--- title: "Gill Instruments MaxiMet Weather Stations | Aethair" description: "Gill Instruments MaxiMet: 16 models in the Aethair sensor catalog, connected through Thiamis. Gill MaxiMet GMX-series compact ultrasonic weather stations.…" url: https://aethair.io/sensors/gill-instruments-weather-stations/ --- Sensors · Weather Stations # Gill Instruments MaxiMet Weather Stations Gill MaxiMet GMX-series compact ultrasonic weather stations. Each model carries a different subset of ultrasonic wind, barometric pressure, temperature, humidity, dew point, and solar radiation, with higher models adding precipitation, GPS, compass, or heat-stress features. [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Build a Configuration](https://aethair.io/build/?params=temperature,humidity,pressure,dew_point,wind_speed,wind_direction,solar_radiation) At a glance **7** parameters **16** models [**Connects via Thiamis** RS-232 · ASCII](https://aethair.io/products/thiamis/) Measures ## What the Gill Instruments MaxiMet Measures 7 parameters, each linked to its page: the sensors, units, and standards behind it. [Air Temperature °C](https://aethair.io/parameters/temperature/) [Relative Humidity %](https://aethair.io/parameters/humidity/) [Barometric Pressure hPa](https://aethair.io/parameters/pressure/) [Dew Point °C](https://aethair.io/parameters/dew_point/) [Wind Speed m/s](https://aethair.io/parameters/wind_speed/) [Wind Direction °](https://aethair.io/parameters/wind_direction/) [Solar / Global Radiation W/m²](https://aethair.io/parameters/solar_radiation/) [Connects via **Thiamis**](https://aethair.io/products/thiamis/) Wired interface [RS-232 ASCII](https://aethair.io/products/thiamis/#port-rs232) Models ## Gill Instruments MaxiMet Models 16 models, each with what it measures and the ranges its datasheet gives. | Model | Description | Measures & specs | | - | - | - | | **MaxiMet-GMX100** | Compact PTU (pressure, temperature, humidity) unit: barometric pressure, air temperature, relative humidity, and derived dew point; no wind. Discontinued by Gill; retained for installed-base support. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) | | **MaxiMet-GMX200** | Ultrasonic wind speed and direction only, with electronic compass and optional GPS. | [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX240** | Ultrasonic wind speed and direction with an integrated optical rain sensor and optional GPS; no PTU. | [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX260** | MaxiMet Marine: ultrasonic wind speed and direction only, in an IP68 housing with 6-axis compass and optional GPS. | [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX300** | Pressure, temperature, humidity, and derived dew point (PTU); no wind or solar. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) | | **MaxiMet-GMX301** | GMX300 PTU set plus solar radiation; no wind. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Solar / Global Radiation](https://aethair.io/parameters/solar_radiation/) | | **MaxiMet-GMX400** | Pressure, temperature, humidity, and derived dew point with an integrated optical rain sensor; no wind. (Gill redefined the GMX400; earlier units were a wind/GPS station.) | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) | | **MaxiMet-GMX500** | Ultrasonic wind plus PTU and derived dew point, with electronic compass and optional GPS and heating. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX501** | GMX500 wind + PTU set plus solar radiation. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) [Solar / Global Radiation](https://aethair.io/parameters/solar_radiation/) | | **MaxiMet-GMX531** | Wind, PTU, derived dew point, and solar radiation with a remote tipping-bucket rain gauge input. Superseded by the GMX551. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) [Solar / Global Radiation](https://aethair.io/parameters/solar_radiation/) | | **MaxiMet-GMX550** | Ultrasonic wind plus PTU and derived dew point with a remote tipping-bucket rain gauge connector; optional GPS and heating. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX551** | Wind, PTU, derived dew point, and solar radiation with a remote tipping-bucket rain gauge connector. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) [Solar / Global Radiation](https://aethair.io/parameters/solar_radiation/) | | **MaxiMet-GMX552** | Ultrasonic wind plus PTU and derived dew point with on-board heat-stress measurement (black-globe temperature and WBGT). | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX560** | MaxiMet Marine: ultrasonic wind plus PTU and derived dew point in an IP68 housing with 6-axis compass; optional GPS and heating. