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sofar-KTL-x-request.json
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sofar-KTL-x-request.json
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[
{
"id": "072561a1188f3103",
"type": "subflow",
"name": "sofar KTL-X request",
"info": "TCP modbus request for LSW3 wifi logger \r\nused with Sofar solar KTL-X inverters\r\n\r\n### Outputs\r\n1. JSON data\r\n: payload (object | buffer | string) : parsed data object, raw buffer if can't decode data or error message.\r\n: topic (string) : `decoded data` | `unknown data` | `unexpected data` | `error`.\r\n: debug (object) : debug data object.\r\n: error (object) : error object if there was an error in tcp request node\r\n\r\n2. raw data\r\n: payload (buffer) : raw data frames.\r\n: topic (string) : `raw request` | `raw response`\r\n\r\n### Details\r\n\r\nDefault logger port: \r\n`8899`\r\n\r\nLogger SN: \r\n`17xxxxxxxx`\r\n\r\nDefault first register address in hex: \r\n`0x0000`\r\n\r\nDefault last register address in hex: \r\n`0x0027`\r\n\r\nDefault log level: \r\n`warning`\r\n\r\n### References\r\n\r\n - [GitHub](https://github.com/serek4/node-red-sofar-ktl-x-request) - the node github repository\r\n",
"category": "",
"in": [
{
"x": 120,
"y": 240,
"wires": [
{
"id": "fc59a9b86be541d3"
}
]
}
],
"out": [
{
"x": 1130,
"y": 160,
"wires": [
{
"id": "2af8772ff413b097",
"port": 0
},
{
"id": "2264ac720797774c",
"port": 0
}
]
},
{
"x": 1120,
"y": 280,
"wires": [
{
"id": "fc59a9b86be541d3",
"port": 0
},
{
"id": "41143463e6946012",
"port": 0
}
]
}
],
"env": [
{
"name": "loggerIP",
"type": "str",
"value": "",
"ui": {
"icon": "font-awesome/fa-cloud-download",
"label": {
"en-US": "logger IP"
},
"type": "input",
"opts": {
"types": [
"str",
"env"
]
}
}
},
{
"name": "loggerPort",
"type": "num",
"value": "8899",
"ui": {
"icon": "font-awesome/fa-plug",
"label": {
"en-US": "logger port"
},
"type": "spinner",
"opts": {
"min": 1
}
}
},
{
"name": "loggerSN",
"type": "num",
"value": "1700000000",
"ui": {
"label": {
"en-US": "logger SN"
},
"type": "spinner",
"opts": {
"min": 1700000000,
"max": 1799999999
}
}
},
{
"name": "firstReg",
"type": "str",
"value": "0x0000",
"ui": {
"label": {
"en-US": "first register"
},
"type": "input",
"opts": {
"types": [
"str",
"env"
]
}
}
},
{
"name": "lastReg",
"type": "str",
"value": "0x0027",
"ui": {
"label": {
"en-US": "last register"
},
"type": "input",
"opts": {
"types": [
"str",
"env"
]
}
}
},
{
"name": "logLvl",
"type": "str",
"value": "1",
"ui": {
"label": {
"en-US": "log level"
},
"type": "select",
"opts": {
"opts": [
{
"l": {
"en-US": "disabled"
},
"v": "0"
},
{
"l": {
"en-US": "warning"
},
"v": "1"
},
{
"l": {
"en-US": "info"
},
"v": "2"
},
{
"l": {
"en-US": "debug"
},
"v": "3"
}
]
}
}
}
],
"meta": {
"version": "0.6.0",
"author": "serek4",
"desc": "sofar KTL-X inverter with LSW3 wifi stick",
"license": "MIT"
},
"color": "#20c800",
"outputLabels": [
"JSON data",
"raw data"
],
"icon": "node-red/bridge.svg",
"status": {
"x": 720,
"y": 40,
"wires": [
{
"id": "25689a1f1b08d720",
"port": 0
}
]
}
},
{
"id": "fc59a9b86be541d3",
"type": "function",
"z": "072561a1188f3103",
"name": "request data from inverter",
