Here are the changes and improvements we made to the ZEN20 model so far.

VER. 1.0 (released 7/2017)

Original release.
Hardware:

• No mounting screw holes, straight plug

Firmware: 20.15

• No advanced settings, no power monitoring, no status recovery after power failure (defaults to off)

VER. 2.0 (released 11/2018)

Hardware:

• Added mounting screw holes
• Added angled plug
• Reduced cord length to 2 feet
• Added power monitoring (W and kWh only)
• Added on/off USB reports to the hub

Firmware: 1.0

• Added S2 security
• Added OTA firmware updates
• Added on/off status recovery after power failure
• Added built-in turn-on and turn-off timer for each outlet
• Added advanced settings for LED Indicators, manual control, power monitoring, and behavior after power outage

VER. 2.01 (released 12/2018)

Firmware: 2.0

• Added a workaround for multi-channel inclusion for SmartThings

VER. 2.02 (released as OTA file 8/2019)

Firmware: 2.02

• Reduced USB port on/off and power monitor reporting frequency to 30 seconds minimum
• Added the option to disable power reports for individual outlets and disable on/off reports from USB ports

VER. 2.03

Hardware:

• Added A and V reports to the power meter (older versions can't be upgraded to 2.03 due to this hardware difference)

Firmware: 2.03

• Added parameter settings for A and V reporting frequency (disabled by default, see parameters 35 and 36 here)

VER. 3.0

Hardware:

• Enhanced protection against high inrush current from low-quality power adapters

Firmware: 3.0

• Based on the 2.03 firmware from version 2.0 hardware

VER. 800LR (released 07/2024)

Hardware: 4

• 800 Series Z-Wave chip

Firmware: 4.10

• Based on 3.0 firmware (see above)
• Long Range ready
• Added Advanced Parameter 37: Electrical Current (A) reporting threshold. See all settings here.
• Added Notification Command Class. The Power Strip will now report "Over-current detected" when parameter 5 "overload protection" is triggered.

Firmware: 4.20 (released 09/2024)

• Fixed a bug: Reports from the Meter Command Class might be affected on the selected platform
• Fixed a bug: Parameter 37 - the software was reporting incorrect units for the Current Threshold
• The current and power acquisition algorithm has been optimized to reduce the intermediate reporting data
• Improved meter reporting when a value changed from non-zero (last reported value) to zero (current value)

 

If your ZEN20 is VER. 2.0 or higher, you can update it via OTA firmware updates to version 2.02, here is how to do that. You can access all firmware files here once you register your product and create an account here. Questions? Just reach out to our support!