Hotel GRMS &
Hospitality BMS
The complete smart building platform for luxury hotels, resorts, and hospitality projects — from guest room management to full building automation, emergency systems, and AI-powered analytics.
Complete In-Room GRMS Feature Set
Every feature a modern hotel guest room needs — in one unified, open-protocol platform that covers every hotel tier from budget to 7-star.
DND / MUR Signalling
Fully native DND and Make Up Room signalling — built into the same sBUS hardware and software as every other room function. No separate signalling system needed. Front-desk visibility, housekeeping management, and real-time room status dashboards are all part of the same integrated platform.
HVAC & Climate Control
Native per-room HVAC control built into the Smart G4 RCU — occupancy-based setback, energy saving modes, and FCU integration all run on the same sBUS protocol as lighting, curtains, and audio. No separate HVAC controller or gateway required.
Lighting Control & Scenes
Intelligent lighting scenes, dimming, and scheduling — fully native on the sBUS platform. From bedside controls to corridor and public area management, lighting shares the same hardware bus, software dashboard, and wiring infrastructure as every other GRMS function.
Motorized Shading & Curtains
Native motorized blind, blackout curtain, and sheer shading control — built into the same sBUS system as lighting and HVAC. Scene integration, guest override, and schedule control all run on the same platform with no additional motor controller or gateway.
In-Room Audio
Native in-room audio control — background music, volume, source selection, and scene integration all run on the same sBUS platform. No separate audio controller or amplifier gateway required.
Water Conservation
Smart G4 monitors and controls water flow at the room level — detecting leaks, managing hot water recirculation, and reporting unusual consumption patterns. All native on the sBUS platform.
VIP Self-Service Panels
World-first exclusive: guests request services with one touch at the room entrance — no phone call required. Housekeeping, minibar, laundry, taxi, and more. All requests are logged and routed to the correct department automatically.
Energy Management
Occupancy-based energy management across every room — HVAC setback, lighting off, curtain open for natural light, and standby mode on checkout. All driven by real occupancy sensors, not key-card assumptions.
Moonlighting Alert
World-first exclusive: detects and reports unauthorized room use via occupancy, HVAC, and water flow sensors. Alerts front desk and security in real time — no camera required.
Emergency Evacuation
Native emergency evacuation with room music override — the BMS broadcasts evacuation audio to every room simultaneously, overriding any in-room audio source. Integrated with fire alarm systems.
Direct Room Status Reporting
World-first exclusive: hardware-level automatic reporting of Room Clean & Ready, Room Needs Maintenance, and Laundry Picked Up — with zero manual entry by housekeeping staff.
BGM Multi-Zone Audio
Background music across all public areas — lobby, corridors, restaurants, pool, gym, and spa — managed from the same BMS dashboard as guestroom systems. Zone scheduling, volume control, and source selection all native.
Beyond the Guest Room
Every feature below is fully native and built-in — running on the same sBUS protocol, same hardware, and same software dashboard as the guest room system. No third-party integrations, no separate controllers, no middleware. One system. One bus. One platform.
Emergency Evacuation
Native sBUSNative emergency evacuation with room music override across all guestrooms simultaneously.
Elevator Floor Access Control
Native sBUSGuests can only access their registered floor — integrated with the GRMS key-card system.
Fire Marshal Occupancy Reporting
Native sBUSReal-time occupancy data per room and per floor — available to fire marshals during evacuation.
BGM Multi-Zone Audio
Native sBUSBackground music management across all public areas from the same BMS dashboard.
Facade Lighting
Native sBUSArchitectural facade lighting control — scenes, schedules, and event-triggered sequences.
Corridor Lighting
Native sBUSOccupancy-based corridor lighting — motion-triggered with configurable dim levels for night mode.
Gym & Spa Fresh Air
Native sBUSCO2-based fresh air and oxygen generation control for gym, spa, and wellness areas.
Parking Space Management
Native sBUSSensor-based parking space availability display and management integrated with the BMS.
Multi-Hotel Taxi Calling
Native sBUSCentralized taxi dispatch system with digital displays at each building entrance.
Predictive Maintenance SMS
Native sBUSAutomated SMS alerts to engineers when equipment approaches fault thresholds — before failure occurs.
GBMS Multi-City Management
Native sBUSManage multiple hotel properties across cities and countries from a single cloud dashboard.