"func": "/** inverter data modbus request data command in hex\n* a5 |1700 |1045|0000|xxxxxxxx|020000000000000000000000000000|0103 0000 0028 xxxx|xx |15\n* a5 |1700 |1045|0000|xxxxxxxx|020000000000000000000000000000|0103 0105 0010 xxxx|xx |15\n* begin |data length| 2b | 2b | SN | 15b | modbus command |checksum |end\n*/\n\nconst requestNr = flow.get('requestNr') > 255 ? 0 : flow.get('requestNr') || 0;\nconst responseNr = flow.get('responseNr') || 0;\nconst serialNumber = env.get('loggerSN'); // in hex it is 32LE\nconst firstReg = parseInt(env.get('firstReg'), 16);\nconst lastReg = parseInt(env.get('lastReg'), 16);\n\nconst frame = Buffer.alloc(36);\nframe.writeUInt8(0xa5, 0); // frame begin\nframe.writeUInt16BE(0x1700, 1); // data length\nframe.writeUInt16BE(0x1045, 3); // control code\nframe.writeUInt8(requestNr, 5); // request number\nframe.writeUInt8(responseNr, 6); // server response number\nframe.writeUInt32LE(serialNumber, 7); // logger SN\nframe.writeUInt8(0x02, 11); // frame type\nframe.writeUInt16LE(0x0000, 12); // sensor type\nframe.writeUInt32LE(0x0000, 14); // total working time\nframe.writeUInt32LE(0x0000, 18); // power on time\nframe.writeUInt32LE(0x0000, 22); // offset time\n// modbus command\nframe.writeUInt16BE(0x0103, 26) // get data code\n// 1st register range\nframe.writeUInt16BE(firstReg, 28) // first register\nframe.writeUInt16BE(lastReg - firstReg + 1, 30) // number of registers to read\n// 2nd register range\n// frame.writeUInt16BE(0x0105, 28) // reg start\n// frame.writeUInt16BE(0x0010, 30) // number of registers to read\n// crc\nlet commandCrcModbus = crc16modbus(frame.subarray(26, 32)); //! uInt16LE\nframe.writeUInt16LE(commandCrcModbus, 32); //command crc\n\nframe.writeUInt8(frameChecksum(frame), 34); //frame checksum\nframe.writeUInt8(0x15, 35); // frame end\n// node.warn(frame.toString('hex'));\n\nmsg = {\n payload: frame,\n topic: 'raw request'\n};\nflow.set('waitingForResponse', true);\nreturn msg;\n\nfunction frameChecksum(frame) {\n frame = frame.subarray(1, -2);\n let sum = 0x0;\n for (const byte of frame) {\n sum += byte;\n }\n sum = sum % 256;\n return sum;\n}\n",
"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [
{
"var": "crc16modbus",
"module": "crc/crc16modbus"
}
],
"x": 340,
"y": 240,
"wires": [
[
"750e4979aad7f48f"
]
]
},
{
"id": "750e4979aad7f48f",
"type": "tcp request",
"z": "072561a1188f3103",
"name": "Modbus request",
"server": "${loggerIP}",
"port": "${loggerPort}",
"out": "time",
"ret": "buffer",
"splitc": "1000",
"newline": "",
"trim": false,
"tls": "",
"x": 640,
"y": 240,
"wires": [
[
"41143463e6946012",
"b36ae6ac1f32590f"
]
]
},
{
"id": "25689a1f1b08d720",
"type": "status",
"z": "072561a1188f3103",
"name": "",
"scope": [
"750e4979aad7f48f"
],
"x": 580,
"y": 40,
"wires": [
[]
]
},
{
"id": "41143463e6946012",
"type": "change",
"z": "072561a1188f3103",
"name": "",
"rules": [
{
"t": "set",
"p": "topic",
"pt": "msg",
"to": "raw response",
"tot": "str"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 910,
"y": 240,
"wires": [
[]
]
},
{
"id": "2af8772ff413b097",
"type": "function",
"z": "072561a1188f3103",
"name": "decode response",
