Waterproof RS485 Modbus RTU Magnetic Door Sensor – IP68 Wired
Waterproof RS485 Modbus RTU Magnetic Door Sensor – IP68 Wired
LIHTNE Waterproof Magnetic Door Contact Sensor with RS485 Modbus RTU
Monitor door and window open/close status with precision using the LIHTNE IP68 Waterproof Magnetic Door Sensor. Engineered for industrial, commercial, and demanding outdoor environments, this wired sensor communicates over the RS485 interface using the Modbus RTU protocol — making it ideal for integration into building automation systems, SCADA setups, access control panels, and smart monitoring networks.
Key Features
- RS485 Interface & Modbus RTU Protocol — Seamlessly integrates with industrial control systems; supports device addresses 1–253 for multi-device bus deployments.
- IP68 Waterproof Rating — Sealed with injected epoxy resin and silicone for complete protection against dust and sustained water immersion; safe for outdoor and wet-area installation.
- Wide Sensing Range — Induction distance of 20 to 50 mm for reliable detection even with slight door/frame misalignment.
- Long Service Life — Rated for 1,000,000 switch operations, delivering years of dependable performance in high-cycle environments.
- Wide Operating Temperature — Functions reliably from -20°C to +80°C, with humidity tolerance of 20–95% RH — suited for extreme climates and industrial conditions.
- Flame-Retardant PC Plastic Shell — Housing constructed from UL94 V-1 rated polycarbonate for fire safety compliance.
- Wired AWR Cable — Comes with AWR 5×0.3 cable specification for robust, interference-resistant signal transmission.
Technical Specifications
| Interface | RS485 |
| Protocol | Modbus RTU |
| Device Address Range | 1–253 |
| Induction Distance | 20–50 mm |
| Switch Life | 1,000,000 operations |
| Operating Temperature | -20°C to +80°C |
| Humidity | 20–95% RH |
| Storage Temperature | -40°C to +65°C |
| Waterproof Rating | IP68 (epoxy resin & silicone sealed) |
| Shell Material | PC Plastic, Flame Retardant V-1 |
| Cable | AWR 5×0.3 |
| Dimensions | A: 48 mm / B: 80×65×12×12 mm |
| Country of Origin | Made in China |
Ideal Applications
- Industrial door and gate access monitoring
- Building management and automation systems (BMS/BAS)
- Smart home and commercial security integration
- Outdoor enclosures, utility cabinets, and server room doors
- SCADA and PLC-based control environments
Learn More About Electrical Safety Standards
For guidance on electrical safety practices and sensor installation standards, visit the OSHA Electrical Safety Resource.
Frequently Asked Questions
Q: What is the RS485 Modbus RTU protocol and why does it matter for door sensors?
A: RS485 is a robust industrial communication standard that allows multiple devices to share a single cable run over long distances. Modbus RTU is the most widely used protocol over RS485, enabling this magnetic door sensor to be read by PLCs, HMIs, SCADA systems, and other industrial controllers. This makes the LIHTNE sensor an excellent choice for professional building automation and security monitoring setups.
Q: How many sensors can I connect on a single RS485 bus?
A: The sensor supports device addresses from 1 to 253, meaning you can connect up to 253 individual sensors on one RS485 network bus — greatly reducing wiring complexity in large installations such as warehouses, data centers, or multi-door commercial buildings.
Q: Is this door sensor truly waterproof for outdoor use?
A: Yes. The sensor carries an IP68 waterproof rating, achieved through injection of epoxy resin and silicone sealing around the cable entry and housing. IP68 is the highest standard ingress protection rating, meaning the sensor can withstand continuous submersion in water — making it fully suitable for outdoor doors, gates, and exposed industrial environments.
Q: What is the maximum sensing distance between the magnet and sensor body?
A: The induction distance is 20 to 50 mm, giving you flexibility during installation and accommodating slight misalignment between the sensor mounted on the door frame and the magnet on the door itself.
Q: Is any special wiring required for installation?
A: The sensor uses an AWR 5×0.3 cable and connects via standard RS485 two-wire (A/B) differential signaling. It works with any RS485-compatible controller or data acquisition system running Modbus RTU. No special proprietary hardware is needed.