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX600** | Ultrasonic wind plus PTU and derived dew point with an integrated optical rain sensor and electronic compass; optional GPS and heating. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | | **MaxiMet-GMX603** | Ultrasonic wind plus PTU and derived dew point with an improved integrated optical present-weather rain sensor; optional GPS and heating. | [Air Temperature](https://aethair.io/parameters/temperature/) [Relative Humidity](https://aethair.io/parameters/humidity/) [Barometric Pressure](https://aethair.io/parameters/pressure/) [Dew Point](https://aethair.io/parameters/dew_point/) [Wind Speed](https://aethair.io/parameters/wind_speed/) [Wind Direction](https://aethair.io/parameters/wind_direction/) | Solutions ## Where the Gill Instruments MaxiMet Is Used Solutions whose recommended configuration uses this instrument or whose standards it is built to, followed by solutions whose core panel it partly measures. ### [Weather Stations & Meteorology](https://aethair.io/solutions/weather/) Professional multi-parameter weather monitoring On the platform ## What the Gill Instruments MaxiMet Gets From Aethair Connected through Thiamis, its readings arrive in the same Environet account as Aethair's own monitors. ### [Live data and alerts](https://aethair.io/platform/environet/) [Environet](https://aethair.io/platform/environet/) shows the instrument live and alerts the people you choose by email, SMS, and webhook, at the thresholds you set. [Noesis](https://aethair.io/platform/noesis/) sets up a dashboard, a report, or an alert from a plain-text request. ### [Compliance reports](https://aethair.io/platform/reports/) [Aethair Reports](https://aethair.io/platform/reports/) produces scheduled or on-demand reports from the instrument's readings, as a PDF or secure link. Templates cover Aethair Blue, WELL v2, cabin air (ISO 23875), and the CMS-2567 healthcare codebook (ASHRAE 170), or you can report against custom limits such as OSHA PELs, NAAQS, EPA guidance, or your own program limits. ### [Dashboards and the app](https://aethair.io/platform/dashboards/) Environet dashboards and the [Aethair App](https://aethair.io/platform/app/) show the instrument's readings just like any Aethair device. The occupant-facing [Aethair Dashboards](https://aethair.io/platform/dashboards/) status display is built around Aethair IAQ and Aethair PRO. Similar ## Other Weather Stations ### [Airmar](https://aethair.io/sensors/airmar-weather-stations/) [Weather Stations](https://aethair.io/sensors/airmar-weather-stations/) [Airmar WeatherStation instruments (compact, maintenance-free ultrasonic multisensors with no moving…](https://aethair.io/sensors/airmar-weather-stations/) ### [Davis](https://aethair.io/sensors/davis-weather-stations/) [Weather Stations](https://aethair.io/sensors/davis-weather-stations/) [Davis Instruments weather stations. The Vantage Pro2 and Vantage Vue are modern integrated stations…](https://aethair.io/sensors/davis-weather-stations/) ### [Lufft](https://aethair.io/sensors/lufft-weather-stations/) [Weather Stations](https://aethair.io/sensors/lufft-weather-stations/) [Lufft WS-series compact all-in-one weather sensors (UMB over RS485). One maintenance-free housing…](https://aethair.io/sensors/lufft-weather-stations/) ### [R.M. Young](https://aethair.io/sensors/r-m-young-weather-stations/) [Weather Stations](https://aethair.io/sensors/r-m-young-weather-stations/) [R.M. Young ResponseONE weather instruments, with solid-state ultrasonic wind sensing and no moving…](https://aethair.io/sensors/r-m-young-weather-stations/) Questions ## Gill Instruments MaxiMet FAQ How does the integration read a MaxiMet? Polled ASCII over RS232/RS422/RS485. The driver puts the unit into POLL message mode, reads back the configured REPORT field order, then polls with ?Q each interval and maps every named field to its measurement. Because the report order is read from the device, one driver serves every GMX model. Is dew point measured or derived? Derived. The MaxiMet computes dew point on-board from its temperature, humidity, and pressure sensors and emits it as a DEWPOINT field in the data string, which the integration records directly. Models without the PTU sensor block (GMX200, GMX240, GMX260) therefore report no dew point. Does the same driver work across the land and marine (Marine GMX260/GMX560) models? Yes. The driver queries the unit for its identity (%% info) and reads back the GMX model number. All MaxiMet models, land and marine, share the same ASCII/SDI-12/NMEA/MODBUS command set, so no per-model configuration is needed. Sources: [gillinstruments.com](https://gillinstruments.com/compare-weather-stations/maximet-weather-station/) · [gillinstruments.com](https://gillinstruments.com/wp-content/uploads/2024/09/MaxiMet-Iss3-2024.pdf)