"func": "let decodedMsg = handleMsg(msg.payload);\ndecodedMsg.debug = msg.debug;\nlet extraMsg = null;\nif (typeof msg.payload.extraData !== \"undefined\") {\n if (isFrameValid(msg.payload.extraData)) {\n log(\"info\", \"decoding extra data\");\n if (decodedMsg.topic !== \"decoded data\") { flow.set(\"waitingForResponse\", true); }\n extraMsg = handleMsg(msg.payload.extraData);\n }\n}\nreturn [[decodedMsg, extraMsg]];\n\nfunction handleMsg(input) {\n const message = { payload: null };\n if (isFrameValid(input)) {\n message.payload = decodeData(input.data); // decode response data\n } else { log(\"warn\", \"invalid data, skipping decoding\"); }\n if (message.payload !== null) {\n flow.set(\"waitingForResponse\", false);\n message.topic = \"decoded data\";\n } else { // decode failed send raw buffer\n message.payload = input.data;\n if (!flow.get(\"waitingForResponse\")) {\n message.topic = \"unexpected data\";\n } else {\n flow.set(\"waitingForResponse\", false);\n message.topic = \"unknown data\";\n }\n }\n return message;\n}\n\nfunction isFrameValid(frame) {\n return frame.isValidV5frame && frame.frameChecksum === \"OK\" && frame.data.modbusFrameCrc === \"OK\";\n}\n\nfunction decodeData(inputBuffer) { // real time data(Function Code 0x03) response\n const data = {};\n try {\n const solarman = inputBuffer.solarmanHeader;\n\n const modbusBuffer = inputBuffer.modbusFrame;\n const registersDataLength = modbusBuffer[2]; // first 3 bytes are slave address, function code, data length\n const modbusRegisters = modbusBuffer.subarray(3, 3 + registersDataLength); // registers data begins at 3rd byte\n\n // inverter status\n data.inverterStatus = decodeInverterStatus(modbusRegisters.readUInt16BE(0x00));\n //errors\n data.errors = errorDecoder(modbusRegisters.subarray(0x01 * 2, 0x06 * 2));\n\n //PV Input Message\n data.PV = {};\n data.PV.string1 = {};\n data.PV.string1.voltage = modbusRegisters.readUInt16BE(0x06 * 2) / 10; // V\n data.PV.string1.current = modbusRegisters.readInt16BE(0x07 * 2) / 100; // A\n data.PV.string1.power = modbusRegisters.readUInt16BE(0x0a * 2) * 10; // W (/ 100 -> kW)\n data.PV.string2 = {};\n data.PV.string2.voltage = modbusRegisters.readUInt16BE(0x08 * 2) / 10; // V\n data.PV.string2.current = modbusRegisters.readInt16BE(0x09 * 2) / 100; // A\n data.PV.string2.power = modbusRegisters.readUInt16BE(0x0b * 2) * 10; // W (/ 100 -> kW)\n log(\"debug\", \"PV Input data successfully decoded\");\n\n // Output Grid Message\n data.grid = {};\n data.grid.activePower = modbusRegisters.readUInt16BE(0x0c * 2) * 10; // W (/ 100 -> kW)\n data.grid.reactivePower = modbusRegisters.readInt16BE(0x0d * 2) / 100; // kVar\n data.grid.frequency = modbusRegisters.readUInt16BE(0x0e * 2) / 100; // Hz\n data.grid.L1_V = modbusRegisters.readUInt16BE(0x0f * 2) / 10; // V\n data.grid.L1_A = modbusRegisters.readUInt16BE(0x10 * 2) / 100; // A\n data.grid.L2_V = modbusRegisters.readUInt16BE(0x11 * 2) / 10; // V\n data.grid.L2_A = modbusRegisters.readUInt16BE(0x12 * 2) / 100; // A\n data.grid.L3_V = modbusRegisters.readUInt16BE(0x13 * 2) / 10; // V\n data.grid.L3_A = modbusRegisters.readUInt16BE(0x14 * 2) / 100; // A\n log(\"debug\", \"Output Grid data successfully decoded\");\n\n // Inverter Generation message\n data.production = {};\n data.production.TotalEnergy = modbusRegisters.readUInt32BE(0x15 * 2); // kW\n data.production.TotalTime = modbusRegisters.readUInt32BE(0x17 * 2); // hours\n data.production.TodayEnergy = modbusRegisters.readUInt16BE(0x19 * 2) / 100; // kW (* 10 -> W)\n data.production.TodayTime = modbusRegisters.readUInt16BE(0x1a * 2); // minutes\n log(\"debug\", \"Inverter Generation data successfully decoded\");\n\n // Inverter inner message\n data.info = {};\n data.info.loggerTemp = modbusRegisters.readInt16BE(0x1b * 2); // °C\n data.info.inverterTemp = modbusRegisters.readInt16BE(0x1c * 2); // °C\n data.info.Vbus = modbusRegisters.readUInt16BE(0x1d * 2) / 10; // V\n data.info.PV1VCPU = modbusRegisters.readUInt16BE(0x1e * 2) / 10; // V\n data.info.PV1ACPU = modbusRegisters.readUInt16BE(0x1f * 2) / 100; // A\n data.info.countdownTime = modbusRegisters.readUInt16BE(0x20 * 2); // seconds\n data.info.inverterAlarmInfo = modbusRegisters.readUInt16BE(0x21 * 2);\n data.info.inputMode = inputModeDecoder(modbusRegisters.readUInt16BE(0x22 * 2));\n data.info.inverterInnerInfo = modbusRegisters.readUInt16BE(0x23 * 2);\n data.info.PV1insulationResistance = modbusRegisters.readUInt16BE(0x24 * 2); // kOhm\n data.info.PV2insulationResistance = modbusRegisters.readUInt16BE(0x25 * 2); // kOhm\n data.info.cathode_groundInsulationImpedance = modbusRegisters.readUInt16BE(0x26 * 2); // KOhm\n data.info.country = countryDecoder(modbusRegisters.readUInt16BE(0x27 * 2));\n log(\"debug\", \"Inverter inner data successfully decoded\");\n\n // data from solarman frame header\n data.loggerInfo = {};\n data.loggerInfo.frameType = solarman.readUint8(0x00);\n data.loggerInfo.dataType = solarman.readUint8(0x01);\n data.loggerInfo.totalWorkingTime = solarman.readUInt32LE(0x02); // seconds\n data.loggerInfo.powerOnTime = solarman.readUInt32LE(0x06); // seconds\n data.loggerInfo.offsetTime = solarman.readUInt32LE(0x0A); // seconds\n data.loggerInfo.totalOperationTime = data.loggerInfo.totalWorkingTime - data.loggerInfo.powerOnTime; // seconds\n log(\"debug\", \"solarman frame header successfully decoded\");\n\n data.timestamp = data.loggerInfo.totalWorkingTime + data.loggerInfo.offsetTime; // timestamp in seconds\n log(\"info\", \"data successfully decoded\");\n } catch (error) {\n // node.warn(error);\n log(\"warn\", \"decode data failed\");\n return null;\n };\n\n return data;\n}\n\nfunction decodeInverterStatus(status) {\n switch (status) {\n case 0x00:\n return `standby`;\n case 0x02:\n return `normal`;\n case 0x03:\n return `fault`;\n case 0x04:\n return `permanent`;\n\n default:\n return `0x${`0${(status.toString(16))}`.slice(-2)}`;\n }\n}\n\nfunction inputModeDecoder(mode) {\n switch (mode) {\n case 0x00:\n return 'parallel';\n case 0x01:\n return 'independent';\n\n default:\n return `0x${`0${(mode.toString(16))}`.slice(-2)}`;\n }\n}\n\nfunction countryDecoder(countryCode) {\n switch (countryCode) {\n case 0:\n return \"Germany VDE AR-N4105\";\n case 1:\n return \"Italy CE10-21\";\n case 2:\n return \"Australia\";\n case 3:\n return \"Spain RD1699\";\n case 4:\n return \"Turkey\";\n case 5:\n return \"Denmark\";\n case 6:\n return \"Greece Continent\";\n case 7:\n return \"Netherland\";\n case 8:\n return \"Belgium\";\n case 9:\n return \"UK-G59\";\n case 10:\n return \"China\";\n case 11:\n return \"France\";\n case 12:\n return \"Poland\";\n case 13:\n return \"Germany BDEW\";\n case 14:\n return \"Germany VDE 0126\";\n case 15:\n return \"Italy CE10-16\";\n case 16:\n return \"UK-G83\";\n case 17:\n return \"Greece Island\";\n case 18:\n return \"EU EN50438\";\n case 19:\n return \"IEC EN61727\";\n case 20:\n return \"Korea\";\n case 21:\n return \"Sweden\";\n case 22:\n return \"Europe General\";\n case 23:\n return \"CE10-21 External\";\n case 24:\n return \"Cyprus\";\n case 25:\n return \"India\";\n case 26:\n return \"Philippines\";\n case 27:\n return \"New Zealand\";\n case 28:\n return \"Brazil\";\n case 29:\n return \"Slovakia VSD\";\n case 30:\n return \"Slovakia SSE\";\n case 31:\n return \"Slovakia ZSD\";\n case 32:\n return \"CE10-21 In Areti\";\n default:\n return `Unknown code: ${countryCode}`;\n\n }\n}\n/**\n * read faults(5) every fault is UInt16BE\n * every bit in fault is an error if bit = 1, 16 errors in one fault\n * @param {Buffer} errorBuffer 5 faults 2bytes each = 10bytes long buffer\n * @return array of errors\n */\nfunction errorDecoder(errorBuffer) { // 10bytes in hex\n const errors = [\n [\n \"ID09 - PVOVP(PV Over Voltage Protection)\",\n \"ID10 - IpvUnbalance(PV Input Current Unbalance)\",\n \"ID11 - PvConfigSetWrong(PV Input Mode Configure wrong)\",\n \"ID12 - GFCIFault(Ground - Fault circuit interrupters Fault)\",\n \"ID13 - PhaseSequenceFault(Phase sequence Fault)\",\n \"ID14 - HwBoostOCP(hardware boost over current protection)\",\n \"ID15 - HwAcOCP(Hardware AC over current protection)\",\n \"ID16 - AcRmsOCP(The Grid current is too high)\",\n ], [\n \"ID01 - GridOVP(grid over voltage protection)\",\n \"ID02 - GridUVP(grid under voltage protection)\",\n \"ID03 - GridOFP(grid over frequency protection)\",\n \"ID04 - GridUFP(grid under frequency protection)\",\n \"ID05 - PVUVP(PV Under Voltage Protection)\",\n \"ID06 - GridLVRT(Grid Low Voltage Ride through)\",\n \"ID07 - reserved\",\n \"ID08 - reserved\",\n ], [\n \"ID25 - BusUVP(Bus under voltage protection)\",\n \"ID26 - BusOVP(Bus over voltage protection)\",\n \"ID27 - VbusUnbalance(Bus voltage unbalance)\",\n \"ID28 - DciOCP(The DCI is too high)\",\n \"ID29 - SwOCPInstant(The Grid current is too high)\",\n \"ID30 - SwBOCPInstant(The input current is too high)\",\n \"ID31 - reserved\",\n \"ID32 - reserved\",\n ], [\n \"ID17 - HwADFaultIGrid(The Grid current sampling is error)\",\n \"ID18 - HwADFaultDCI(The DCI sampling is error)\",\n \"ID19 - HwADFaultVGrid(The Grid voltage sampling is error)\",\n \"ID20 - GFCIDeviceFault(GFCI device sampling is error)\",\n \"ID21 - MChip_Fault(Main chip fault)\",\n \"ID22 - HwAuxPowerFault(Hardware auxiliary power fault)\",\n \"ID23 - BusVoltZeroFault(Bus voltage zero fault)\",\n \"ID24 - IacRmsUnbalance(The output current is not balanced)\",\n ], [\n \"ID41\",\n \"ID42\",\n \"ID43\",\n \"ID44\",\n \"ID45\",\n \"ID46\",\n \"ID47\",\n \"ID48\",\n ], [\n \"ID33\",\n \"ID34\",\n \"ID35\",\n \"ID36\",\n \"ID37\",\n \"ID38\",\n \"ID39\",\n \"ID40\",\n ], [\n \"ID57 - OverTempFault_Inv(The inverter temp is too high)\",\n \"ID58 - OverTempFault_Boost(The boost temp is too high)\",\n \"ID59 - OverTempFault_Env(The environment temp is too high)\",\n \"ID60 - PEConnectFault(The inverter is not connect the PE wire)\",\n \"ID61 - reserved\",\n \"ID62 - reserved\",\n \"ID63 - reserved\",\n \"ID64 - reserved\",\n\n ], [\n \"ID49 - ConsistentFault_VGrid(The grid voltage sampling value between the master and slave DSP is