Mid-Scale Hotel Room Control System
A scalable GRMS platform engineered for properties with 60 to 200 rooms. Full DALI dimming, multi-scene pre-sets, BMS integration, and per-room energy monitoring — all backed by a centralized management server.
Built for Scale
Mid-scale hotels — branded properties, serviced apartments, and airport hotels — operate at a volume where reliability and consistency become critical. With 60 to 200 rooms, manual room-by-room configuration is impractical, and guests expect a predictable, branded experience across every room category. Our mid-scale GRMS solution introduces a head-end server that synchronizes settings across all rooms, a floor-level RCU backbone that segments the network for resilience, and room-level controllers that execute scenes independently even if the network is interrupted. This layered architecture has been deployed in properties from Bangkok to Dubai, proving itself across tropical humidity, power fluctuations, and high-occupancy seasonal peaks.
System Architecture
A three-tier architecture delivers enterprise reliability with straightforward deployment.
Head-End Server
A central management server runs on a dedicated workstation or virtual machine. It hosts the monitoring dashboard, stores configuration profiles for each room type, logs energy and occupancy data, and provides the interface for engineering and front-desk teams. Redundant server options are available for properties requiring 24/7 uptime.
Floor-Level RCU
Each floor is served by an aggregation RCU that connects to the head-end server via Ethernet and to room controllers via RS485. This segmentation limits the blast radius of any single cable fault and allows maintenance on one floor without affecting others — a key operational requirement for hotels that cannot afford full shutdowns.
Room Controllers
Each guest room has a dedicated RCU that executes scene commands, reads sensors, and controls HVAC, lighting, and curtains. These controllers operate autonomously — if the floor RCU or server goes offline, guests continue using all in-room functions without interruption. Configuration changes sync automatically when connectivity is restored.
Core Capabilities
Room Configuration
Standard mid-scale room configuration with expanded I/O for additional circuits and zones.
| Item | Model / Specification | Quantity per Room |
|---|---|---|
| RCU Controller | GRMS-RCU-M8 — 8-relay, 8-digital input, 2× DALI bus, RS485, Ethernet | 1 |
| Touch Panel | GRMS-TP8 — 8-scene capacitive touch, 86×172 mm, temperature display | 1 |
| Occupancy Sensor | Ceiling-mount PIR + ultrasonic dual-tech, 8 m range | 1 |
| Door Sensor | Magnetic reed switch, wired, flush-mount | 2 (entry + bathroom) |
| Card Switch | RFID + key card slot, 86×86 mm, LED indicator | 1 |
| Curtain Motor Controller | GRMS-CM4 — quad-channel, RS485, with position feedback | 1 |
| DALI LED Driver | 4-channel constant-current, 350–700 mA per channel | 2 |
| FCU Controller Module | 3-speed fan + valve control, RS485, Modbus register map | 1 |
| Power Supply & Enclosure | 24 V DC / 10 A, DIN-rail metal enclosure with ventilation | 1 |
| Floor Aggregation RCU | GRMS-AGG — 16× RS485 ports, dual Ethernet, shared per floor | 1 per floor |
Why DALI Protocol
DALI (Digital Addressable Lighting Interface) is the preferred protocol for mid-scale hotel lighting control because it combines open-standard interoperability with granular addressability. Unlike 0–10 V analog dimming, DALI supports two-way communication — the controller not only sends commands to luminaires but also reads back lamp status, runtime hours, and failure reports. This means maintenance teams can identify a failed driver before a guest reports a dark room. Each DALI bus supports up to 64 individually addressable devices, and multiple buses can be combined on a single RCU, providing ample capacity for rooms with layered lighting designs. Critically, DALI is governed by the IEC 62386 international standard and is supported by hundreds of manufacturers worldwide, eliminating proprietary lock-in and ensuring replacement parts remain available over the system's 15–20 year lifecycle. For hotel groups that standardize across multiple properties, DALI ensures consistent behaviour regardless of which luminaire brand is specified locally.
ROI Analysis
Mid-scale hotel operators who deploy our GRMS solution typically report a 30% reduction in guest room energy consumption within the first year — primarily through occupancy-based HVAC setback and automated curtain control that reduces solar heat gain during unoccupied hours. Maintenance call-outs drop by an estimated 25% because the system proactively reports device faults rather than waiting for a guest complaint, and the BMS dashboard allows engineering teams to diagnose issues remotely before dispatching staff. Guest satisfaction scores, measured through post-stay surveys, show measurable improvement in categories related to room comfort and lighting control. When factoring in energy savings, reduced labour costs, and the competitive advantage of a modern in-room experience, the typical payback period for the full GRMS deployment ranges from 18 to 30 months depending on room count and local utility rates.
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