verified connector library

Vaisala HMT330 humidity/temp transmitter

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

pointaddress (0-based)typescaleunit
relative_humidity_float0F32LE1%
temperature_float2F32LE1°C
dewpoint_temperature_float6F32LE1°C
dewpoint_frostpoint_temperature_float8F32LE1°C
absolute_humidity_float14F32LE1g/m³
mixing_ratio_float16F32LE1g/kg
wet_bulb_temperature_float18F32LE1°C
humid_air_volume_float20F32LE1ppmV
water_vapor_pressure_float22F32LE1hPa
water_vapor_saturation_pressure_float24F32LE1hPa
enthalpy_float26F32LE1kJ/kg
temperature_difference_float30F32LE1°C
water_vapor_ppm_w_float64F32LE1ppmW
relative_humidity_int256I160.01%
temperature_int257I160.01°C
dewpoint_temperature_int259I160.01°C
dewpoint_frostpoint_temperature_int260I160.01°C
absolute_humidity_int263I160.01g/m³
mixing_ratio_int264I160.01g/kg
wet_bulb_temperature_int265I160.01°C
humid_air_volume_int266I161ppmV
water_vapor_pressure_int267I160.1hPa
water_vapor_saturation_pressure_int268I160.1hPa
enthalpy_int269I160.01kJ/kg
temperature_difference_int271I160.01°C
water_vapor_ppm_w_int288I161ppmW
fault_status512U161
online_status513U161

link settings as documented (unverified): RTU/TCP; baud 300/600/1200/2400/4800/9600/19200/38400/57600/115200; FC 01,02,03,04,05,06,07,08,15,16,22,23,43; Modbus TCP mode accepts only one TCP connection at a time. Serial Modbus interface of the HMT330 does not work with baud rates 115, 150, and 300 b/s.

bench facts as documented (unverified)
terminalsScrew Terminal Block on Motherboard
connectorRJ45 for LAN, RP-SMA for WLAN, optional 8-pin M12 male
isolationRS-485 interface is isolated to 300VDC
shield/groundGrounding screen of electrical cable and grounding connector inside housing
broadcastsupported
protocol notesModbus TCP can process reliably only one Modbus transaction at a time. Reduce the polling rate of the client to avoid nested transactions.
identification notesSupports Device Identification Objects: VendorName (0x00), ProductCode (0x01), MajorMinorVersion (0x02), VendorUrl (0x03), ProductName (0x04), SerialNumber (0x80), CalibrationDate (0x81), CalibrationText (0x82)
FC 43 device IDsupported
power10 ... 35 VDC, 24 VAC (optional power supply module: 100 ... 240 VAC, 50/60 Hz)
environmentOperating temperature range for humidity measurement: -70 ... +180 °C, for transmitter body electronics: -40 ... +60 °C (with display: 0 ... +60 °C)
accuracyAccuracy of analog outputs at 20 °C: ± 0.05 % full scale
certificationsEN61326-1, UL file number E249387
doc revisionM210566EN-K

generated by gemini:gemini-3.5-flash · harvested from https://assets.tequipment.net/assets/1/26/Vaisala_HMT330_Humidity_and_Temperature_Transmitters_Users_Guide.pdf (Vaisala); manual-faithful — the document's claims, panel risk: ELEVATED — panel is not confident; proved interop-verified on 2026-06-10 · recorded 2026-06-10

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