LRF1831C · 1535 nm Laser Rangefinder Module
LRF1831C UART wiring, pinout and serial protocol
The LRF1831C talks RS422 and is powered from DC12 V. Wire TX to the host RX, RX to the host TX, share ground, then send one of the commands below.
Electrical interface
| Parameter | Published value | Condition / note |
|---|---|---|
| Interface | RS422 | |
| Supply voltage | DC12 V |
LRF1831C pinout
| Pin | Signal | Note |
|---|---|---|
| 1 | TTL RX | 3.3V |
| 2 | TTL TX | 3.3V |
| 3 | CTRL | 3.3V-5V power on, 0V power off |
| 4 | +12V | Power supply+ |
| 5 | GND | Power supply- |
| 1 | GND | Serial Port Ground |
| 2 | GND | 12V Input Negative |
| 3 | GND | 12V Input Negative |
| 4 | VCC 5V | 12V Input Positive |
| 5 | VCC 5V | 12V Input Positive |
| 6 | RS422 RX+ | Serial Port Receive + |
| 7 | RS422 RX- | Serial Port Receive - |
| 8 | RS422 TX- | Serial Port Transmit - |
| 9 | RS422 TX+ | Serial Port Transmit + |
Reading it from a computer
Open the port at the baud rate above, 8 data bits, no parity, 1 stop bit. The UART protocol decoder shows the frames live in a browser over WebSerial, and the erdi-lrf-drivers repository has Python, Arduino and ROS 2 readers for this frame format.
Ordering the LRF1831C
The published single-unit price of the LRF1831C is $7,000, falling to $3,500 per unit at the largest published quantity band. Prices include shipping and are ordered directly from erdilrf.com. Technical questions and quantity quotes: tommy@erdimail.com. Full specification table, downloads and ordering: LRF1831C model page.
FAQ
What is the maximum range of the LRF1831C?
The published range is a) Under line-of-sight conditions, with visibility not less than 15 km and humidity not greater than 80% (at 30 °C), the ranging distance for Target 1 (5 m × 15 m) is ≥ 6,500 m. b) Under line-of-sight conditions, with visibility not less than 15 km and humidity not greater than 80% (at 30 °C), the ranging distance for a target with diffuse reflectance not less than 30% (20 m × 20 m) is ≥ 12,000 m.. A range figure is only comparable together with the target and conditions it was measured on, so the condition is listed next to the value.
Which interface does the LRF1831C use?
The published communication interface is RS422.
What laser wavelength does the LRF1831C use?
The published wavelength is 1535 ±5 nm; laser safety entry: Class I stated in the module document. Final accessible-emission classification applies to the complete configuration..
How much does the LRF1831C cost?
The published single-unit price of the LRF1831C is $7,000, falling to $3,500 per unit at the largest published quantity band. Prices include shipping and are ordered directly from erdilrf.com.
Related guides
Model records
Open the model page for the full specification table, downloads, published price and ordering.
- LRF1831C — LRF1831C 1535 nm Laser Rangefinder Module