AI Analytics
Native sBUSEnergy consumption analytics, occupancy pattern analysis, and predictive reporting across the entire property.
Observation Intelligence
Native sBUSAI-powered guest behavior and space utilization analytics via HeyOi.com integration — turning anonymized sensor data into actionable hospitality intelligence.
Non-Native Systems — Integrated via Open Protocol
These systems are not built into the Smart G4 sBUS platform but connect to it via open protocol bridges. Smart G4 coordinates and controls them from the same BMS dashboard — giving hotel operators a single point of management without replacing specialist third-party systems.
Front Desk & PMS Integration
3rd-Party IntegrationSmart G4 integrates with all major hotel Property Management Systems via open protocol — Opera, Fidelio, Protel, Mews, Cloudbeds, and others. Check-in/out automation, room status sync, and guest profile data flow between the PMS and the Smart G4 GRMS through a standard open protocol bridge. No vendor lock-in.
Shuttle Bus VIDS — Vehicle Identification Display System
3rd-Party IntegrationSmart G4 integrates with Shuttle Bus VIDS (Vehicle Identification Display System) — digital displays at each building entrance show which shuttle is arriving, its route, next departure time, and available seats. Connected to the Smart G4 BMS via open protocol for automatic, real-time updates across multi-building hotel complexes and resort campuses.
Digital & Advertising Signage
3rd-Party IntegrationSmart G4 integrates with leading digital signage platforms to manage advertising displays, wayfinding screens, promotional content, and event information across hotel lobbies, corridors, lifts, and public areas. Content scheduling, zone management, and emergency override are all coordinated through the Smart G4 BMS.
LED Large Displays — Ballrooms, Conference Halls, Restaurants & Clubs
3rd-Party IntegrationSmart G4 integrates with large-format LED display systems for hotel ballrooms, conference halls, restaurants, clubs, and outdoor facades. Lighting scenes, audio zones, and LED display content are synchronised through the Smart G4 BMS — one trigger sets the entire room ambience including the LED wall.
Hoteza IPTV & Video on Demand
3rd-Party IntegrationSmart G4 integrates with Hoteza — the leading hotel IPTV and Video on Demand platform. Guests access hotel services, TV channels, VOD content, room controls, and concierge requests from the in-room TV screen. The Smart G4 GRMS and Hoteza share guest status data so the TV experience is personalised from check-in.
HeyOi — Observation Intelligence Platform
3rd-Party IntegrationSmart G4 partners with HeyOi.com to bring AI-powered observation intelligence to hotel operations. HeyOi's platform analyses anonymized sensor and behavioral data from the Smart G4 GRMS — turning occupancy patterns, space utilization, and guest flow data into actionable hospitality intelligence. Hotel operators gain real-time dashboards showing which areas are underused, when peak demand shifts, and where service bottlenecks occur — all without cameras or personal data collection.
PMS & Third-Party Integration
Smart G4 GRMS integrates with all major hotel Property Management Systems and third-party building systems via our open protocol bridges — 38+ supported protocols with no vendor lock-in.
Energy Saving That Thinks Before It Acts
Smart G4 GRMS goes beyond key-card switching. Every energy decision is driven by real occupancy, real conditions, and real-time data — protecting guest comfort while eliminating waste across guestrooms, ballrooms, and corridors.
Ballroom People-Counter Fresh Air Control
A ballroom running full fresh-air injection for a half-empty event drains the hotel's chilled water and boiler water — reducing comfort in guestrooms and restaurants on every other floor. Smart G4 solves this with a bidirectional people counter on up to two entrances simultaneously.
How it works
The result: a 500-person ballroom with 80 guests injects fresh air for 80 people — not 500. The central chilled water plant is not monopolised, and every other hotel area maintains its designed comfort level.
Fan Speed as a Cooling Buffer
Stagnant air feels warmer than moving air at the same temperature. Smart G4 exploits this by increasing fan speed first when the room temperature begins to rise — improving perceived comfort without opening the coolant valve at all.
Two-stage response
Temperature rises → Fan speed increases
Air movement raises the effective comfort threshold. Compressor stays off. Fan uses a fraction of compressor energy.
Still rising → Coolant activates
Only when fan speed alone is insufficient does the compressor engage — as a second-stage response, not a first reflex.
