The Ebyte EWD108-GN03(232) is a multi-mode GNSS positioning module supporting BDS/GPS/GLONASS with RS232 Modbus RTU interface, NMEA0183 RMC-ASCII output, DC 5-24V wide supply voltage, and standard DIN-rail mounting.
| Parameter Name | Parameter Value | Technical Details |
|---|---|---|
| Power Supply Voltage | DC 5V ~ 24V | Wide voltage input range for industrial systems |
| Communication Interface | RS232 | 4Pin 3.81mm Phoenix terminal connector |
| Baud Rate Range | 1200 ~ 115200 bps | Configurable serial port communication speed |
| Communication Protocol | Modbus RTU | Outputs NMEA0183 RMC-ASCII and discrete register values |
| Positioning Constellations | BDS / GPS / GLONASS | Concurrent multi-system positioning (B1/L1/L1 bands) |
| Update Rate & Accuracy | 1Hz ~ 10Hz; Horizontal < 2.5m | Speed accuracy < 0.1m/s, timing accuracy 30ns |
| Tracking & Cold Start Sensitivity | -162 dBm (Tracking) / -148 dBm (Cold) | Cold start time <= 32s, Hot start time <= 1s |
| Operating Temperature | -40 to +85 degrees C | Industrial grade temperature tolerance |
| Dimensions & Mounting | 103 x 28 x 28.5 mm | Standard DIN-rail guide installation housing |
| Serial number | project | Specification |
| 1 | Power supply voltage | 5V~24V DC |
| 2 | Communication interface | RS232 |
| 3 | Baud rate range | 1200-115200bps |
| 4 | Communication protocol | Modbus RTU |
| 5 | Supported positioning system | BDS/GPS/GLONASS |
| 6 | Working frequency band | BDS B1、GPS L1、GLONASS L1 |
| 7 | Positioning update rate | 1Hz~10Hz |
| 8 | User Configuration | Modbus RTU to modify the register, restart takes effect |
| 9 | Antenna interface | SMA (Official Threaded Inner Hole) |
| 10 | Hardware interface | 4Pin 3.81mm Phoenix Terminal |
| 11 | Size | 103×28×28.5mm（L×W×H） |
| 12 | Average weight | 32±5g |
| 13 | Operating temperature | -40 ~ +85℃, industrial grade |
| 14 | Working humidity | 10% ~ 90%, relative humidity, no condensation |
| category | Indicators | Typical values | unit |
| Positioning time (Test condition 1) |
Cold start | ≤32 | S |
| Hot start | ≤1 | S | |
| Recapture | ≤1 | S | |
| Sensitivity (Test condition 2) |
Cold start | -148 | dBm |
| Hot start | -156 | dBm | |
| Recapture | -160 | dBm | |
| track | -162 | dBm | |
| Accuracy (Test condition 3) |
Horizontal positioning accuracy | ＜2.5 | m |
| Speed positioning accuracy | ＜0.1 | m/s | |
| Timing accuracy | 30 | ns | |
| Power consumption (Test condition 4) |
Capture current | 30 | and |
| Tracking current | 20 | and | |
| Operating temperature | - | -35℃-85℃ | - |
| Storage temperature | - | -55℃-100℃ | - |
| humidity | - | 5%-95%RH (no condensation) | - |
Note: The above results are GPS/Beidou dual-mode working mode
[Testing Condition 1]: The number of received satellites is greater than 6, the signal intensity of all satellites is -130dBm, the average value is taken after 10 tests, and the positioning error is 10 meters.
[Test Condition 2]: The external LNA noise figure is 0.8, the number of received satellites is greater than 6, and the received signal strength value under locked or locked conditions is locked within five minutes.
[Test Condition 3]: Open and unobstructed environment, boot up for 24 consecutive hours, 50%CEP.
[Test Condition 4]: The number of received satellites is greater than 6, and the signal strength of all satellites is -130dBm.
Practical Application Scenarios
1. Smart Logistics Cold Chain Vehicle Location Tracking
In long-distance fleet management, industrial telemetry gateways require real-time positioning metrics alongside temperature monitoring. The EWD108-GN03(232) connects via RS232 directly to host PLCs or vehicle terminal units, outputting concurrent BDS/GPS/GLONASS coordinates over Modbus RTU registers. Its DIN-rail housing ensures quick installation inside vehicle control cabinets powered by standard 12V or 24V vehicle power systems.
2. Remote Environmental Weather Station UTC Time and Location Synchronization
Autonomous weather monitoring stations deployed in remote locations rely on precise geographical mapping and microsecond clock synchronization. Operating with a timing accuracy of 30ns and high tracking sensitivity (-162 dBm), this module provides discrete latitude, longitude, and UTC timestamp data via Modbus registers, allowing remote data loggers to tag sensor readings accurately without manual clock calibration.
3. Distributed Solar Power Cabinet Asset Geolocation Management
For large-scale distributed photovoltaic power generation projects, monitoring centers need precise GPS/BDS location mapping for field-deployed inverter distribution cabinets. The EWD108-GN03(232) integrates into control panels via standard DIN-rail mounting, interfacing with industrial DTUs over RS232 to broadcast real-time location telemetry to central SCADA systems even under harsh outdoor operating temperatures ranging from -40 to +85 degrees C.
FAQ Section
1. How does the module output GNSS positioning data over the Modbus RTU protocol?
The module parses multi-mode GNSS constellation signals and maps positioning data directly into standard Modbus registers. Controllers can either read complete NMEA0183 RMC-ASCII strings or query discrete Modbus registers containing parsed longitude, latitude, direction indicators, speed, and UTC time, eliminating complex string parsing on resource-constrained host controllers.
2. Can the serial port baud rate and positioning update rate be modified directly by the user?
Yes, users can configure parameters through standard Modbus RTU write commands. The default factory baud rate is 9600 bps (configurable from 1200 to 115200 bps), and the positioning update rate can be adjusted from 1Hz up to 10Hz. Once register parameters are modified and the device is restarted, the new configuration takes effect immediately.
3. What antenna connection is required, and does the device feature hardware protection?
The module features an SMA female antenna interface (official threaded inner hole) designed for active GNSS antennas. For hardware reliability, it includes built-in power supply reverse connection protection, an integrated hardware watchdog to prevent system crashes during prolonged field operations, and a 4Pin 3.81mm Phoenix terminal for stable industrial wiring.
