Beitian BT-M422 RTK GNSS Module Board, 1408ch Nebulas IV, UART TTL + Ethernet, SMA-KW, 12V

Beitian

$263.66 USD

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Model BT-M422

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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