LRF1200A1 905 nm Laser Rangefinder Module - GST inc

austarsmodel@yahoo.com (Austars Model Pty Ltd) — Thu, 05 Nov 2026 09:11:44 +0800

Meet the LRF1200A1

The LRF1200A1 is a cylindrical ranging module for compact instruments that need a serial distance output. Its specification lists a building-target measurement range of 5–1200 m and an update rate of 1–3 Hz.

The 0.1 m display increment is distinct from ranging accuracy. Accuracy is ±1 m from 5 to 100 m and follows a distance-dependent formula above 100 m. This distinction helps define a realistic display and acceptance test.

Electrical integration differs from the E series: the specified supply is 3.3 ± 0.1 V DC, not a general 3.3–5 V input range. Use the LRF1200A1 pin definition, low-power behavior, and communication protocol.

Cylindrical format

Ø23 × 40 mm dimensions and an 18 g specified mass.

Building-target ranging

5–1200 m range with 1–3 Hz output.

Separate resolution and accuracy

0.1 m display increment with a distance-dependent accuracy formula.

3.3 V electrical integration

3.3 ± 0.1 V DC supply and a 3.3 V TTL-level UART interface.

TECHNICAL DATA

LRF1200A1 Specifications

Read performance values with their target and test conditions. The linked user manual provides the complete mechanical, electrical, and communication details.

Parameter	Value	Conditions / notes
Laser wavelength	905 nm	�
Measurement range	5–1200 m	Building target; the source table gives ≥5–1200 m.
Ranging accuracy	±1 m (5 m ≤ L ≤ 100 m); ±(1 + 0.004L) m (L > 100 m)	L is distance in meters.
Display resolution	0.1 m	Reporting increment, not ranging accuracy.
Measurement update rate	1–3 Hz	�
Communication interface	UART, 3.3 V TTL	�
Supply voltage	3.3 ± 0.1 V DC	�
Standby power consumption	≤400 mW	�
Operating power consumption	≤1.5 W	�
Startup time	≤500 ms	�
Dimensions	Ø23 × 40 mm	Cylindrical; use the drawing tolerances.
Weight	18 g	�
Operating temperature	−20 �C to +60 �C	�
Storage temperature	−55 �C to +65 �C	�
Ingress protection	IP67	Lens only.
Laser safety class	Class 1	As stated in the model manual; finished-equipment assessment is separate.
Transmitter lens diameter	Ø6.6 mm	�
Receiver lens diameter	Ø18 mm	�

For civilian equipment only. The model manual prohibits military applications.

Operation and Data Output

The host uses the serial communication protocol to operate the ranging module. The low-power mode turns the controller off, so it does not respond to normal commands while asleep.

The manual describes an active-low enable input for normal operation and a high level for low-power mode. Use the LRF1200A1 interface and timing definitions rather than an E-series wiring assumption.

Electrical Interface

Pin	Signal	Function
1	GND	Power ground
2	Power Supply	3.3 V DC input; specified supply tolerance: ±0.1 V
3	NC	Not connected
4	TTL_TXD	Transmit data: module → host; 3.3 V TTL
5	TTL_RXD	Receive data: host → module; 3.3 V TTL
6	Enable Pin	Active low: normal operation. High level: low-power mode.

Mechanical Dimensions

Use the drawing and its tolerances for installation. This drawing is reproduced directly from the current LRF1200A1 user manual.

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