false,
"showErrors": true,
"logIOActivities": false,
"server": "2a0ca9ebcafdd397",
"useIOFile": false,
"ioFile": "",
"useIOForPayload": false,
"emptyMsgOnFail": false,
"keepMsgProperties": false,
"x": 690,
"y": 280,
"wires": [
[
"d3c1b24edad3f5f3"
],
[]
]
},
{
"id": "d3c1b24edad3f5f3",
"type": "buffer-parser",
"z": "b4132d0e1950d012",
"name": "C-1",
"data": "payload",
"dataType": "msg",
"specification": "spec",
"specificationType": "ui",
"items": [
{
"type": "floatbe",
"name": "item3",
"offset": 0,
"length": 2,
"offsetbit": 0,
"scale": "1",
"mask": ""
},
{
"type": "floatle",
"name": "item2",
"offset": 0,
"length": 2,
"offsetbit": 0,
"scale": "1",
"mask": ""
}
],
"swap1": "",
"swap2": "",
"swap3": "",
"swap1Type": "swap",
"swap2Type": "swap",
"swap3Type": "swap",
"msgProperty": "payload",
"msgPropertyType": "str",
"resultType": "value",
"resultTypeType": "output",
"multipleResult": true,
"fanOutMultipleResult": false,
"setTopic": false,
"outputs": 1,
"x": 870,
"y": 280,
"wires": [
[
"43bd8f12eadcd87f"
]
]
},
{
"id": "43bd8f12eadcd87f",
"type": "debug",
"z": "b4132d0e1950d012",
"name": "",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "false",
"statusVal": "",
"statusType": "auto",
"x": 1050,
"y": 280,
"wires": []
},
{
"id": "2a0ca9ebcafdd397",
"type": "modbus-client",
"name": "Secure",
"clienttype": "simpleser",
"bufferCommands": true,
"stateLogEnabled": false,
"queueLogEnabled": false,
"tcpHost": "127.0.0.1",
"tcpPort": "502",
"tcpType": "DEFAULT",
"serialPort": "COM2",
"serialType": "RTU-BUFFERD",
"serialBaudrate": "9600",
"serialDatabits": "8",
"serialStopbits": "1",
"serialParity": "none",
"serialConnectionDelay": "100",
"serialAsciiResponseStartDelimiter": "0x3A",
"unit_id": "1",
"commandDelay": "100",
"clientTimeout": "1000",
"reconnectOnTimeout": true,
"reconnectTimeout": "2000",
"parallelUnitIdsAllowed": true
}
]
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Can you please capture the data coming out of modbud node by adding a debug where shown (set to show complete message) - then, use the "Copy Value" button on the debug tools to capture a full good message.
Dont forget the code formatting.
I cant copy text from a picture.
I asked you to set the debug to show complete message..
and to use the copy value from the debug tools
Dear sir,
I read your old post from below link and my problem solved.....
" Modbus TCP float to value - General - Node-RED Forum (nodered.org)"
Thank you very much for your support.
