RS232/485/422 to RJ45 Ethernet Module Waveshare Serial Server with PoE

Description

Product Overview

The Waveshare RS232/485/422 to RJ45 Ethernet module is engineered for demanding industrial environments where reliable, high‑speed data exchange is essential. Combining a MediaTek MT8125 processor with DDR4 memory running at 300 MHz, the device delivers fast packet handling and low latency across TCP, UDP, MQTT and Modbus protocols. Its dual‑mode PoE capability conforms to IEEE 802.3af, allowing power delivery directly through the Ethernet cable, while a separate DC input (5.5 mm × 21 mm) supports 6‑36 V for flexible installation. The compact 4.21 × 3.15 × 1.1 in chassis fits standard 19‑inch rack rails, and the front panel hosts RJ45, RS232, RS485 and RS422 connectors, each with screw‑terminal options for secure wiring. The module runs a hardened Linux operating system, providing a stable foundation for custom scripts, remote firmware updates, and secure NTP time synchronization. Detailed specifications include a 5.3‑ounce weight, a single‑core processor, and a best‑seller rank of #2 in the Serial Port Cards category, reflecting strong market acceptance and positive customer reviews.

Usage

Designed for data acquisition, intelligent instrument monitoring, and IoT gateway applications, this serial‑to‑Ethernet converter excels in factories, utility substations, and remote sensor networks. In a manufacturing line, the module can aggregate temperature, pressure and vibration data from legacy RS485 sensors, encapsulate the readings in MQTT messages, and push them to a cloud broker for real‑time analytics. In a power distribution setting, the device can act as a Modbus TCP server, allowing SCADA systems to poll multiple RTUs without rewiring existing RS232 interfaces. Its bi‑directional transparent transmission ensures that commands issued from a supervisory PC reach field devices without alteration, while responses travel back unchanged, preserving protocol integrity. The PoE feature simplifies deployment in cramped control cabinets where separate power lines are impractical; a single Ethernet cable supplies both data and power, reducing cable clutter and installation time. The module also supports UDP multicast for efficient firmware distribution across fleets of devices, making it a versatile component in large‑scale IoT roll‑outs.

Why Choose Us

Waveshare brings over a decade of experience in industrial electronics, and this serial server reflects the company’s commitment to quality, reliability and customer support. Every unit undergoes rigorous thermal cycling, vibration testing and electromagnetic compatibility verification to meet IEC 61000 standards, ensuring operation in harsh environments where temperature swings from -40 °C to +85 °C are common. The open‑source Linux firmware provides transparency and extensibility; users can modify the source code, add custom protocol handlers, or integrate proprietary security modules without licensing constraints. Waveshare’s technical support team offers 24/7 assistance, firmware patches and detailed integration guides, reducing time‑to‑market for system integrators. Additionally, the product is backed by a one‑year warranty and an optional extended service plan that includes on‑site troubleshooting and priority firmware updates. By choosing this module, customers gain a future‑proof solution that scales from a single sensor node to a network of hundreds, all while maintaining low total cost of ownership.

Key Features

• Plug‑and‑play PoE support eliminates separate power supplies, simplifying wiring and reducing installation costs.
• Bi‑directional transparent transmission preserves original protocol data, ensuring compatibility with legacy equipment.
• Multi‑protocol engine handles TCP, UDP, MQTT and Modbus, providing flexibility for diverse industrial applications.
• Robust Linux firmware with OTA updates guarantees long‑term security and feature enhancements.
• Dedicated Waveshare support team offers rapid response, detailed documentation and optional on‑site service.

FAQ

Can the module be powered solely by PoE?

Yes, the device fully complies with IEEE 802.3af PoE standards, allowing it to receive up to 15.4 W over the Ethernet cable. This eliminates the need for an external power adapter in most installations, though a DC input is available for environments that require higher voltage ranges.

What serial protocols are supported?

The module supports RS232, RS485 and RS422 interfaces, each configurable for baud rates from 1200 bps up to 115200 bps. It can operate in TCP server, TCP client, UDP unicast, UDP multicast, and MQTT modes, providing seamless integration with a wide range of legacy and modern devices.

Is the firmware customizable?

Yes, the underlying Linux operating system is open source. Users can access the source code, add custom scripts, or integrate third‑party libraries to tailor the device to specific application requirements. Firmware updates are delivered over the network via secure OTA mechanisms.

How does the device handle network time synchronization?

The module includes an NTP client that can query external time servers to obtain accurate timestamps. These timestamps can be embedded in serial data streams or used for scheduled tasks such as heartbeat packets and data logging.

What warranty and support options are available?

Each unit ships with a one‑year limited warranty covering manufacturing defects. Waveshare also offers an optional extended service plan that provides priority technical support, on‑site assistance, and guaranteed firmware updates for up to three years.