Beitian BT-M422 RTK GNSS Module Board, 1408ch Nebulas IV, UART TTL + Ethernet, SMA-KW, 12V
Beitian BT-M422 RTK GNSS Module Board, 1408ch Nebulas IV, UART TTL + Ethernet, SMA-KW, 12V
Beitian
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$263.66 USD
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Overview
Beitian BT-M422 is an RTK GNSS module board designed for differential high-precision positioning applications such as agricultural machinery and drone/UAV navigation. It supports multi-constellation, multi-band GNSS reception and provides both TTL UART and Ethernet interfaces for data output and integration.
Key Features
- 1408 channels (based on Nebulas IV)
- Multi-constellation / multi-frequency support: BDS, GPS, GLONASS, Galileo, QZSS
- RTK, DGPS and single-point positioning modes (performance listed in Specifications)
- Interfaces: 1.25 mm pitch 6-pin UART (TTL level) and Ethernet interface
- Antenna interface: SMA-KW
- Differential corrections: RTCM V3.X
- NMEA-0183 output with default sentences: GGA, RMC, VTG, GSA, GSV
Specifications
| Item | Description |
|---|---|
| Chipset | RTK GNSS Module |
| Frequency | BDS B1I/B2I/B3I/B1C/B2a/B2b*; GPS L1C/A/L2P(Y)/L5; GLONASS L1/L2; Galileo E1/E5a/E5b/E6*; QZSS L1/L2/L5/L6* |
| Channels | 1408 channels, based on Nebulas IV |
| Single point positioning (RMS) | Plane: 1.5 m; Elevation: 2.5 m |
| DGPS (RMS) | Plane: 0.4 m; Elevation: 0.8 m |
| RTK (RMS) | Plane: 0.8 cm + 1 ppm; Elevation: 1.5 cm + 1 ppm |
| Time Accuracy (RMS) | 20 ns |
| Speed Accuracy (RMS) | 0.2 m/s |
| Cold boot | <20 s |
| Initialization time | <5 s (typical) |
| Initialization reliability | >99.9% |
| Baud rate | 4800 bps ~ 921600 bps (default 115200 bps) |
| Output level | TTL level |
| Differential data | RTCM V3.X |
| Output statement | default: GGA, RMC, VTG, GSA, GSV |
| Data format | NMEA-0183, Unicore* |
| Update frequency | ≤50 Hz* (default: 1 Hz) |
| Voltage | 12 V |
| Current | 112 mA / 12.0 V |
| Size | 66 x 45 x 14.7 mm |
| Weight | 21 g |
| Connector | 1 x 1.25 spacing 6-pin with lock seat; 1 x Ethernet interface |
| Antenna interface | SMA-KW |
| Operating temperature | -40C ~ +85C |
| Storage temperature | -40C ~ +105C |
Observation Accuracy (RMS)
| Signal | Measurement | BDS | GPS | GLONASS | Galileo |
|---|---|---|---|---|---|
| B1I/B1C/L1C/A/G1/E1 | False distance | 10 cm | 10 cm | 10 cm | 10 cm |
| B1I/B1C/L1C/A/G1/E1 | Carrier phase | 1 mm | 1 mm | 1 mm | 1 mm |
| B2I/B2a/B2b/L5/E5a/E5b | False distance | 10 cm | 10 cm | 10 cm | 10 cm |
| B2I/B2a/B2b/L5/E5a/E5b | Carrier phase | 1 mm | 1 mm | 1 mm | 1 mm |
| B3I/L2P(Y)/L2C/G2 | False distance | 10 cm | 10 cm | 10 cm | 10 cm |
| B3I/L2P(Y)/L2C/G2 | Carrier phase | 1 mm | 1 mm | 1 mm | 1 mm |
Indicator Lights
- TCP1: A solid green light indicates a port 1 connection in TCP mode.
- TX: The blue light flashes on power-up, indicating that the port has data output.
- STA: The green light flashes on power to indicate that the network port chip is working normally.
- RTK: The mobile terminal does not enter RTK mode, and the light is always on; when entering RTK Fixed mode, the red light does not come on; the base station is always on regardless of its status.
- PVT: Positioning is always on.
Pin Description
1.25 mm 6P Interface
| Pin | Name | I/O | Description |
|---|---|---|---|
| 1 | VCC | I | 12.0 V |
| 2 | RX2 | I | UART communication data input interface, TTL level |
| 3 | TX2 | O | UART communication data output interface, TTL level |
| 4 | EXT | I | GNSS event triggering |
| 5 | PPS | O | Synchronized satellite time pulses |
| 6 | GND | G | grounding |
Ethernet Interface
| Pin | Name | I/O | Description |
|---|---|---|---|
| 1 | 3V3 | I | Main power supply, DC output DC 3.3 V |
| 2 | TX+ | O | Send data |
| 3 | TX- | O | Send data- |
| 4 | RX- | I | Receive data- |
| 5 | RX+ | I | Receive data+ |
| 6 | GLED | Control feet | |
| 7 | YLED | Control feet | |
| 8 | GND | G | grounding |
Mechanical Drawing (Key Dimensions)
- Board outline: 66.0 0.2 mm x 45.0 0.2 mm
- Thickness/height reference: 14.7 0.2 mm; 10.9 0.2 mm; 3.8 0.2 mm; 1.2 mm
- Mounting holes: 4 x 3.2 mm
- Additional marked dimensions: 39.0 0.1 mm; 22.0 mm; 17.0 mm; 6.0 mm
Applications
- RTK differential positioning for agricultural machinery guidance
- Drone/UAV GNSS positioning integration
- Robotics and outdoor navigation projects requiring RTCM and NMEA output
For integration questions (UART/Ethernet setup, output sentences, update rate), contact [email protected] or visit https://rcdrone.top/.
Details
A quick reference for the BT-M422 board layout, key specifications, and mechanical dimensions for easier enclosure and wiring planning.