Hello The page https://networkupstools.org/ddl/Liebert/PSA_1500.html don't contain all information about UPS series PSA. First, the variable "*device.serial*" is dummy, it is always empty , and "*ups.serial*" also always empty. Second, configuration file for the all UPS "PSA" contain these lines: [PSA] ??? driver = "usbhid-ups" ?? ?port = "auto" ?? ?vendorid = "10AF" ?? ?productid = "0001" ?? ?product = "LiebertPSA" This is my /etc/nut/ups.conf for the Vertiv (ex Liebert) PSA500MT3-230U -- ????????? ?????? ?????? "??? ?????" ??? ????????: - email:stas.grumbler at gmail.com ?stas at vashadmin.su - ???????? ? ?-????? +79222112259 (+telegram), +79505571146, +79193628944 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://alioth-lists.debian.net/pipermail/nut-upsdev/attachments/20230719/8f15f085/attachment.htm>