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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL21968 WSAL21968 – Rail-Mount Serial Server, RS485 to WIFI/Ethernet Module, Modbus MQTT Gateway]

== 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:'''
<syntaxhighlight lang="text">
Senden (Modbus-Beispiel): 01 05 00 00 FF 00 8C 3A
Antwort (Modbus-Beispiel): 01 05 00 00 FF 00 8C 3A
</syntaxhighlight>

== 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 ==
* [https://www.waveshare.com/wiki/RS485_TO_WIFI/ETH RS485 TO WIFI/ETH - Waveshare Wiki]
* Source revision: 106546
* Captured: 2026-09-03T03:28:44+00:00
* SHA-256: <code>fc146065f3e591fcc8d6fbcc83aa175b97bb53e7a4b030b846a22bce17c81d02</code>

WSAL21968 – RS485 TO WIFI – ETH/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex