GCM370-MI-SJ Low Power Consumption High Precision 3D Electronic Compass Product Manual V1.7-20260701

Technical Highlights ❖ Azimuth accuracy: 0.5°; ❖ Roll angle measurement range: ±180°; ❖ Tilt resolution: 0.1°; ❖ Tilt accuracy: <0.2° (full range); ❖ Standard TTL output interface. Product Introduction The GCM370-MI-SJ 3D compass features low power consumption and excellent measurement resolution, exhibiting balanced performance in noise suppression and temperature drift stability. Utilizing mature hard and soft iron calibration algorithms, and coupled with a high-performance accelerometer for tilt compensation, it provides reliable heading output across the entire 360° tool face range. Even...

Shock resistance Ordering and Selecting Communication communication protocol E.g: GCM370-TTL-SP-H-MI-SJ: TLL signal output / serial communication protocol / horizontal mounting Interface Definition H: Horizontal installation Line color

The 3D electronic compass azimuth measurement is based on the principle of geomagnetic induction. Installation requires an environment with minimal magnetic field interference. To ensure measurement accuracy, please follow these installation guidelines: 1. Magnetic Interference Protection Requirements: ❖ Keep away from ferrous materials, permanent magnets, motors, and other magnetic objects. ❖ Maintain a distance of at least 30cm from known sources of magnetic interference (the specific distance needs to be adjusted according to the magnetic field strength). ❖ Use copper fasteners for secure...

Calibration method Calibration prerequisites: 1) The compass accuracy does not meet the requirements; 2) If there is a fixed magnetic field interference in the compass installation environment (e.g., installed on ferrous materials), the interference source and the compass must be rotated synchronously for calibration, and their relative positions must be kept fixed during use; otherwise, recalibration is required. If the size or distance of the interference source is not fixed (e.g., a variable iron component), calibration is not possible; a safe installation distance of at least 30cm should...

- www.ruicomtech.com Vertical installation calibration mode: Connect the LCM compass correctly to the communication port and turn on the power. 1)Rotate the plane more than 360° in one revolution: As shown in Figure D Horizontal Calibration Start Command 68 04 00 41 45 Data Field (0 bytes) Rotate horizontally at a constant speed for more than one revolution, ensuring the time is more than 20 seconds. Values saved are only valid if the time is more than 20 seconds; values saved are invalid if the time is less than 20 seconds. Horizontal Calibration Save Command 68 04 00 51 55 Data Field (0 bytes)...

Multi-point calibration method Calibration prerequisites: 1) The compass accuracy does not meet the requirements; 2) The compass installation environment has magnetic field interference. This interference is constant, and the distance between this interfering magnetic field and the compass will not change after installation (e.g., if the compass is installed on iron, the iron will cause magnetic interference. In this case, the iron and compass need to be rotated together for calibration, and they cannot be separated during use; if separated, recalibration is required. If the size of the iron...

- www.ruicomtech.com After acquiring the 4th point, keep H and R unchanged, then increase the angle value by +P. Refer to Figure B: Starting point H=0°, R=0°, P=+70°. Hold this position for 2-3 seconds; the system will acquire the 5th point. After acquiring the 5th point, rotate horizontally by 90°, holding this position for 2-3 seconds; the system will acquire the 6th point. After acquiring the 6th point, rotate horizontally by 90°, holding this position for 2-3 seconds; the system will acquire the 7th point. After acquiring the 7th point, rotate horizontally by 90°, holding this position for...

After acquiring the 20th point, increase the roll value (R) for calibration. Refer to Figure F: Starting point H=0°, R=-45°, P=0°. Maintain this posture for 2-3 seconds; the system will acquire the 21 st point. After acquiring the 21 st point, rotate horizontally by 90° and maintain this posture for 2-3 seconds; the system will acquire the 22nd point. After acquiring the 22nd point, rotate horizontally by 90° and maintain this posture for 2-3 seconds; the system will acquire the 23rd point. After acquiring the 23rd point, rotate horizontally by 90° and maintain this posture for 2-3 seconds; the...

Sensor response (Pitch, Roll, Heading): Command word 0X84 (Response to selecting the standard protocol) Data Field (1 byte) The number in the data field represents the sensor's response.

00 Successful setup FF Failed setup 2.3. Read magnetic declination command: command word 07H Data field (1 byte) Planar calibration response: 00H; Multi-point calibration response: 01H 2.6. Planar calibration and related instructions 2.6.1 Horizontal start calibration command: Command Word 41H The sensor must rotate horizontally at a constant speed for at least one revolution, and the saved value must be at least 20 seconds; values saved less than 20 seconds are invalid. Sensor response: Command word 41H

Data field (1 byte) The data field command shows progress 1-128, which represents a total of 128 points.

Data Field (0 bytes) Multi-point calibration start command (responding to other commands will only be effective three seconds after calibration begins) Sensor response: Command word 88H SA AA BB: The three characters represent the calibration residual coefficient of the sampling point. A value less than 1 indicates normal operation. The smaller the value, the more reliable the calibration. SC CD DD: The three characters represent the uniformity of the 3D calibration sampling points in all directions. This score should be less than 6%. The smaller the value, the more uniform the distribution of...