Intelligent Control System for Hotel Guest Rooms

Why Should Hotels Install Smart Systems?

• Enhance Guest Experience: Smart hotel systems improve guest experience through intelligent control of room lighting, curtains, air conditioning, music, and other devices.
• Reduce Operational Costs: Smart hotel systems can lower energy consumption costs, labor costs, and other operational expenses.
• Improve Management Efficiency: Smart hotel systems enable quick completion of guest check-in, check-out, and billing operations, thereby enhancing hotel management efficiency.
• Increase Guest Loyalty: Smart hotel systems can provide more personalized services, increasing guest retention.

● The following section primarily introduces the hotel room control system centered on LZBUS.

What is the LZBUS Single-Bus System?

The LZBUS is a long-distance, single-wire transmission bus with one master and multiple slaves. Systems communicating via the LZBUS can be referred to as LZBUS systems. An LZBUS system consists of one host and several nodes. The communication distance varies with cable thickness; using a 1 mm² cable, the communication distance can exceed 1500 meters.

The external wiring for the LZBUS includes a power line (VBUS), a signal line (S), and a ground line (GND). When the system bus load current is small (<2A), nodes can draw power from the bus, meaning communication requires only two wires (GND, S). Furthermore, nodes can be configured for non-polarized communication using a bridge rectifier, meaning the S and GND lines are not polarity-sensitive.

If the system load current is larger, a three-wire system can be used, allowing the total system load current to exceed 10A. This eliminates the need for individual power supply to each node, simplifying engineering wiring.

^{Schematic Diagram of LZBUS System}

▶ LZBUS System Communication Characteristics

The LZBUS system operates in a one-master-multiple-slaves mode (also supporting multi-master-multi-slave). The host polls the nodes to collect data from each node or control the switch output of the nodes.

During data acquisition, a single frame of instructions from the LZBUS host can collect data from up to 16 nodes with consecutive logical addresses. However, when using a two-wire communication system, it is recommended to collect data from a maximum of 4 nodes with consecutive logical addresses at a time.

Application Example 1–Data Transmission Networking Solution Based on LZBUS + Wireless

The system consists of 4G, LZBUS bus (including master and slave stations), and wireless nodes.
The LZBUS communicates with 4G/Ethernet via serial port. The master station communicates with each slave station via two wires. Each slave station is connected to a wireless data transmission module, communicating with the wireless nodes under its jurisdiction via the wireless module. Each slave station can communicate with its managed wireless nodes through address identification.
If there is overlapping communication coverage between wireless nodes managed by two adjacent slave stations, interference can be avoided by setting the wireless nodes of different slave stations to operate at different frequencies. This way, even if adjacent slave stations simultaneously query their managed modules, wireless conflicts will not occur.

Application Example 2–LZBUS Building Control Communication System

▶ Performance Comparison: LZBUS vs. Other Buses

• LZBUS supports multi-master, multi-slave bus architecture.
• LZBUS supports batch read/write operations, which others do not.
• LZBUS implements stricter anti-interference and safety measures.
• The system supports automatic node recognition; replacing a node does not require system reboot, simplifying maintenance.

▶ LZBUS Feature Specifications

• Communication Distance (m): 1500
• Communication Level: 24V for both uplink and downlink
• Maximum Bus Voltage: 28V
• Electromagnetic Compatibility: Strong
• Maximum Communication Rate at Longest Distance: Up to 3K (30K for new version)
• Wiring Method: Two-wire (can supply power)
• Power Supply Current: 2A
• Polarity: Non-polarized
• Chip Static Current Consumption: Approx. 2mA
• Load Capacity: <250 nodes
• Wiring Topology: Arbitrary branching
• Multi-Master Communication Capability: Yes
• Can Power Node Devices: Yes
• Bus Isolation Device: Available, moderate cost

✦ Introduction to Standalone Hotel Room Control System

The standalone room control system is the most widely used system in the current market. It is understood that the majority of four-star hotels, along with some five-star and three-star hotels, install this type of system.

The reasons are summarized in the following two points:
❶ Standalone room control systems are cost-effective and meet the needs of the vast majority of hotels.
❷ As the system is standalone and does not require networking with other manufacturers' equipment, installation is simple, and system performance is stable and reliable.

