Waveshare RS485-to-Ethernet Serial Server (C) – 6–36 V, Isolation, DIN-Rail

The Waveshare RS485-to-Ethernet Serial Server (Variant C) securely bridges RS485 devices to IP networks. It provides transparent TCP/IP↔RS485 transmission, acts as a Modbus gateway and an MQTT/JSON gateway, and comes in a compact DIN-rail enclosure. Variant C operates from 6–36 V DC, features electrical isolation, and uses a common Ethernet port (no PoE).

Key Features

• Bi-directional transparent data between RS485 and Ethernet
• Gateways: Modbus RTU↔TCP, MQTT (Baidu/Alibaba/OneNet, etc.), RS485→JSON (HTTP/MQTT POST/GET)
• Operating modes: TCP server, TCP client (coexisting), UDP, UDP multicast, VCOM
• 6–36 V DC input, power & signal isolation (C variant), DIN-rail mounting
• 10/100M RJ45 with 2 kV surge protection
• Web configuration, DHCP/DNS, NTP, user-defined heartbeat/registration
• Multi-host polling without crosstalk

Technical Specs (Variant C)

• Interfaces: RS485 (isolated) ×1, Ethernet (RJ45) ×1
• Serial: 300–115200 bps; 5–9 data bits; parity none/odd/even/mark/space
• Protocols: Ethernet/IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS
• Configuration: host tool, web browser, device management library
• Operation: TCP server/client (coexist), UDP/multicast, VCOM
• Power: 6–36 V DC (screw terminal)
• Isolation: power + signal (C variant); RJ45 2 kV surge
• Environment: −40 to +85 °C; 5%–95% RH
• Dimensions (C): approx. 88.7 × 72.5 × 24.2 mm

Notes

• This page covers Variant C (RS485 TO ETH (C)) – no PoE.
• For PoE, see RS485 TO POE ETH (B).
• Please check the variant/power label on the device.

Item Info

• SKU: 30303  |  Part No.: RS485 TO ETH (C)  |  Brand: Waveshare

Documentation

WIKI: www.waveshare.com/wiki/RS485_TO_ETH_(C)