WSAL20978 – RS485 TO ETH (C)/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.

Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional)

Catalog location in the JW Tech Shop:

• WSAL20978 – Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional): Other products
• WSAL23273 – Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional): IoT / Communication → Wired Comm / Converter → Ethernet TO UART / RS232 / RS485
• WSAL30303 – Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional): Other products

Summary

The Waveshare RS485 TO ETH (C) is an industrial serial server enabling bidirectional transparent data transmission between an isolated RS485 port and an RJ45 Ethernet port. It supports TCP/IP, Modbus gateway functions, MQTT, and configuration via a web browser or the VirCom software.

Related products at JW Tech

• WSAL20978 – Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional)
• WSAL23273 – Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional)
• WSAL30303 – Industrial serial server, RS485 to RJ45 Ethernet, TCP/IP to serial, rail-mount support, with POE function(optional)

Technical overview

• Power supply via screw terminal: 6–36 V DC; signal and power isolation present.
• Serial parameters: baud rate 300–115200 bps, 5–9 data bits, parity none/even/odd/mark/space; no flow control.
• Ethernet port: 10/100M self-adaptive RJ45 with 2 kV surge protection.
• Operating modes: TCP server (up to 30 connections), TCP client (up to 7 destination IPs, coexists with TCP server), UDP and UDP multicast.
• Modbus gateway: converts Modbus RTU to Modbus TCP; supports storage and non-storage modes for automatic data collection and storage.
• MQTT gateway and HTTP POST/GET data delivery to cloud systems; NTP time synchronization for timestamped protocol content.
• Web configuration via browser, DHCP for dynamic IP assignment, DNS resolution of domain addresses.
• Dimensions: 87 × 36 × 59 mm; DIN-rail mounting supported.
• Application cases: IoT gateway for RS485 sensors, electricity metering/energy monitoring, remote PLC maintenance, networking access-control systems.

Notes and version constraints

• The source contains placeholders such as {{{name3}}} and {{{userDefinedInfo}}}, indicating incomplete templates; exact product designations should be manually verified before publication.
• The source mentions both versions (C and B); this guide focuses on the C version, but some test sections explicitly refer to the B version – the exact hardware wiring differences should be confirmed against the physical device.
• The '10/100M self-adaptive' specification is clarified in the FAQ as actually being limited to 10 Mbit/s serial throughput; this should be stated more clearly in the wiki to avoid misunderstandings about effective throughput limits.
• The source does not contain exact command strings or configuration commands; therefore the 'commands' field is left empty. If specific CLI or API commands are needed, they must be supplemented from official documentation.

Source and revision record

• RS485 TO ETH (C) - Waveshare Wiki
• Source revision: 104219
• Captured: 2026-08-29T08:14:58+00:00
• SHA-256: 7e739ed4a8467955ae0447f37a9cd6f14310914a1fcb584ddd3383db5c64ad53