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  • RS485 multi-device connection diagram with master 485 terminal and multiple sensor slave nodes (A/B)
  • TTL and RS485 interface description table with wire colors and pins (VCC, RX/TX, A/B, GND)
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WitMotion HWT3100-485 Three-Axis Electronic Compass Geomagnetic Sensor for RS485 Modbus RTU (IP67)

WitMotion HWT3100-485 Three-Axis Electronic Compass Geomagnetic Sensor for RS485 Modbus RTU (IP67)

WitMotion

$72.72 USD
$72.72 USD
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Overview

WitMotion HWT3100-485 is a three-axis electronic compass geomagnetic sensor designed for 3-axis geomagnetic intensity measurement and heading angle output. It supports RS485 multi-device connection (up to 50 devices simultaneously) and uses Modbus RTU communication for integration into industrial and embedded systems.

Key Features

  • 3-axis magnetic field output and heading angle output
  • Portable fluxgate digital gauss meter design
  • RS485 multi-device connection: up to 50 multiple connections simultaneously
  • High resolution; one-key reset; magnetic auto-recovery
  • IP67 protection; high-quality aluminum shell; suitable for harsh environments
  • Soaking in water can be up to 30 mins (as stated)
  • Easy to read graphs: simple, visual data review in real time; quickly know data changes
  • From provided description: selectable measurement range and output rate (0.2-100Hz stated); 32-bit processor; SCA3300 temp-compensation MEMS module; RM3100 magnetometer-compensation chip; dynamic fusion algorithm and Kalman Filtering; angle measurement accuracy 0.05 degree (X, Y-axis), low-drift Z-axis angle, automatic data correction, large signal-noise immunity

Specifications

Name HWT3100 Fluxgate Sensor
Brand WitMotion
Model (this listing) HWT3100-485
Voltage 5V-36V
Current RS485 version: <10mA (TTL version reference: <6mA)
Protocol Modbus RTU
Baud rate 9600 (default), 115200, 460800
Communication Serial TTL / Serial 485
Range -800uT to +800uT
Sensitivity 13nT/LSB
Data output 0.1Hz-100Hz (TTL), Modbus RTU
Temperature -40 C to +85 C
Weight Sensor: 50g; cable (1m, weight: 48g)
Size 83*25*25mm / 3.27*0.99*0.99"
Mounting 2 x M2
Mechanical drawing callouts 83mm length; 25mm body height; 21.5mm (callout); 40mm (callout); 16mm (callout); 16.2mm (callout)

Built-in Sensor Chips

  • 2* Sen-XY-f (pn13104) geomagnetic module
  • 1* Sen-Z-f (pn13101) geomagnetic module
  • 1* MagI2C (pn13156) control chip

Parameter Table (Cycle Counts)

Parameter 50 100 200
Field Measurement Range -800uT to +800uT
Noise 30nT 20nT 15nT
Gain@3V (LSB/uT) 20nT 38nT 75nT
Linearity over +/-200uT 0.5% (typical)
Sensitivity 50nT 26nT 13nT
Max 3-Axis Sample Rate 534uA 284uA 147uA
Current Usage@8Hz, 3Axes 70uA 135uA 260uA
Circuit Oscillation Frequency 180kHz
Bias Resistor (RB) 121

Interface (Wire Color / PIN Definition)

TTL version interface description (reference)

Color PIN Definition
Red VCC 5-36V power input
Green RX Serial data input, TTL level
Yellow TX Serial data output, TTL level
Black GND Ground wire

485 version interface description

Color PIN Definition
Red VCC 5-36V power input
Green B Differential signal 485 communication A
Yellow A Differential signal 485 communication B
Black GND Ground wire

Data Output Notes

  • Supports Modbus RTU raw data output.
  • Serial ASCII code output is shown for the serial version; note: the RS485 version does not support the ASCII output mode.

Applications

  • Magnet
  • Speaker
  • Mechanical Part
  • Magnetic Separator
  • DC
  • Iron Remover

Support & Warranty

Warranty: 12-month warranty (as stated). A tutorial link is printed on the guiding card inside the package. For order support, integration questions, or wiring help, contact support@rcdrone.top or visit https://rcdrone.top/.

Details

Promotional banner for ultra-high accuracy MEMS IMU solutions for IoT, mapping, and monitoring applicationsModel selection chart comparing HWT3100 TTL and HWT3100-485 RS485 versions with voltage, current, and protocol

Choose the HWT3100-485 version for RS485 networks using Modbus RTU communication.

WitMotion HWT3100 fluxgate geomagnetic sensor with 3-axis magnetic field and heading angle output highlights

The HWT3100-485 measures 3-axis geomagnetic intensity and outputs heading angle for compass and orientation tasks.

IP67 protection graphic showing the aluminum HWT3100 sensor housing with water splash resistance message

An IP67-rated aluminum shell supports use in harsh environments where dust and water exposure are expected.

Applications collage showing magnets, speaker, mechanical parts, magnetic separator, DC motor, and iron remover

Suitable for integration into equipment affected by magnetic fields such as motors, separators, and other industrial assemblies.

Magnetic field output demo with sensor in hand and PC dashboard displaying 3-axis magnetic readings and headingRS485 multi-device connection diagram with master terminal and multiple slave sensors on A/B differential bus (up to 50)

RS485 multi-drop wiring supports connecting up to 50 sensors on the same bus for scalable deployments.

PC software graph interface displaying real-time trend lines for magnetic field channels and related valuesRaw data table screenshot showing serial ASCII output example and note that RS485 version does not support ASCII mode

For HWT3100-485, use Modbus RTU rather than ASCII output mode.

Modbus RTU raw data screenshot showing register-style output table for magnetic field readings and heading values

Modbus RTU output makes it straightforward to parse readings in PLCs, gateways, and embedded controllers.

Advantages comparison graphic contrasting fluxgate sensor module features versus RM3100 chip and discrete solutionsSpecifications table and mechanical dimensions for WitMotion HWT3100-485, including size 83×25×25 mm and range ±800 µT

Mechanical dimensions and core specs are provided for enclosure planning, mounting, and system power budgeting.

Parameter table listing noise, gain, linearity, sensitivity, sample rate, and current usage across cycle count settingsWiring/pin definition tables for TTL and RS485 versions with wire colors for VCC, A/B (or RX/TX), and GND

Wire color definitions help verify power and communications connections before commissioning.

Wiring connection diagrams for TTL, MCU UART, and RS485 interface showing VCC, GND, and signal line routing

Connection diagrams summarize typical hookups for MCU UART (TTL) and differential RS485 (A/B) installations.

Protocol reference page showing ASCII (AT command) samples and Modbus mode read/write command frame structureDevelopment kits graphic listing included resources: manual, PC software, and sample code

Documentation, PC tools, and sample code support faster setup and integration.

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