PCP usw. habe ich hier im Forum gefunden. Da sind die Begriffe ja ganz gut erklärt.
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#Axpert Commands and examples
#Q1 # Undocumented command: LocalInverterStatus (seconds from absorb), ParaExistInfo (seconds from end of Float), SccOkFlag, AllowSccOnFlag, ChargeAverageCurrent, SCC PWM Temperature, Inverter Temperature, Battery Temperature, Transformer Temperature, GPDAT, FanLockStatus, FanPWMDuty, FanPWM, SCCChargePowerWatts, ParaWarning, SYNFreq, InverterChargeStatus
#QPI # Device protocol ID inquiry
#QID # The device serial number inquiry
#QVFW # Main CPU Firmware version inquiry
#QVFW2 # Another CPU Firmware version inquiry
#QFLAG # Device flag status inquiry
#QPIGS # Device general status parameters inquiry
# GridVoltage, GridFrequency, OutputVoltage, OutputFrequency, OutputApparentPower, OutputActivePower, OutputLoadPercent, BusVoltage, BatteryVoltage, BatteryChargingCurrent, BatteryCapacity, InverterHeatSinkTemperature, PV-InputCurrentForBattery, PV-InputVoltage, BatteryVoltageFromSCC, BatteryDischargeCurrent, DeviceStatus,
#QMOD # Device mode inquiry P: PowerOnMode, S: StandbyMode, L: LineMode, B: BatteryMode, F: FaultMode, H: PowerSavingMode
#QPIWS # Device warning status inquiry: Reserved, InverterFault, BusOver, BusUnder, BusSoftFail, LineFail, OPVShort, InverterVoltageTooLow, InverterVoltageTooHIGH, OverTemperature, FanLocked, BatteryVoltageHigh, BatteryLowAlarm, Reserved, ButteryUnderShutdown, Reserved, OverLoad, EEPROMFault, InverterSoftFail, SelfTestFail, OPDCVoltageOver, BatOpen, CurrentSensorFail, BatteryShort, PowerLimit, PVVoltageHigh, MPPTOverloadFault, MPPTOverloadWarning, BatteryTooLowToCharge, Reserved, Reserved
#QDI # The default setting value information
#QMCHGCR # Enquiry selectable value about max charging current
#QMUCHGCR # Enquiry selectable value about max utility charging current
#QBOOT # Enquiry DSP has bootstrap or not
#QOPM # Enquiry output mode
#QPIRI # Device rating information inquiry - nefunguje
#QPGS0 # Parallel information inquiry
# TheParallelNumber, SerialNumber, WorkMode, FaultCode, GridVoltage, GridFrequency, OutputVoltage, OutputFrequency, OutputAparentPower, OutputActivePower, LoadPercentage, BatteryVoltage, BatteryChargingCurrent, BatteryCapacity, PV-InputVoltage, TotalChargingCurrent, Total-AC-OutputApparentPower, Total-AC-OutputActivePower, Total-AC-OutputPercentage, InverterStatus, OutputMode, ChargerSourcePriority, MaxChargeCurrent, MaxChargerRange, Max-AC-ChargerCurrent, PV-InputCurrentForBattery, BatteryDischargeCurrent
#QBV # Compensated Voltage, SoC
#PEXXX # Setting some status enable
#PDXXX # Setting some status disable
#PF # Setting control parameter to default value
#FXX # Setting device output rating frequency
#POP02 # set to SBU
#POP01 # set to Solar First
#POP00 # Set to UTILITY
#PBCVXX_X # Set battery re-charge voltage
#PBDVXX_X # Set battery re-discharge voltage
#PCP00 # Setting device charger priority: Utility First
#PCP01 # Setting device charger priority: Solar First
#PCP02 # Setting device charger priority: Solar and Utility
#PGRXX # Setting device grid working range
#PBTXX # Setting battery type
#PSDVXX_X # Setting battery cut-off voltage
#PCVVXX_X # Setting battery C.V. charging voltage
#PBFTXX_X # Setting battery float charging voltage
#PPVOCKCX # Setting PV OK condition
#PSPBX # Setting solar power balance
#MCHGC0XX # Setting max charging Current M XX
#MUCHGC002 # Setting utility max charging current 0 02
#MUCHGC010 # Setting utility max charging current 0 10
#MUCHGC020 # Setting utility max charging current 0 20
#MUCHGC030 # Setting utility max charging current 0 30
#POPMMX # Set output mode M 0:single, 1: parrallel, 2: PH1, 3: PH2, 4: PH3
#notworking
#PPCP000 # Setting parallel device charger priority: UtilityFirst - notworking
#PPCP001 # Setting parallel device charger priority: SolarFirst - notworking
#PPCP002 # Setting parallel device charger priority: OnlySolarCharging - notworking
#notworking, ganz unten, stimmt nicht. Bei mir funktionieren die Befehle PPCP000, PPCP001, PPCP002. PCP003 gibt es auch noch.
Etwas schwierig war nur herauszufinden welcher Befehl den nun wirklich welche Einstellung am Gerät verändert. Da ist die Beschreibung manchmal nicht ganz eindeutig. Das habe ich dann durch probieren herausgefunden. Die Befehle die ich in dem Node-Red Json-File benutze habe ich ja durch die Kommentare erklärt und verweise ja noch sogar auf die Programm-Nummern im Steca-Manual.
Bzgl- deines Datenmülls. Da kann ich dir nicht weiterhelfen. Was mir aber noch aufgefallen ist, ist das ich die Nutzdaten in Node-Red als String und nicht als Zahl eingeben muß. Vielleicht hängt das damit zusammen.