Advanced Digital Thermostat for FCU Systems & HVAC Control The FT-06 digital thermostat is a high-performance control solution specifically designed for fan coil units (FCU) and heating applications. Whether for hotels, commercial offices, or modern residential environments, this FCU room thermostat provides precise management of fans, valves, dampers, and electric heaters.   For large-scale building automation, our Modbus RTU thermostats (Baud rate: 9600) are the premier choice for seamless integration with BMS systems. Additionally, we offer a smart solution featuring a 2.4GHz WiFi module, allowing users to remotely monitor and program their smart room thermostat via the Tuya Smart Life App from anywhere in the world.   Key Features & Smart Connectivity Options The FT-06 is highly customizable to meet specific project requirements. Its intuitive press-button interface and clear Digital LCD display show real-time room temperature and setpoints at a glance. Versatile System Support: Compatible with both 2-pipe and 4-pipe systems. Precision Modulation: Optional 0-10V output for advanced valve and fan speed control. Climate Modes: Easy switching between Cool, Heat, and Fan modes. Fan Management: 3-speed fan control (High/Med/Low) plus Auto-Fan mode for optimal comfort. Energy Management: Optional Keycard (Hotel energy saving), Clock, and External Sensor support. Industry Protocols: Supports Modbus RTU, BACnet, and WiFi connectivity for smart building integration.   Technical Specifications & Installation As a professional manufacturer, Xiamen E-top Controls ensures every FT-06 thermostat meets rigorous industrial standards for reliability and accuracy:   Supply Voltage: AC24V; AC85-260V / 50-60Hz Temperature Sensor: High-precision NTC 10K Setpoint Range: Default 5~35℃ (Adjustable) Control Accuracy: ±1℃ (Backlight: White) Control Performance: ON/OFF Control or Modulating (0-10V) Thermostat Output: SPST relay for 2-pipe / 2 SPST relays for 4-pipe Switch Current Rating: 5A (Resistive) / 2A (Inductive) Protection Class: IP30 (Dust-proof) Mounting: Embedded mounting, standard 86*86mm junction box   Why Choose E-top Controls? With over 17 years of experience, Xiamen E-top Controls is a leading provider of OEM/ODM thermostat services worldwide. We specialize in creating customized climate control solutions that balance energy efficiency with user comfort.   Looking for a reliable FCU thermostat supplier for your next project? [Contact Us Today for a Quote or Customization Details!]

The main differences between Modbus TCP and Modbus RTU are their communication mode, data transmission mode, data format, reliability, network topology and verification mechanism. 1   Communication mode: Modbus RTU (Remote Terminal Unit) uses asynchronous serial transmission and can communicate through various media (such as wired RS-232/422/485, optical fiber, wireless, etc.), which is suitable for point-to-point or multi-point-to-point topology. Modbus TCP is based on Ethernet communication and uses TCP/IP protocol. It is suitable for star or bus network topology. The device is connected to the master station through an Ethernet switch or router.   Data transmission mode: Modbus RTU transmits data directly through binary data, while Modbus TCP converts each byte of binary data into a fixed two-bit hexadecimal string, and then concatenates them in sequence to transmit data in the form of TCP code.   Data format: The data format of Modbus RTU includes fields such as start character, slave address, function code, data, and error detection. The data format of Modbus TCP is TCP/IP data packet, which contains fields such as source IP address, destination IP address, TCP port number, Modbus application data unit (ADU), etc.   Reliability: Modbus RTU uses differential signal transmission at the physical layer, has good anti-interference ability, and is suitable for industrial environment. Modbus TCP uses the reliability mechanism of TCP/IP to retransmit data packets, and has high requirements for the network environment.   Verification mechanism: Modbus RTU performs CRC16 verification on the sent and received messages during the transmission process to ensure that there are no errors or damage to the data during the transmission process. Modbus TCP does not have verification when sending, but does verification at the transport layer.   In summary, Modbus RTU is more suitable for industrial field environments, with shorter transmission distances and stronger anti-interference ability; while Modbus TCP is suitable for local area network or wide area network environments, with longer transmission distances, but with higher requirements for the network environment.   As room thermostat manufacturer, E-Top provide widely range of Modbus RTU thermostat. If Modbus TCP need, we can accept OEM/ODM development.    

When you’re planning an HVAC project, especially for commercial buildings, one of the first questions that comes up is: should we go with BACnet or Modbus for the thermostats? Both protocols have been around for a long time and both run on RS485, but they are quite different in practice. Here’s a simple breakdown to help you decide.   The Key Differences: BACnet MS/TP vs. Modbus RTU BACnet MS/TP Thermostat is generally considered the standard for building automation. It’s stronger when you have a large project with equipment from multiple brands (such as Siemens, Honeywell, or Schneider). It offers better interoperability, meaning the Building Management System (BMS) can “see” and self-discover devices more easily. However, it usually takes more time and technical effort to set up properly. Modbus RTU Thermostat is simpler and more cost-effective to implement. A lot of integrators and smaller projects prefer it because you can get the system up and running faster. The downside is that it requires more manual work for register mapping—it’s not as “plug-and-play” as BACnet when mixing different manufacturers.   How to Choose Based on Your Project Scale In real projects, I’ve seen many cases where people chose BACnet for big hotel or office building projects because they needed reliable, multi-vendor integration. On the other hand, for small to medium commercial buildings or retrofit jobs, Modbus is often the more practical choice due to lower cost and faster deployment.   Flexible Solutions from E-Top Controls So what does E-Top offer? Most of our FCU Thermostats support both BACnet MS/TP and Modbus RTU, sometimes even in the same model series. For instance, our FT-CS03 Smart FCU Thermostat is a versatile solution that features a color screen and works with Amazon Alexa and Google Assistant, while supporting these key protocols. This gives our customers more flexibility. You don’t have to compromise—you can choose the protocol that best fits your project’s size, budget, and integration requirements. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- Frequently Asked Questions   Q1: What is the main difference between BACnet MS/TP and Modbus RTU thermostats? A: BACnet MS/TP is designed for large building automation with high interoperability, while Modbus RTU is simpler and more cost-effective for smaller HVAC projects.   Q2: Which protocol is better for large commercial buildings? A: BACnet MS/TP is usually the better choice for large commercial projects because it integrates easily with various Building Management Systems (BMS).   Q3: When should I choose Modbus RTU for my HVAC project? A: Modbus RTU is ideal for simple, budget-conscious projects or retrofitting older systems where complex integration isn't required.   Q4: Does E-Top offer thermostats that support both BACnet and Modbus? A: Yes, E-Top provides versatile FCU thermostats like the FT-CS03 series that support both protocols for maximum flexibility.