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Introduction
Even the most reliable Industrial 4G DTU can encounter connection problems in challenging agricultural environments. Based on our experience with thousands of installations, here are the most common issues and their solutions.
Issue 1: No Cellular Connection
Symptoms: DTU fails to connect to cellular network, no data transmission
Solutions:
- Verify SIM card is properly inserted and activated
- Check APN settings match your carrier’s requirements
- Test cellular signal strength at installation site
- Try different network modes (4G/3G/2G) if available
Issue 2: Intermittent Data Transmission
Symptoms: Data updates sporadically or with significant gaps
Solutions:
- Check antenna connection and orientation
- Verify signal strength is sufficient (aim for > -85 dBm)
- Review data reporting intervals – too frequent transmission can cause network congestion
- Enable data buffering for unstable connection areas
Issue 3: Sensor Communication Failures
Symptoms: DTU connects to network but shows no sensor data
Solutions:
- Verify RS485 wiring polarity and termination
- Check serial parameters match sensor specifications
- Confirm Modbus address mapping is correct
- Test sensors directly with a USB to RS485 converter
Issue 4: Power Problems
Symptoms: DTU restarts randomly or fails to maintain stable operation
Solutions:
- Verify power supply provides adequate current (at least 1A)
- Check for voltage drops over long cable runs
- Consider using a low power DTU with optimized power management
- Ensure proper grounding and surge protection
Issue 5: Configuration Loss
Symptoms: DTU reverts to default settings after power cycle
Solutions:
- Always save configuration changes before exiting
- Verify firmware is up to date
- Use configuration backup features when available
- Contact Valoris support for persistent issues
Practical Considerations
During extenive field testing, we found that in areas with extremely weak signals (below -110 dBm), the devices may experience occasional data packet loss. While this affects less than 2% of installations, it’s worth considering signal boosters for such challenging locations. The good news is that our data buffering feature typically handles these situations gracefully.
Preventative Measures for Agricultural Deployments
- Choose rugged 4G DTU for harsh environments with appropriate IP ratings
- Implement regular health checks and remote monitoring
- Use quality antennas and proper lightning protection
- Keep firmware updated for best performance and security
Valoris Advantage in Problem Resolution
As a top 10 4G Cellular DTU supplier in China, Valoris devices include comprehensive diagnostic tools and remote management capabilities. Our high quality manufacturing standards minimize field failures, and our technical support team specializes in agricultural application challenges.
