LG5120
LG5120
Intelligent Building Control Center for KNX, BACnet, M-Bus, LoRaWAN and Edge Automation
The Robustel LG5120 is an industrial-grade edge computing gateway engineered specifically for building automation and facility management. Where most IoT gateways aggregate data and forward it upstream, the LG5120 is designed to act on it locally — running automation logic, triggering controls, and generating dashboards at the edge while syncing with cloud platforms for centralised reporting and fleet management.
The hardware is built around the protocols buildings actually use. A dedicated KNX TP port and KNXnetIP over Ethernet connect directly to lighting systems, HVAC controllers, and room management units without a protocol converter. Two isolated RS-485 ports handle Modbus RTU and BACnet MS/TP field devices. M-Bus manages heat, water, and energy meter networks. A dedicated P1/DSMR port (up to 115,200 bps) connects directly to high-speed Dutch smart meters for real-time consumption data — particularly relevant for EU868 deployments in the Netherlands and Belgium. Two software-configurable analog inputs (0–24V or 4–20mA) accommodate sensors that don’t use a digital bus. An onboard Semtech SX1302 LoRaWAN chipset covers wireless sensors — temperature, humidity, occupancy, CO₂ — across 8 simultaneous channels on EU868, AU915, or AS923 frequency plans.
Processing runs on a Quad-core ARM Cortex-A53 at 1.6 GHz with an integrated NPU rated at 2.3 TOPS, 8 GB DDR4, and 64 GB eMMC — with 7 GB of RAM and 60 GB of flash available to the SDK. The E2C Facility Suite provides the software framework: unified data acquisition across KNX, BACnet, Modbus, and OPC-UA; Node-RED orchestration with automated scene management for trigger-based control; BACnet IP and OPC-UA data forwarding to external BMS or SCADA systems; and a drag-and-drop HMI/SCADA dashboard builder with real-time multi-channel alarms.
Features
- The 6C Runtime Capabilities: A unified runtime that seamlessly Collects data, Computes logic, Caches logs, provides a Canvas for visualization, Connects IT/OT, and enables bidirectional Control.
- Niagara Framework Inside: Features a built-in Niagara framework that acts as a "Lite BMS," supporting complex logic, smart alerts, and visual dashboards at the edge.
- One-Click ETS Integration: Supports the direct import of ETS files to autogenerate KNX mappings, reducing deployment time from days to minutes.
- Instant Semantic Mapping (LTE-Mode): Includes an integrated library of mainstream KNX devices to auto-map data points, eliminating manual configuration.
- Multi-Protocol Facility Aggregator: Natively integrates and bridges KNX, BACnet, M-Bus, P1, and LoRaWAN into a single unified stream (BACnet/IP or MQTT) for comprehensive building digitalization.
- Introduction
- Application
- Specification
- Download
- Get A Quote
Introduction
The Robustel LG5120 is an industrial-grade edge computing gateway optimized for E2C Facility (Edge-to-Cloud Facility) applications. Acting as an intelligent building control gateway, this version is designed to bridge the gap between traditional building automation and modern cloud management. It integrates a specialized expansion board to support common building automation protocols, natively supporting KNX, BACnet, and MBus alongside long-range wireless LoRaWAN.
Powered by a quad-core 1.6 GHz processor and the RobustOS Pro based on Debian 11, the LG5120 provides the local intelligence required to balance occupant comfort with energyefficiency goals. By processing complex logic at the edge—such as HVAC optimization and lighting automation—it delivers true "Cloud-Edge Synergy," reducing latency and ensuring operational continuity for commercial buildings, hospitals, and smart schools.
The Robustel Cloud Manager Service (RCMS) is a unified cloudbased platform designed for real-time monitoring and centralized management of industrial IoT devices. Fully compatible with Robustel routers and gateways, RCMS delivers an interactive geospatial dashboard that enables users to visualize device locations and track critical metrics such as data usage, signal strength, and network status. To ensure seamless operations, the platform facilitates over-the-air (OTA) updates for firmware, configurations, and applications, minimizing downtime while optimizing system performance.
