[Communication interface]：RS485
[Working voltage]：DC 5~24V
[Positioning system]：BDS/GPS/GLONASS/GALILEO
[Communication protocol]：Modbus RTU
[Product size]：103*28*28.5mm
| Serial number | Project | Specification |
| 1 | Power supply voltage | 5V~24V DC |
| 2 | Communication interface | RS485 |
| 3 | Baud rate range | 1200-115200bps |
| 4 | Communication protocol | Modbus RTU |
| 5 | Supported positioning system | BDS/GPS/GLONASS/GALILEO |
| 6 | Working frequency band | GPS L1 C/A, QZSS L1 C/A/S, GON |
| 7 | Positioning refresh rate | 1Hz ~ 25Hz |
| 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 | 28 | S | |
| Hot start | 1 | S | ||
| Recapture | 1 | S | ||
| Sensitivity (Test condition 2) |
Cold start | -148 | dBm | |
| Hot start | -159 | dBm | ||
| Recapture | -160 | dBm | ||
| track | -167 | dBm | ||
| Accuracy (Test condition 3) |
Horizontal positioning accuracy | 1.5 | m | |
| Speed positioning accuracy | 0.05 | m/s | ||
| Timing accuracy | RMS | 30 | ns | |
| 99% | 60 | 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 and Fleet Management
By integrating the EWD108-GN04(485) with vehicle-mounted PLCs, logistics companies can monitor fleet locations in real-time across multiple GNSS constellations. The Modbus RTU protocol ensures that position data is easily readable by existing onboard telematics systems, optimizing route planning and asset tracking.
2. Remote Industrial Site Monitoring
For stationary assets like oil wellheads or distributed power grid equipment, this module provides precise time and location synchronization. The device allows central control systems to verify site status alongside location data, ensuring that maintenance teams are dispatched to the exact coordinates during emergencies.
3. Automated Agriculture Machinery
Modern agricultural machinery, such as self-driving tractors and harvesters, requires high-precision positioning. This terminal serves as a reliable GNSS data input for field controllers, enabling autonomous navigation through multi-system satellite tracking to ensure crop rows are managed with maximum accuracy.
FAQ Section
1. How does the device handle positioning data formats?
The device outputs data through two methods: it provides RMC-ASCII strings compliant with the NMEA0183 protocol for legacy system compatibility, and it stores specific coordinates (longitude, latitude, and directional indicators) in distinct Modbus registers for direct PLC access.
2. Can I change the baud rate after the initial configuration?
Yes. The serial port baud rate can reach up to 115200bps and is easily modifiable through the Modbus RTU protocol. This flexibility allows engineers to adjust the data communication speed to match the specific requirements of their existing industrial automation networks.
3. Is the device compatible with standard industrial PLCs?
Absolutely. By utilizing the standard Modbus RTU protocol, the EWD108-GN04(485) ensures "plug-and-play" compatibility with virtually all major industrial PLC brands, including Siemens, Mitsubishi, and Schneider Electric, without requiring complex driver development.
