The Network UPS Tools repository. UPS management protocol Informational RFC 9271 published by IETF at https://www.rfc-editor.org/info/rfc9271 Please star NUT on GitHub, this helps with sponsorships!
exact device name and related information (manufacturing date, web pointers, ...), Tripp Lite AVRX550U
complete problem description:
When the UPS loses AC power and receives a shutdown command from the server after the server shuts down the UPS powers down but then after two seconds powers back on even though it is still under battery power. When I contacted Tripp Lite about the issue, they pointed out that the AVRX550U uses the 2012 protocol, but the NUT compatibility list has it using the 2010 protocol. If Tripp Lite is correct then the protocol in AVRX550U needs to be corrected to 2012, not 2010.
Second, it's unclear if NUT is issuing the command for the UPS to power back on after powering off, but it should not be issuing that command. I've attached the protocol documentation that Tripp Lite sent me. You probably already have it, but just in case it's helpful, here it is.
Second, it's unclear if NUT is issuing the command for the UPS to power back on after powering off, but it should not be issuing that command. I've attached the protocol documentation that Tripp Lite sent me. You probably already have it, but just in case it's helpful, here it is.
Communication Protocol 2012 for customer.pdf
Here is the upsmon.conf file:
ups.conf
upssched.conf