Vary widely)\",\n \"ID50 - ConsistentFault_FGrid(The grid frequency sampling value between the master and slave DSP is Vary widely)\",\n \"ID51 - ConsistentFault_DC(The DCI sampling value between the master and slave DSP is Vary widely)\",\n \"ID52 - ConsistentFault_GFCI(The GFCI sampling value between the master and slave DSP is Vary widely)\",\n \"ID53 - SpiCommLose(The communication between the master and slave DSP is fail)\",\n \"ID54 - SciCommLose(The communication between the slave and communication board is fail)\",\n \"ID55 - RelayTestFail(The relay is faulty)\",\n \"ID56 - PvIsoFault(The insulation resistance between the PV array and the earth is too low)\",\n\n ], [\n \"ID73 - reserved\",\n \"ID74 - unrecoverIPVInstant(The input current is too high.and has cause unrecoverable fault)\",\n \"ID75 - unrecoverWRITEEEPROM(The EEPROM is faulty)\",\n \"ID76 - unrecoverREADEEPROM(The EEPROM is faulty)\",\n \"ID77 - unrecoverRelayFail(The relay is faulty, and has cause unrecoverable fault)\",\n \"ID78 - reserved\",\n \"ID79 - reserved\",\n \"ID80 - reserved\",\n ], [\n \"ID65 - unrecoverHwAcOCP(The grid current is too high,and has cause unrecoverable fault)\",\n \"ID66 - unrecoverBusOVP(The bus voltage is too high,and has cause unrecoverable fault)\",\n \"ID67 - unrecoverIacRmsUnbalance(The grid current is unbalance,and has cause unrecoverable fault)\",\n \"ID68 - unrecoverIpvUnbalance(The input current is unbalance,and has cause unrecoverable fault)\",\n \"ID69 - unrecoverVbusUnbalance(The bus voltage is unbalance,and has cause unrecoverable fault)\",\n \"ID70 - unrecoverOCPInstant(The grid current is too high,and has cause unrecoverable fault)\",\n \"ID71 - unrecoverPvConfigSetWrong(PV Input Mode Configure wrong,and has cause unrecoverable fault)\",\n \"ID72 - reserved\",\n\n ],\n ];\n let currentErrors = [];\n for (let byteNr = 0; byteNr < errorBuffer.length / 2; byteNr += 2) {\n const faultBuffer = errorBuffer.subarray(byteNr, byteNr + 2);\n for (let faultByte = 0; faultByte < faultBuffer.length; faultByte++) {\n const byteData = faultBuffer.readUint8(faultByte);\n const byteDataStr = `0000000${byteData.toString(2)}`.slice(-8); // byte data 8 bits string\n let bitArray = Array.from(byteDataStr, x => Number.parseInt(x, 2));\n bitArray.reverse(); // flip array so bit 0 is @ bitArray[0]\n let bitErrors = errors[byteNr + faultByte].filter((element, index) => {\n return bitArray[index] == 1;\n });\n currentErrors.push(bitErrors);\n }\n }\n return currentErrors.flat();\n\n}\n\nfunction log(level, message) {\n switch (level) {\n case \"warn\":\n if (env.get(\"logLvl\") >= 1) { node.warn(\"[w] \" + message); }\n break;\n case \"info\":\n if (env.get(\"logLvl\") >= 2) { node.log(\"[i] \" + message); }\n break;\n case \"debug\":\n if (env.get(\"logLvl\") >= 3) { node.log(\"[d] \" + message); }\n break;\n }\n}\n",
"outputs": 1,
"timeout": "",
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"initialize": "",
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{
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"type": "function",
"z": "072561a1188f3103",
"name": "decode header",
