WSAL24276 – UART TO ETH (B)/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The UART TO ETH (B) is a compact module that forwards TTL UART data bidirectionally and transparently between serial interfaces and Ethernet. It can serve as a serial server, Modbus gateway, or IoT gateway for industrial environments.

Related products at JW Tech

WSAL24276 – TTL UART to Ethernet Mini Module, Castellated Holes With Immersion Gold Design, Highly Integrated Packaging

Technical overview

Serial specification: baud rates from 300 to 115200 bps, data bits 5–9, selectable parity (none, odd, even, mark, space), hardware flow control supported.
Network protocols: supports TCP server, TCP client, UDP, and UDP multicast; up to 30 simultaneous TCP connections in server mode and 7 destination IPs in client mode.
Pinout includes 5V/3.3V power, RST (active-low, minimum 100 ns pulse), TXD/RXD (3.3 V TTL), DEF (hold low >1 s to reset to default IP 192.168.1.254), RUN indicator, EN (RS485 transmit enable), RTS/CTS for flow control, and LINK/ACT/LINK2 status indicators.
Configuration is done via web browser or the provided DLL development library; DHCP and DNS are supported.
Advanced functions include Modbus RTU-to-TCP gateway, MQTT gateway, JSON-to-Modbus/IEC-645 conversion, NTP time synchronization, user-defined heartbeat/registration packets, and HTTP GET/POST for data submission.
Operating temperature range is -40 °C to 85 °C; humidity range is 5 % to 95 % relative humidity.
Module dimensions are 34 × 23 × 11.5 mm; it features castellated holes with immersion gold for direct PCB integration.

Notes and version constraints

The exact default IP after reset (192.168.1.254) applies only to this model; other variants may use different values.
PoE connection requires a PoE splitter to separate power and data; connecting directly to a PoE switch without isolation can damage the module.
For Modbus operation, function code compatibility with the connected device must be verified; the correct baud rate should be read from the device.
Password change via the web interface: after changing, login is possible only with the new password.
Some steps depend on the firmware version; consult the latest manufacturer documentation when uncertain.

Source and revision record

UART TO ETH (B) - Waveshare Wiki
Source revision: 96473
Captured: 2026-09-04T04:06:49+00:00
SHA-256: ae44f9e6343b941f4077bb6bc4ae72e9e3ed0c5db4cd26ec0c7252e68489ab53