Energy saved
Compressor activations reduced — especially in moderate climates and transitional seasons
Equipment life
Fewer compressor start cycles across hundreds of rooms means lower maintenance costs over years
Deep Dive: Smart G4 Hotel GRMS Intelligent Energy Saving
21-section technical guide — occupancy logic, ballroom people counters, fan-speed buffering, SMS engineer intelligence, night mode, PMS checkout, corridor lighting and more
Observation Intelligence — Powered by HeyOi
Smart G4 partners with HeyOi.com to layer AI-powered observation intelligence on top of the GRMS sensor network — turning anonymized occupancy and behavioral data into actionable hospitality insight, without cameras or personal data collection.
What HeyOi Adds
AI analytics layer on top of Smart G4 sensor data
The Smart G4 GRMS already collects rich occupancy, HVAC, lighting, and service-request data from every room and public area. HeyOi's observation intelligence platform ingests this anonymized data stream and applies machine learning to surface patterns that no human operator could spot manually — across hundreds of rooms, in real time.
Space utilization analytics
Which areas are underused, overloaded, or misaligned with booking patterns
Guest flow intelligence
Peak demand shifts, bottleneck detection, and service timing optimization
Behavioral pattern recognition
Anonymized occupancy trends that improve housekeeping scheduling and staffing
Predictive hospitality insights
Anticipate service demand before it becomes a complaint or a queue
No Cameras. No Personal Data.
HeyOi's observation intelligence is built entirely on anonymized sensor signals — occupancy presence, motion, HVAC state, lighting state, and service requests. No video feeds, no facial recognition, no guest identity data. GDPR-compatible by design.
How the Integration Works
Smart G4 GRMS sensors collect occupancy, HVAC, lighting, and service-request events across every room and public area
Anonymized event data is streamed to the HeyOi platform via secure API — no guest names, no room numbers in the data feed
HeyOi applies machine learning models trained on hospitality behavioral patterns to identify trends and anomalies
Hotel operators receive real-time dashboards and scheduled intelligence reports — actionable, not just informational
Visit HeyOi.com
Technology partner — Observation Intelligence Platform
BMS Engineer Intelligence
The Engineer Who Can Be Anywhere
Today, a BMS engineer sits at a desk watching monitoring screens and reading system logs — hour after hour. It is monotonous work, and it requires more manpower than most hotels can justify. Smart G4 changes this.
Without Smart G4
- ✕Engineer stationed at desk — watching screens continuously
- ✕Logs reviewed manually — faults noticed only when visible on screen
- ✕Response requires physical presence in the building
- ✕Multiple engineers needed to cover shifts around the clock
- ✕No documented record of who decided what and when
With Smart G4 SMS Intelligence
- BMS monitors continuously — engineer is alerted only when a decision is needed
- SMS sent directly to the engineer with the situation and available options
- Engineer replies from anywhere — another floor, another city, another country
- If no reply within timeout, BMS executes the pre-agreed intelligent default
- Every alert, reply, and action logged with timestamp and engineer identity
Example SMS Exchange
BMS → Engineer
Chiller 2 approaching high-pressure limit. Current: 94% of threshold. Options: (1) Reduce load on floors 4–7, (2) Switch to Chiller 3 standby, (3) Acknowledge and monitor. Reply 1, 2, or 3.
Engineer → BMS
2
BMS → Engineer (confirmation)
Action taken: Chiller 3 activated. Chiller 2 load reduced. Floors 4–7 stable. Logged 14:32.
If the engineer does not reply within the configured timeout, the BMS executes the pre-programmed intelligent default and sends a follow-up confirmation — the hotel never waits, and the engineer is always informed.
Remote control
Respond from anywhere in the world
Faster response
Seconds vs. minutes of travel time
Full audit trail
Every decision logged with identity
Intelligent fallback
Pre-agreed default if no reply
Ready to Automate Your Hotel?
Contact our hospitality team to discuss your GRMS project requirements — from a single property to a multi-site rollout.
Explore Hotel Solutions In Depth
Detailed pages for every aspect of Smart G4 hotel automation.
Smart G4 Hotel Difference
Why choose Smart G4 over competitors
Explore →GRMS Series
11 series from $75/room
Explore →Hotel RCU
Room Control Unit — the brain of GRMS
Explore →Elevator & Parking
Floor access control and parking management
Explore →Advertisement & Signage
Digital signage and in-room media
Explore →Hotel BMS
Full building management system
Explore →My Hotel Wishes
Complete automation checklist
Explore →Hotel Solutions & Ideas
Ideas for every hotel type
Explore →