Maintenance‑free: replace fragile cables
Cables get damaged in rough environments. Link485 Zero is a maintenance‑free wireless point‑to‑point Modbus bridge that eliminates cable failures.
Link485 Zero
Zero-Configuration LoRa Modbus Bridge
The Link485 Zero is an industrial Modbus bridge featuring true zero-configuration wireless connectivity. Simply power on both units and they automatically pair - no complex setup wizards, no programming required. Perfect for retrofitting existing Modbus installations or deploying new wireless sensor networks.
Zero Config
Auto-pair in seconds
Up to 400m Typical
Up to 2km with optimal placement
Industrial Grade
DIN rail / IP65 enclosure
Available Configurations
Buy / See ConfigurationsTechnical Specifications
Modbus Interface
| Protocol | Modbus RTU (RS-485) |
| Baud Rate | 1200 - 115200 bps (auto-detect) |
| Data Bits | 8 |
| Parity | None, Even, Odd |
| Stop Bits | 1 or 2 |
| Termination | 120Ω switchable |
LoRa Radio
| Frequency | 865-867 / 868-870 / 902-928 MHz |
| Range | ~400m typical, up to 2km optimal conditions |
| TX Power | +20 dBm (100 mW) |
| RX Sensitivity | -137 dBm @ SF12 |
| Modulation | LoRa (Chirp Spread Spectrum) |
| Configuration | Zero-config auto-pair |
Power & Environment
| Input Voltage | 12-24V DC |
| Power Consumption | Typical 2W, Peak 4W |
| Operating Temp | -20°C to +70°C |
| Storage Temp | -40°C to +85°C |
| Humidity | 5% to 95% RH (non-condensing) |
| Enclosure | DIN: IP20 / IP65: IP65 rated |
Physical & Compliance
| Dimensions (DIN) | 90 × 60 × 35 mm |
| Dimensions (IP65) | 120 × 80 × 50 mm |
| Weight | 150g (DIN), 220g (IP65) |
| Mounting | 35mm DIN rail or wall mount |
| Indicators | Power, Link, TX/RX LEDs |
How Link485 Zero Works
Three simple steps to wireless Modbus connectivity
1
Connect
Connect your Modbus master to Unit A and your Modbus slave(s) to Unit B. Connect power to both units.
2
Auto-Pair
Units automatically discover each other and establish a secure LoRa link. No configuration needed - it just works!
3
Communicate
Your Modbus master can now communicate wirelessly with remote slaves as if they were directly connected.
Common Applications
Factory Retrofits
Replace expensive cable runs in existing facilities. Monitor machines across multiple buildings without trenching or conduit.
HVAC Control
Connect distributed HVAC units in malls, hotels, and office buildings. Central monitoring and control without complex wiring.
Energy Monitoring
Wireless metering for multi-tenant buildings, solar installations, and distributed energy systems. Real-time consumption tracking.
Water & Pumps
Monitor and control remote pump stations, water tanks, and treatment facilities. Reliable long-range communication.
Why use Link485 Zero
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Lower install cost than pulling cable
Cable is cheap; installation is not. Avoid trenching, conduits, shutdowns, and permits by going wireless.
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Immune to electrical noise
High‑voltage areas and EMI can disrupt RS‑485 even with shielding. Wireless LoRa sidesteps interference entirely.
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Penetrates walls and floors
Long‑range LoRa reliably passes through walls and multiple floors; line‑of‑sight is helpful but not required.
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Zero‑configuration and easy for anyone
Low‑cost system that works out of the box. No training or technical expertise needed.
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Pre‑configured with app‑based channel control
Ships pre‑configured. The mobile app lets you set channels so multiple pairs can coexist without crosstalk or data loss.
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Data integrity with checksum and retries
Built‑in checksum validation ensures correctness; corrupted frames are automatically retried.
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One pair, many devices
Supports multi‑drop RS‑485: connect multiple slave devices on the remote bus to a single master through one Link485 Zero pair.
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Traffic visibility via LEDs and app
TX/RX LEDs show live activity at a glance, and the companion mobile app provides simple traffic visualization for quick diagnostics.
What's In The Box
2× Link485 Zero Units
Master and slave bridge pair
2× Power Adapters
12V DC, 1A (optional)
Mounting Hardware
DIN clips / Screws
Quick Start Guide
Installation instructions
Frequently Asked Questions
Link485 Zero units automatically discover each other on power-up using a proprietary pairing protocol. No manual configuration, IP addresses, or network setup required. Just connect your Modbus devices and power - it works within seconds.
Typical Range: Most installations achieve around 400 meters when devices are mounted at standard height (~4ft / 1.2m above ground).
Extended Range: With optimal conditions including elevated mounting (rooftop, poles), clear line-of-sight, and minimal interference, range can reach up to 2 kilometers.
Range Optimization: Fiber antennas, higher mounting positions, and proper antenna alignment can extend range to several kilometers. Check our range optimization guides for detailed tips.
💡 Pro Tip: We recommend planning for 400m range in your first deployment. You can always extend it later with antenna upgrades and better placement.
Yes! Each pair operates independently with automatic channel selection to avoid interference. You can deploy dozens of Link485 Zero pairs in the same facility.
Link485 Zero supports standard Modbus RTU over RS-485. It's transparent to your Modbus master and slaves - they don't need to "know" about the wireless link. Compatible with PLCs, HMIs, meters, sensors, and any Modbus RTU device.