Available Models
| Model | Supported Frequency Bands | Supported LoRa Frequency | Certifications | Order Code | Package Contents |
|---|---|---|---|---|---|
|
LG5120-GBKGC-4L-A35GL EU |
4G: LTE FDD: B1/2/3/4/5/7/8/12/13/18/19/20/25/26/28 LTE TDD: B38/39/40/41 3G: WCDMA: B1/2/4/5/6/8/19 2G: GSM: B2/3/5/8 |
EU868 | – | A016000001 |
1 x LG5120 (B Code: B016000001) 2 x Cellular Antenna 1 x Wi-Fi Antenna 1 x LoRa Antenna 1 x Power Adapter 1 x DIN Rail Mounting Kit |
|
LG5120-GCKGC-4L-A35GL ANZ |
4G: LTE FDD: B1/2/3/4/5/7/8/12/13/18/19/20/25/26/28 LTE TDD: B38/39/40/41 3G: WCDMA: B1/2/4/5/6/8/19 2G: GSM: B2/3/5/8 |
AU915 | – | A016000002 |
1 x LG5120 (B Code: B016000002) 2 x Cellular Antenna 1 x Wi-Fi Antenna 1 x LoRa Antenna 1 x Power Adapter 1 x DIN Rail Mounting Kit |
|
LG5120-GEKGC-4L-A35GL Asia |
4G: LTE FDD: B1/2/3/4/5/7/8/12/13/18/19/20/25/26/28 LTE TDD: B38/39/40/41 3G: WCDMA: B1/2/4/5/6/8/19 2G: GSM: B2/3/5/8 |
AS923 | – | A016000003 |
1 x LG5120 (B Code: B016000003) 2 x Cellular Antenna 1 x Wi-Fi Antenna 1 x LoRa Antenna 1 x Power Adapter 1 x DIN Rail Mounting Kit |
Application
Specification
System Architecture
| Operating System | RobustOS Pro |
| CPU | Quad-core Cortex-A53, 1.6 GHz |
| NPU | 2.3 TOPS |
| RAM | 8 GB DDR4 |
| Flash | 64 GB eMMC |
Cellular
| Supported Technologies | 4G/LTE, 3G, 2G |
| Antennas | 2 (MAIN + DIV) |
| Connector | SMA-K |
| SIM | 2 x Mini SIM (2FF) |
Cellular
| Ethernet Ports | 2 x RJ45, 10/100/1000 Mbps, compliant with 1000BASE-T; configurable as 1 x WAN + 1 x LAN or 2 x LAN |
| Magnet Isolation Protection | 1.5 kV |
LoRa
| Antennas | 1 |
| Connector | RP-SMA-K |
| Frequencies |
US915 EU868 AU915 AS923 |
| Channel Capacity | Supports up to 8 channels receiving data simultaneously |
Serial Port
| Serial Ports | 1 x M-Bus, 1 x KNX, 1 x P1, 2 x isolated RS-485, 1 x RS-232 |
| Connector | 3.5 mm terminal block |
| Signal Definition |
M-Bus: M+, M- KNX: K+, K- P1: P1-R, P1-D, GND RS-232: TXD, RXD, GND RS-485: Data+(A), Data-(B), GND |
Digital Input/Output
| DI/DO Ports | 2 x DI + 2 x DO, wet contact |
| Connector | 3.5 mm terminal block |
| Isolation | Bidirectional optocoupler for DI; unidirectional optocoupler for DO |
| Absolute Maximum Voltage | +30 VDC |
| Absolute Maximum Current | 100 mA |
| Signal Definition | DI1+, DI2+, DIcom, DO1+, DO2+, DOcom |
Analog Input Port
| Number of Interfaces | 2 x AI |
| Data Reading Type | Voltage / Current type, software configurable |
| Voltage Input Range | 0–24 V |
| Current Input Range | 4–20 mA |
| Signal Definition | AI1+, GND, AI2+, GND |
Wi-Fi Interface
| Number of Antennas | 1 x RP-SMA-K, supporting only 1T1R |
| Standards | 802.11 a/b/g/n/ac/ax, supports AP and client modes |
| Frequency Bands |
