[Nut-upsuser] [EXTERNAL] Re: Tripp Lite SMART1500LCD will not stay shut down when power is disconnected

David Zomaya David_Zomaya at tripplite.com
Wed Jan 15 00:48:20 GMT 2020

Thanks Ken.
I'll plan to sit down and look up the protocol information over the next week or so and follow up.
From: Ken Olum <kdo at cosmos.phy.tufts.edu>
Sent: Tuesday, January 14, 2020 1:35:10 PM
To: David Zomaya
Cc: kdo at cosmos.phy.tufts.edu; layne.fowler at gmail.com; nut-upsuser at alioth-lists.debian.net
Subject: [EXTERNAL] Re: [Nut-upsuser] Tripp Lite SMART1500LCD will not stay shut down when power is disconnected

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Hi, David.  Thanks for the offer of help.  I have BCPERS450 serial
number 2701DVHBC809300177.  Unfortunately I'm about to go on a trip and
will be away until the end of the month, so I don't have much time to
discuss these things at the moment, but maybe Layne will have something
to say.

My understanding from when I was working on this a couple years ago is
that the main problem in getting NUT working right with Tripp-Lite
equipment is to understand the mappings of the various controls.  For
example, we have ReportID: 0x15, which maps to
UPS.OutletSystem.Outlet.DelayBeforeShutdown.  I think this mapping is
given by the UPS.  NUT than maps this control to load.off.delay.  Is
that mapping correct, i.e., does setting the control in the UPS do the
function that NUT expects?

More importantly, is there anything in the UPS that NUT should be
mapping to load.on.delay?  It does not find such an object, so
load.on.delay is not mapped, which was the original source of the

Incidentally, according to my old notes, when I ask my UPS to shut
down in ten seconds by setting UPS.OutletSystem.Outlet.DelayBeforeShutdown,
it shuts down even if the power comes back on during those ten seconds.
This is the right behavior because once I send the command I shut down
my system and it needs the power cycle to restart.  My understanding is
that Layne's system does not do this, so there is some difference in
configuration or between the different models.

The only corner case affecting my system that I am aware of is this:
suppose the line power comes back at the same time that my system has
decided to shut down.  The UPS tries to notify the system that the power
is back on, but it's too late and the system is already in the process of
sending the UPS.OutletSystem.Outlet.DelayBeforeShutdown.  Having done
so, the system thinks the UPS will shut off and so shuts down.  However,
because the power was on by the time that UPS actually received the
command, it does not in fact shut off.  Thus the system is shut down and
never reboots.  I don't know how this case is supposed to be handled.

Thanks again.


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