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WSAL21968 – RS485 TO WIFI – ETH/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 guide for the Waveshare module that converts a serial RS485 interface into an IP-based network via Wi-Fi or Ethernet and can forward Modbus data over MQTT.

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Technical overview

  • The module provides an RS485 interface and connects it to an IP network via Wi-Fi or an Ethernet port.
  • It supports forwarding Modbus data over MQTT.
  • One FAQ answer lists the default module IP as 10.10.100.254; another lists 10.10.110.254 – please clarify before commissioning.
  • A Windows host tool is available for configuration; it locates the device IP using port 48899 and keyword www.waveshare.com.
  • Wi-Fi operation: In AP mode up to 24 devices can connect; optimal range is about 50 m in open space with a 3 dBi antenna.
  • Ethernet operation: Two software variants exist – Z-Ver runs in bridge mode (devices on Ethernet get their IP from the AP); N-Ver runs in router mode (the module creates its own subnet, default 10.10.100.254).
  • For TCP/UDP communication, the client's remote IP and port must match the server's local IP and port; firewall settings should be checked.
  • Modbus communication: baud rate is typically set to 9600 or 115200 bps; device address and function codes must match the specific Modbus device.
  • Example Modbus RTU sequence from the source: transmit bytes 01 05 00 00 FF 00 8C 3A (function code 05, register 0x0000, value 0xFF00, CRC 8C 3A).
  • Power consumption: 12 V, 0.056 A, approximately 0.67 W average.

Commands and examples – verify before use:  

Senden (Modbus-Beispiel): 01 05 00 00 FF 00 8C 3A
Antwort (Modbus-Beispiel): 01 05 00 00 FF 00 8C 3A

Notes and version constraints

  • Default IP ambiguity: The source lists both 10.10.100.254 and 10.10.110.254 as defaults – please verify with the manufacturer.
  • Several places contain placeholder {{{5}}} instead of images; the associated steps are therefore only partially documented.
  • To restore factory settings, hold the Reload button for more than 5 seconds after power-on; exact behavior depends on firmware version.
  • If the configuration page cannot be opened: unplug the Ethernet cable or switch the port to LAN mode – the step depends on the firmware variant (N-/Z-Ver).
  • Security: Leaving the web-interface administrator password blank is possible, but setting account and password is recommended to avoid unauthorized access.
  • Automatic restart on network failure is configurable; exact parameters depend on the version.
  • The stated transmission distance (~50 m) applies only under ideal conditions (open area, 3 dBi antenna); real environments may perform significantly worse.
  • TCP/UDP troubleshooting includes checking firewall settings; temporarily disabling the firewall is for testing only.

Source and revision record

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