^{Topology Diagram of Standalone Hotel Room Control System}

⋆ Main Features of the Standalone System

• Centralized Low-Voltage Lighting Control:
  Utilizes residential-style centralized lighting control for convenient switching. When multiple lights are on, a master off button can turn off all lights and controlled sockets at once.
• Bathroom Exhaust Fan Timer Control & Auto-Sensing:
  Bathroom lights can be optionally configured as infrared sensor-activated lights, turning on automatically when someone is present, simultaneously activating the exhaust fan (optional). The fan features timed activation and delayed shut-off functions.
• Integrated Door Display:
  The door display integrates room number, doorbell switch, "Do Not Disturb," "Please Clean," "Please Wait," and other indicator lights and switches. When a guest presses the "Do Not Disturb" button inside the room, the doorbell is disabled. Pressing "Please Wait" illuminates the corresponding indicator on the door display. Pressing "Please Clean" illuminates the cleaning indicator.
• Air Conditioning Control:
  Combines wall-mounted thermostat switches with terminal intelligent control to manage indoor temperature and fan coil units. The system automatically switches to a low-speed, energy-saving mode after the guest leaves the room.

✦ Introduction to Networked Hotel Room Control System

The room control system is a network-based system using Ethernet communication. It employs TCP/IP protocol and can directly utilize the hotel's existing network cabling infrastructure to monitor and manage room status and information.

The entire system consists of two parts: upper-level computer centralized management platform software and intelligent room control hardware terminals. The centralized management platform database can use MS SQL Server or Oracle DB Server, ensuring system stability and reliability.
The room control system integrates intelligent lighting control, air conditioning control, service control, and management functions, characterized by intelligence, networking, and standardization.
The room control system is a network-based system using Ethernet communication. It employs TCP/IP protocol and can directly utilize the hotel's existing network cabling infrastructure to monitor and manage room status and information.
The entire system consists of two parts: upper-level computer centralized management platform software and intelligent room control hardware terminals. The centralized management platform database can use MS SQL Server or Oracle DB Server, ensuring system stability and reliability.
The room control system integrates intelligent lighting control, air conditioning control, service control, and management functions, characterized by intelligence, networking, and standardization.

Building upon the standalone system's features, the networked version adds connectivity functions with the housekeeping department or front desk. This enables signals such as guest SOS alerts, cleaning requests, check-out notifications, meal orders, "Do Not Disturb" status, occupancy detection, and indoor temperature to be transmitted to relevant departments. This significantly enhances guest comfort, safety, and convenience during their stay.

For air conditioning control, beyond standalone features, the hotel front desk can send control signals via the network when a guest checks in, allowing the room control terminal to pre-set the room temperature.
LZBUS modules can easily expand to include wireless sensor network interfaces, integrating wireless door/window sensors, wireless PIR motion sensors, wireless temperature/humidity sensors, physiological parameter monitoring systems (e.g., sleep quality), and other sensors that are inconvenient to wire or temporarily added, into the system for unified management.

^{Prototype Images of Wireless Switches and Wireless Sockets}

Hainan West-HN

Hainan West-HN Technology Co., Ltd., with the vision of "Making Standardization of Industrial IoT Simpler," focuses on the IoT industry chain. It continuously invests in R&D in indoor positioning, sensing control, and data transmission products. Adopting a "Lego-like" production approach, it precisely meets the small-batch, high-variety demand characteristics of industrial IoT products, providing solutions for complex environments and personalized needs, truly realizing a new supply-demand relationship with low inventory and high satisfaction.

The company has R&D centers in Shanghai, Suzhou, Chengdu, and Taipei. Upholding the group's nearly 40 years of strong business resources and reputation, it firmly believes in the business philosophy of "Being Experts in the Industry." It excels in channels, is sensitive to the market, focuses on products, ensures reliability in R&D, stability in production, and quality in sales, always dedicated to the ultimate satisfaction of industrial IoT customers' personalized scenario needs.

Regarding products, we have self-developed Zigbee positioning products cultivated by our team for over a decade, as well as UWB positioning products developed by teams in Shanghai and Taipei, meeting different customer requirements for positioning accuracy. Simultaneously, the company introduces Bluetooth positioning products to complement self-developed solutions, comprehensively fulfilling the needs of various customers.

In terms of software support, we integrate overall solutions across industries, actively open interfaces and source code for system integrators to join, and facilitate related software companies in creating case demonstrations based on our products, broadening the application of IoT indoor positioning.