"func": "if (typeof msg.debug === 'undefined') { msg.debug = {} };\nmsg.debug.header = decodeHeader(msg.payload.header);\nflow.set('requestNr', (msg.debug.header.requestNr >= 255) ? 1 : (msg.debug.header.requestNr + 1));\nflow.set('responseNr', msg.debug.header.responseNr);\nreturn msg;\n\nfunction decodeHeader(buffer) {\n const header = {};\n header.dataLength = buffer.readUInt16LE(1);\n header.requestNr = buffer.readUInt8(5);\n header.responseNr = buffer.readUInt8(6);\n header.loggerSN = buffer.readUInt32LE(7);\n return header;\n}\n",
"outputs": 1,
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{
"id": "b36ae6ac1f32590f",
"type": "function",
"z": "072561a1188f3103",
"name": "check frame",
"func": "msg.payload = checkFrame(msg.payload);\nmsg.debug = {};\nmsg.debug.frame = msg.payload;\nmsg.topic = \"frame\";\nmsg.timestamp = Date.now(); // timestamp in ms\nreturn msg;\n\nfunction checkFrame(frameBuffer) {\n log(\"debug\", `checking frame buffer(${frameBuffer.length})`);\n const headerSize = 11;\n const footerSize = 2;\n if (frameBuffer.length < (headerSize + footerSize)) {\n log(\"warn\", `response frame too short(got: ${frameBuffer.length}, minimum: ${headerSize + footerSize})`);\n return frameBuffer;\n }\n const frame = {};\n const frameDataLength = frameBuffer.readUInt16LE(1);\n const calculatedLength = headerSize + frameDataLength + footerSize;\n if (frameBuffer.length > calculatedLength) {\n if (frameBuffer[calculatedLength - 1] === 0x15) {\n frame.length = calculatedLength;\n log(\"warn\", `extra data after frame end(${frame.length}), +${frameBuffer.length - calculatedLength})`);\n frame.extraData = checkFrame(frameBuffer.subarray(calculatedLength));\n } else {\n log(\"warn\", `frame longer than expected(got: ${frame.length}, expected: ${calculatedLength})`);\n frame.length = frameBuffer.length;\n }\n } else if (frameBuffer.length < calculatedLength) {\n log(\"warn\", `frame shorter than expected(got: ${frame.length}, expected: ${calculatedLength})`);\n frame.length = frameBuffer.length;\n } else {\n log(\"info\", `frame length OK(${calculatedLength})`);\n frame.length = calculatedLength;\n }\n frame.isValidV5frame = frameBuffer[0] === 0xA5 && frameBuffer[frame.length - 1] === 0x15;\n if (!frame.isValidV5frame) { log(\"warn\", \"invalid V5 frame\"); }\n else { log(\"info\", \"valid V5 frame\"); }\n const calculatedChecksum = frameChecksum(frameBuffer, frame.length);\n const checksum = frameBuffer.readUInt8(frame.length - footerSize);\n const data = frameBuffer.subarray(headerSize, frame.length - footerSize);\n if (calculatedChecksum === checksum) {\n frame.frameChecksum = \"OK\";\n log(\"info\", \"frame checksum OK\");\n } else {\n frame.frameChecksum = \"mismatch\";\n log(\"warn\", \"frame checksum mismatch\");\n }\n frame.buffer = frameBuffer;\n frame.header = frameBuffer.subarray(0, 11);\n frame.data = checkData(data);\n frame.footer = frameBuffer.subarray(frame.length - 2, frame.length);\n frame.timestamp = Math.floor(Date.now() / 1000); // unixtimestamp in seconds\n return frame;\n}\n\nfunction frameChecksum(frame, length) {\n frame = frame.subarray(1, length - 2);\n let sum = 0x0;\n for (const byte of frame) {\n sum += byte;\n }\n sum = sum % 256;\n return sum;\n}\n\nfunction checkData(dataBuffer) {\n log(\"debug\", `checking data buffer(${dataBuffer.length})`);\n const solarmanHeaderLength = 14;\n if (dataBuffer.length >= solarmanHeaderLength) {\n