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<div>Thanks Ken.<br>
I'll plan to sit down and look up the protocol information over the next week or so and follow up.
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ken Olum <kdo@cosmos.phy.tufts.edu><br>
<b>Sent:</b> Tuesday, January 14, 2020 1:35:10 PM<br>
<b>To:</b> David Zomaya<br>
<b>Cc:</b> kdo@cosmos.phy.tufts.edu; layne.fowler@gmail.com; nut-upsuser@alioth-lists.debian.net<br>
<b>Subject:</b> [EXTERNAL] Re: [Nut-upsuser] Tripp Lite SMART1500LCD will not stay shut down when power is disconnected</font>
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______________________________________________________________________<br>
Hi, David. Thanks for the offer of help. I have BCPERS450 serial<br>
number 2701DVHBC809300177. Unfortunately I'm about to go on a trip and<br>
will be away until the end of the month, so I don't have much time to<br>
discuss these things at the moment, but maybe Layne will have something<br>
to say.<br>
<br>
My understanding from when I was working on this a couple years ago is<br>
that the main problem in getting NUT working right with Tripp-Lite<br>
equipment is to understand the mappings of the various controls. For<br>
example, we have ReportID: 0x15, which maps to<br>
UPS.OutletSystem.Outlet.DelayBeforeShutdown. I think this mapping is<br>
given by the UPS. NUT than maps this control to load.off.delay. Is<br>
that mapping correct, i.e., does setting the control in the UPS do the<br>
function that NUT expects?<br>
<br>
More importantly, is there anything in the UPS that NUT should be<br>
mapping to load.on.delay? It does not find such an object, so<br>
load.on.delay is not mapped, which was the original source of the<br>
problem.<br>
<br>
Incidentally, according to my old notes, when I ask my UPS to shut<br>
down in ten seconds by setting UPS.OutletSystem.Outlet.DelayBeforeShutdown,<br>
it shuts down even if the power comes back on during those ten seconds.<br>
This is the right behavior because once I send the command I shut down<br>
my system and it needs the power cycle to restart. My understanding is<br>
that Layne's system does not do this, so there is some difference in<br>
configuration or between the different models.<br>
<br>
The only corner case affecting my system that I am aware of is this:<br>
suppose the line power comes back at the same time that my system has<br>
decided to shut down. The UPS tries to notify the system that the power<br>
is back on, but it's too late and the system is already in the process of<br>
sending the UPS.OutletSystem.Outlet.DelayBeforeShutdown. Having done<br>
so, the system thinks the UPS will shut off and so shuts down. However,<br>
because the power was on by the time that UPS actually received the<br>
command, it does not in fact shut off. Thus the system is shut down and<br>
never reboots. I don't know how this case is supposed to be handled.<br>
<br>
Thanks again.<br>
<br>
Ken<br>
<br>
<br>
<br>
<br>
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