SLZB-xxU and ZWA-2

???? Using ZWA-2 Z-Wave Dongle with SLZB-MR1U via USB Passthrough

Overview

Many users have asked whether the ZWA-2 Z-Wave USB stick can be used with the SLZB-MR1U throughusing its USB passthrough over Ethernet feature.

Until now,recently, we were unable to confirm compatibilitythis — as weit had not yetbeen tested this specific configuration.in-house.

We have now tested thethis setup with the latest firmware,setup, and we arecan happy to report that:confirm:

✅ ZWA-2 works perfectlyreliably with SLZB-MR1U over Ethernet using USB passthrough.

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✅???? What You Need

• SLZB-MR1U (hardware)hardware

• SLZB-OS firmware v3.0.0 firmwareor newer

• ZWA-2 USB Z-Wave USB stick

• Z-Wave JS UI (or othercompatible Z-Wave software that supports TCP/IP serial passthroughintegration)

• Network accessAccess to the SLZB-MR1UMR1U's IP address on your local network

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???? Why SLZB-OS v3.0.0?

We recommend usingFirmware SLZB-OS v3.0.0 (released 29 August 2025) because:includes:

• It✅ Fix for resolves previous issues with USB passthrough stability

• It✅ Fix for fixes EFR32 firmware flashingupdate problemsfailures (Thread radio)

• It’s???? General improvements for SLZB-MR1U reliability

It is the first firmwarerecommended version tofor officially support stableusing external USB devices likewith ZWA-2 on MR1UMR1U.

???? Update options:

• OTA (if available), or

• Manual update via USB-C using the Web Flasher:
  ???? Download SLZB-OS v3.0.0https://smlight.tech/flasher/#SLZB-06U-MRxU
  Update

  via
web flasher (USB-C) or OTA if available.

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????️ Setup Instructions

1. Flash your SLZB-MR1U with SLZB-OS v3.0.0

2. Plug the ZWA-2 USB stick directlydongle into the USB-A port of the MR1U

3. Open Z-Wave JS UI on your host system

4. Configure the serial port as:port:

5. Save settings and restart Z-Wave JS UI

6. YouPair should now be able to include/pairyour Z-Wave devices as normalusual

???? Example configuration screenshot:

(Insert image here of Z-Wave JS UI settings and USB stick connected to MR1U)

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????⚠️ Notes and Best Practices

• USB passthrough works best with powered USB hubs if you plan to add multiple USB devices (coming soon in future firmware).

• Only one USB device is supported at thea moment.time (multi-USB support is in development)

• EnsureMake sure port 8638 is accessible on your network firewall allows access to port 8638.

• Avoid usingrunning USB passthrough andwhile flashing EFR32 at the same time(Thread) — even though the issue is resolved, it's besta good practice to dokeep thesethose separately.tasks separate

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❓ Troubleshooting