const data = {};\n data.solarmanHeader = dataBuffer.subarray(0, solarmanHeaderLength);\n if (dataBuffer.length === solarmanHeaderLength) {\n log(\"warn\", \"frame data empty\");\n return data\n }\n log(\"debug\", \"data buffer OK\");\n data.modbusFrame = dataBuffer.subarray(solarmanHeaderLength);\n data.modbusFrameCrc = checkModbusFrame(data.modbusFrame);\n return data;\n } else if (dataBuffer.length === 1 && dataBuffer[0] === 0x00) {\n log(\"warn\", \"null data\");\n return dataBuffer\n } else {\n log(\"warn\", `data too short(got: ${dataBuffer.length}, minimum: ${solarmanHeaderLength})`);\n return dataBuffer\n }\n}\n\nfunction checkModbusFrame(frame) {\n log(\"debug\", `checking modbus frame(${frame.length})`);\n let modbusFrameCrc = undefined;\n const headerLength = 3; // first 3 bytes are: slave address, function code, data length\n const crcLength = 2; // int 16 LE\n if (frame.length >= (headerLength + crcLength)) {\n const calculatedCrc = crc16modbus(frame.subarray(0, frame.length - crcLength));\n const crc = frame.readUInt16LE(frame.length - crcLength);\n if (calculatedCrc === crc) {\n modbusFrameCrc = \"OK\";\n log(\"info\", \"modbus frame crc OK\");\n const registersDataLength = frame[2]; // data length\n const calculatedDataLength = frame.length - (headerLength + crcLength);\n if (frame.length === (headerLength + crcLength)) {\n log(\"warn\", \"modbus frame data empty\");\n } else if (registersDataLength !== calculatedDataLength) {\n log(\"warn\", `wrong modbus registers data length(got: ${calculatedDataLength}, expected: ${registersDataLength})`);\n } else {\n log(\"debug\", `modbus registers data length OK(${registersDataLength})`);\n }\n } else {\n modbusFrameCrc = \"mismatch\";\n log(\"warn\", \"modbus frame crc mismatch\");\n }\n } else {\n log(\"warn\", `modbus frame too short(got: ${frame.length}, minimum: ${headerLength + crcLength})`);\n }\n return modbusFrameCrc;\n}\n\nfunction log(level, message) {\n switch (level) {\n case \"warn\":\n if (env.get(\"logLvl\") >= 1) { node.warn(\"[w] \" + message); }\n break;\n case \"info\":\n if (env.get(\"logLvl\") >= 2) { node.log(\"[i] \" + message); }\n break;\n case \"debug\":\n if (env.get(\"logLvl\") >= 3) { node.log(\"[d] \" + message); }\n break;\n }\n}\n",
"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [
{
"var": "crc16modbus",
"module": "crc/crc16modbus"
}
],
"x": 410,
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"outputLabels": [
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{
"id": "2264ac720797774c",
"type": "change",
"z": "072561a1188f3103",
"name": "",
"rules": [
{
"t": "set",
"p": "payload",
"pt": "msg",
"to": "error.message",
"tot": "msg"
},
{
"t": "set",
"p": "topic",
"pt": "msg",
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"tot": "str"
}
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"action": "",
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"reg": false,
"x": 900,
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"wires": [
[]
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},
{
"id": "a69591f381e80034",
"type": "catch",
"z": "072561a1188f3103",
"name": "modbus request errors",
"scope": [
"750e4979aad7f48f"
],
"uncaught": false,
"x": 620,
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