What does a wireless DTU do?

It transmits data from field devices such as RS485 sensors, meters and controllers over a radio network instead of a wired cable, while keeping the original device protocol - in this case Modbus RTU or Modbus TCP - transparent to the host software.

How is HaLow different from normal Wi-Fi?

HaLow (IEEE 802.11ah) works in Sub-1 GHz spectrum rather than 2.4 GHz, so signals travel further and pass obstacles better. The KF-DTU Gen1 reaches up to 500 m point-to-point while still offering 2, 4 or 8 Mbps selectable bandwidth.

Can one DTU expand to nearby points?

Yes. Each KF-DTU Gen1 can carry up to 8 x 2.4G micro terminals, which lets a node serve a small cluster of nearby points without installing a full DTU at every single point.

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What is a wireless DTU and how does Wi-Fi HaLow change RS485 networking?

1. Overview and Definition

A wireless DTU (data transmission unit) moves serial or Ethernet field data over a radio link instead of a cable. Traditionally, RS485 devices such as meters, sensors and controllers are chained by wired cable to a gateway. A wireless DTU like the KF-DTU Gen1 by Jingfu Communication keeps the same device protocols but replaces the long cable runs with a radio mesh, which changes installation cost, site reach and maintenance.

2. Standard and Requirements

The KF-DTU Gen1 uses Wi-Fi HaLow (IEEE 802.11ah) Sub-1 GHz with selectable bandwidth of 2, 4 or 8 Mbps. Field requirements it is built for: RS485 and Ethernet device access, Modbus RTU/TCP transparent transmission, outdoor IP65 installation, and DC 4.7-16V power. Operating frequency is configured for the destination market and confirmed in writing before quotation and shipment.

3. Core Structure

Each node combines the HaLow radio, the self-developed Mesh stack, RS485 and RJ45 interfaces, and management by Web, AT commands and CLI/JSON. Nodes relay for each other across up to 10 hops in star, chain, ring or mesh hybrid topologies, forming one private on-site network for 50+ nodes and 500+ sensors.

4. Performance and Deployment Notes

Point-to-point range is up to 500 m and a single hop passes through 4 floors, with millisecond forwarding across hops. Compared with wired RS485, the practical gains are: no trenching, easy extension by adding a node, and coverage of sites where cable routes do not exist. Plan node positions first, then poll every device end to end during acceptance.

5. Buyer FAQ

Does the application software change? Usually not: Modbus polling stays the same because transmission is transparent. Is a public network needed? No: the mesh is a private on-site network and data stays on site. How many devices can one network carry? 50+ nodes and 500+ sensors per network.

6. Supplier Capability

Jingfu Communication manufactures the KF-DTU Gen1 and Simiai Technology acts as authorized export representative in Shenzhen, China. Partners receive RFQ-based quotation, sample coordination via RFQ, and type-approval documentation and test support available on request. Contact Mr. Heming Wang on WhatsApp +86 130 7787 8567 or at hemingwang@simiai.top.

7. Conclusion

A HaLow wireless DTU changes RS485 networking from a cabling project into a node-placement project: same protocols, same devices, but a private mesh instead of long cable runs. Start with the specifications, then request an RFQ via trade and contact.

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Chat on WhatsApp: +86 130 7787 8567 Email Us: hemingwang@simiai.top