2.412–2.472 GHz (2.4 GHz ISM band) 5.15–5.825 GHz (5 GHz ISM band) |
Other Interfaces
| GNSS | Integrated GNSS with Cellular module |
| SD | 1 x microSD |
| Reset Button | 1 x RST |
| LED Indicators | 1 x RUN, 1 x Signal, 1 x USR, and 1 x MDM |
| Watchdog | External |
| USB | 1 x USB 3.0 (host), Type A, 5 V, 500 mA |
| RTC | Remains functional up to 7 days after power loss |
Power Supply & Consumption
| PSU Connector | 2-pin 3.5 mm terminal block with lock |
|---|---|
| Input Voltage |
12/24/48 V DC, 9–60 V DC, reverse polarity protection, surge protection |
| Power Consumption |
Idle: 5 W@12 V Max: 20 W@12 V |
| Recommended Power Supply | 12 V DC/1.5 A power adapter |
Physical Characteristics
| Ingress Protection | IP30 |
|---|---|
| Housing & Weight | Metal, 560 g |
| Dimensions | 49 x 105 x 128 mm |
| Installation Options | Desktop, Wall Mount and 35mm DIN Rail |
| Operating Temperature | -40 – +70°C |
| Storage Temperature | -40 – +85°C |
| Relative Humidity | 5 – 95% RH (non-condensing) |
Software Features
| LoRaWAN Protocols | V1.0.4 Class A/Class B/Class C |
|---|---|
| Network Protocols | PPP, PPPoE, ARP, VLAN, ICMP, NAT, TCP, UDP, DHCP, DNS, DDNS, NTP, HTTP, HTTPS, Telnet, SSH2, SMTP, Static Routing, etc. |
| VPN Tunnels | IPsec, OpenVPN, GRE, L2TP, PPTP, DMVPN, WireGuard |
| Firewalls | DMZ, anti-DDoS, Filtering (IP/Domain name/MAC address), Port Mapping, Access Control |
| Remote Management | RCMS, Web, CLI, SMS |
| Serial Port Protocols | Transparent, TCP Client/Server, UDP, Modbus RTU Gateway |
| SIM Management | Smart Roaming V3, Language, etc. |
| Optional Apps | Request on demand |
E2C Facility Suite
| LNS configuration | Built-in LoRaWAN Network Server with zero-code sensor integration |
| Data collection | Unified polling for KNX, BACnet, Modbus, and OPC-UA protocols |
| Logic Orchestration & Scenario Management | Node-RED orchestration and automated scene management for trigger-based control |
| Data forwarding | Converts edge data into BACnet/IP and OPC UA data streams for external systems |
| Alarms and Visualization | Real-time multi-channel alerts and a drag-and-drop HMI/SCADA dashboard builder |
Software Development Kit (SDK)
| Supported Programming Languages | C, C++, Python, Java, Node.js, etc. (for users to develop own applications) |
| Flash available for SDK | 60 GB |
| RAM available for SDK | 7 GB |
Regulatory and Type Approvals
| Environmental | RoHS 2.0 |
| EMI |
EN 55032 Conducted Emission Class B EN 55032 Radiated Emission Class B |
| EMS |
EN 61000-4-2 (ESD) Contact Level 3 EN 61000-4-3 (RS) Level 3 EN 61000-4-4 (EFT) Level 3 EN 61000-4-5 (Surge) Level 3, AC Mains Power Port; Level 3, Signal Ports EN 61000-4-6 (CS) Level 3 EN 61000-4-11 (Dips) |
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