Hello everyone,
I need help with the following issue.
I am trying to read data from a Modbus (RTU) electricity meter with a Raspberry Pi.
So far everything is working fine, I can read almost all values, but I am having problems with the data that starts with high byte 4. I cannot read this data.
Parser nodes are not helpful here, I can display or put the data together, the problem starts earlier when I trying to read from the meter.
Can anyone tell me how I can pass the register addresses to the Modbus node so that I can read the correct data?
In the pictures you can see the extract from the Modbus protocol, I am trying to read the data point (Total import active energy - kWh) that I have marked in red.
This is the first one that starts with high byte = 04. I can read all the data before that without any problems because I specify the address from the low byte.
If anyone can help me to solve this, I would be very grateful.
Here is my flow:
[
{
"id": "ff75782aa08979e0",
"type": "tab",
"label": "SolarEnergy",
"disabled": true,
"info": "",
"env": []
},
{
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"type": "calculator",
"z": "ff75782aa08979e0",
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"inputMsgField": "payload",
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"operation": "div",
"constant": "100",
"round": true,
"truncate": false,
"decimals": "1",
"decimals2": "0",
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"pt": "msg",
"to": "payload[1]",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 830,
"y": 140,
"wires": [
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{
"id": "98f3b2ce4b960396",
"type": "modbus-flex-getter",
"z": "ff75782aa08979e0",
"name": "",
"showStatusActivities": false,
"showErrors": false,
"showWarnings": true,
"logIOActivities": false,
"server": "962209853e7d677b",
"useIOFile": false,
"ioFile": "",
"useIOForPayload": false,
"emptyMsgOnFail": false,
"keepMsgProperties": false,
"delayOnStart": false,
"startDelayTime": "",
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[]
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"z": "ff75782aa08979e0",
"name": "U L1-N",
"props": [
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"p": "payload.fc",
"v": "3",
"vt": "num"
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{
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"v": "0",
"vt": "str"
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{
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"v": "2",
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"vt": "str"
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{
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{
"t": "eq",
"v": "U L2-N",
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{
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{
"t": "eq",
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{
"t": "eq",
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{
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{
"t": "eq",
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{
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{
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{
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"checkall": "true",
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"v": "3",
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{
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{
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{
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"vt": "str"
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{
"p": "payload.quantity",
"v": "1",
"vt": "str"
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{
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"showErrors": false,
"showWarnings": true,
"showLogs": true
}
]
