Feature Request: Add support for Serial-over-USB UPS models (MUST EP21-0612 PRO / blazer_usb) in TOS 7
Posted: 11 Jun 2026, 01:21
Hi TerraMaster Team,I would like to request expanded UPS support in the upcoming TOS 7.Currently, TOS primarily supports standard USB-HID Power Devices. However, many popular, heavy-duty UPS models, such as the MUST EP21-0612 PRO and similar series, do not use the USB-HID protocol. Instead, they utilize a Serial-to-USB chip and communicate via older but highly reliable protocols (like Megatec / Q1).These specific UPS models are extremely popular among NAS users because they support large, high-capacity external batteries of various types (AGM, Gel, LiFePO4, etc.). This allows users to build long-running backup power setups for their server hardware. Unfortunately, due to their industrial-leaning design, they completely lack USB-HID chips.In standard Linux Network UPS Tools (NUT), these devices are fully supported and successfully handled by drivers like:blazer_usbnut-xml (or custom serial-over-usb drivers)Since TOS is based on Linux, it would be a huge upgrade if you could include these native NUT drivers (blazer_usb / nut-hex / richcomm_usb) in the TOS 7 UPS management service. This would allow users to manually select the appropriate driver if standard USB-HID auto-detection fails.Device details for reference:Model: MUST EP21-0612 PRO (and similar series with external battery support)Connection: USB (recognized as a serial/COM emulation device, not HID)Common Linux NUT driver: blazer_usb (subdriver cyan)Adding this would greatly expand compatibility for advanced users who rely on custom, long-lasting power backup solutions.Thank you for your hard work on TOS 7!