Product Overview
MODBUS DTU439S (HADTU439S)is a powerful industrial grade network serial port conversion module that provides both RS485 and RS232 interfaces. It supports parallel conversion of serial port datato four network protocols: TCP, MQTT, UDP, and HTTP. Built in Modbus RTU ↔ The Modbus TCP transparent gateway function is the core bridge that connects traditional Modbus devices with Home Assistant and IoT cloud platforms.To four network protocols: TCP, MQTT, UDP, and HTTP. Built in Modbus RTU ↔ The Modbus TCP transparent gateway function is the core bridge that connects traditional Modbus devices with Home Assistant and IoT cloud platforms.
Four channel parallel architecture
| Channel | Protocol | Applicable scenarios |
|---|---|---|
| TCP Server/Client | TCP/IP | Serial devices connected to Ethernet, upper computer software directly connected |
| MQTT | MQTT v3.1.1 | connected to IoT platforms (HA/AWS IoT/Alibaba Cloud IoT) |
| UDP | UDP | Low Latency Broadcast Communication |
| HTTP Client | HTTP GET/POST | Trigger Webhook or REST API Call |
Core Function
- Dual Serial Ports: 1 RS485+1 RS232, Can Work Simultaneously
- Modbus Gateway: Modbus RTU ↔ Modbus TCP bidirectional transparent conversion, HA Modbus TCP integration directly uses
- MQTT bridging: serial data is automatically published to MQTT topics, HA receives
- RST resetthrough MQTT integration: short press to restart the device, long press to restore factory settings (for easy debugging)
- web configurationBuilt in web configuration page, allowing the browser to directly set parameters
HA integration
Recommended solution: Modbus RTU device → DTU439S (TCP mode) → Modbus TCP integration in HA. Just add Modbus TCP configuration in HA configuration.yaml, pointing to the IP+port of DTU439S.
Technical Specifications
- Power supply: DC 5-36V wide voltage
- Network: RJ45 10/100M
- Serial port parameters: baud rate 2400-460800, data bits/checksum/stop bits can be set
- Working temperature: -40~85 ° C
- Installation: DIN rail
🛒 Purchase and Consultation
The MODBUS products introduced in this article can be purchased through official channels.
📍 Modbas Intelligence|12th Floor, Tower A, Langqing Plaza, Guanyin Bridge, Jiangbei, Chongqing, China
📞 Phone:+86-18801054468
📧 Email: iot@modbus.com | 🌐 Official website:www.modbus.cn
📱 Search for "Modbus Debugging Assistant" on WeChat Mini ProgramModbus Debugging Assistantto learn more about product information
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