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WSAL20978 – RS485 TO ETH (B)/en

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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

Technical overview of the Waveshare industrial RS485-to-Ethernet serial server: hardware connections, configuration, and test procedures.

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Technical overview

  • Two hardware variants: RS485 TO ETH (B) uses a standard Ethernet port with 9–24 V power via terminal block; RS485 TO POE ETH (B) adds PoE, 6–36 V supply, and electrical isolation.
  • Connections: RS485 interface (A/B), RJ45 Ethernet port, power terminals. Serial link is made through a USB-to-RS485 adapter or direct device connection.
  • LED indicators: PWR shows power status. LINK glows green when a cable is connected and blue when a TCP/UDP session is established. ACT lights green for network-to-serial transmission and blue for serial-to-network return data.
  • Software features: TCP server (up to 30 connections), TCP client (up to 7 destination IPs), UDP multicast, DHCP, DNS, HTTP, Modbus gateway (RTU to TCP), MQTT gateway, JSON formatting, and NTP time sync.
  • Configuration is done via web browser or VirCom software. Virtual COM ports are created with the driver; if virtual ports are not needed, the free configuration utility suffices.
  • Test setup: connect a PC with a USB-to-RS485 adapter to the RS485 device, run a network cable between the server and PC/switch. Use VirCom to discover and configure the device on the same switch segment.
  • TCP test: configure one SSCOM window as a TCP client targeting IP 192.168.1.200 port 4196. Data is forwarded transparently between the RS485 device and the PC.
  • The Modbus gateway supports storage mode (automatic collection and storage) and non-storage mode. Multi-host behavior also allows several computers to query the same serial device simultaneously.
  • Operating conditions: temperature range -40 °C to 85 °C, humidity 5 % to 95 % relative humidity.
  • Suitable for industrial data acquisition, IoT gateway use cases, remote monitoring of automation PLCs, and networking access-control systems.

Commands and examples – verify before use:  

VirCom – Device Management
SSCOM TCPClient: Waveshare Test
SSCOM TCPClient target IP 192.168.1.200 port 4196

Notes and version constraints

  • The source contains no explicit command-line interface commands; the listed “commands” refer only to software dialogs from the quick-test section.
  • The specific IP value (192.168.1.200) is an example from the test section; actual IP depends on network configuration and must be verified on site.
  • PoE power is only available on the RS485 TO POE ETH (B) variant; the base variant requires an external 9–24 V power source.
  • Compatibility with gigabit switches is limited: the device supports 10 Mbps or 100 Mbps Ethernet; some gigabit switches may be incompatible.
  • All feature claims come from untrusted supplier material; critical integration steps (e.g., Modbus gateway setup, MQTT bridge) should be confirmed by a specialist.

Source and revision record

  • RS485 TO ETH (B) - Waveshare Wiki
  • Source revision: 109931
  • Captured: 2026-08-29T08:13:45+00:00
  • SHA-256: 99ed3653d22e09a384af3c81ac3a647a664b02c54d20a22f8a37acf9163f0fea
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