RS485 MODBUS-RTU Smoke Detector

Features

The SPD-668D stands out for its industrial-grade performance and user-centric design, with key characteristics including:

Wide Power Supply Range

It supports DC9V~DC60V power supply, adapting to various on-site power conditions (custom voltage options are available for special needs). This flexibility eliminates the need for additional power converters, reducing installation costs.

High Sensitivity & Stability

Equipped with advanced optical sensors, the detector offers exceptional sensitivity to visible smoke from slow smoldering or open combustion. Its low power consumption (≤4mA static current, ≤120mA alarm current) ensures long-term reliable operation without frequent battery replacements (note: it uses DC power, no built-in battery).

Seamless System Integration

With MODBUS-RTU protocol support (default address: 1; default baud rate: 9600bps), it easily connects to third-party monitoring systems—critical for users who need centralized control over multiple safety devices. The adjustable baud rate (1200/2400/4800/9600/19200bps) and address (1-254) further enhance compatibility.

Durable & Easy to Use

Crafted with robust materials, it withstands harsh environments (operating temperature: -20℃~+60℃; ambient humidity: ≤95%RH @25℃±2℃). Its compact size (104mm diameter × 53mm height) allows flexible mounting in tight spaces, while the intuitive test button simplifies routine maintenance.

Technical Parameters

The SPD-668D MODBUS Smoke Detector meets industrial standards with the following technical specifications:

• Power Supply: DC9V~DC60V (custom voltages available for specific requirements), ensuring compatibility with most on-site power sources.

• Current Consumption: Static current ≤4mA (energy-efficient for long-term use); alarm current ≤120mA (sufficient to power sound and light alarms without overload).

• Communication Protocol: MODBUS-RTU (industry-standard for reliable data transmission between devices).

• Communication Interface: RS485 (supports long-distance communication, ideal for large facilities like warehouses or hotels).

• Address Setting: 1-254 (default: 1; adjustable to avoid conflicts with other devices in the system).

• Baud Rate: 1200/2400/4800/9600/19200bps (default: 9600bps; customizable for different network speeds).

• Operating Environment: Temperature range -20℃~+60℃ (works in cold storage or warm industrial areas); humidity ≤95%RH (25℃±2℃, suitable for damp spaces like basements).

• Alarm Features: Sound and light alarm (buzzer volume ≥85dB at 3 meters, ensuring visibility/audibility even in noisy environments).

• Dimensions: 104mm (diameter) × 53mm (height) (compact design for easy installation on ceilings or walls).

Applications

The SPD-668D is versatile for indoor smoke detection, with ideal applications in:

Commercial & Residential Spaces

• Residential buildings: Protects homes from fire risks by detecting smoke from kitchen accidents or electrical faults.

• Shops, hotels, and dance halls: Ensures public safety in high-foot-traffic areas, where quick smoke detection can prevent large-scale emergencies.

Industrial & Critical Facilities

• Computer rooms: A top choice for computer room monitoring, as its fast response and MODBUS-RTU protocol compatibility enable instant alerts to IT teams, preventing server damage from smoke or fire.

• Warehouses: Detects smoke from stored goods (e.g., paper, textiles) before fires spread, safeguarding inventory and personnel.

• Data centers and server rooms: Works with existing monitoring systems to maintain 24/7 safety, a must for facilities with zero tolerance for downtime.

FAQ

Does the SPD-668D MODBUS Smoke Detector include a built-in battery?

No. The detector is powered by DC9V~DC60V external power (custom voltages available). It does not have a built-in battery, so we recommend connecting it to a stable power source for continuous operation.

How do I connect the detector to a third-party monitoring system?

The detector uses RS485 output and supports the MODBUS-RTU protocol—a universal standard for industrial communication. As long as your third-party system also supports MODBUS-RTU, you can connect them directly via RS485 wiring (adjust address/baud rate if needed for system compatibility).

Can I adjust the baud rate and address of the SPD-668D?

Yes. The default baud rate is 9600bps (adjustable to 1200/2400/4800/19200bps), and the default address is 1 (adjustable to 1-254). This flexibility allows you to integrate multiple detectors into one system without communication conflicts.