Nowadays, for just graceful shutdown, to protect old models without a central UPS in the room etc., a little compact UPS literally cost in the hundreds. It just needs to keep alive the machine just to issue a PWRDWNSYS.Even without direct cables, most UPS have a network interface that can be queried for the grid status via simple SNMP.A DIY solution would be to poll the SNMP every x seconds from the partition, and issue whatever command is required in case of grid fault. Do put the net switch under UPS too ;) or if you have a spare net interface I guess one can connect directly avoiding any other serials means.Regarding pure serial cable, last one I recall in the past on old system was something out of
https://www.apc.com/us/en/faqs/FA159551/
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UPS Signalling Bundle for IBM AS/400 & ...
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On Tuesday, August 5, 2025 at 09:22:13 AM GMT+2, Patrik Schindler <poc@xxxxxxxxxx> wrote:
Hello James,
Am 04.08.2025 um 22:29 schrieb James H. H. Lampert via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx>:
Until the second power outage hit.
Ouch.
I second Thomas Burrows' thought. UPSes aren't really expensive nowadays. And if someone wants to avoid investing cost for old systems, get used ones and NoName replacement battery packs from eBay and reassemble yourself.
Bigger companies here often have very large UPS, protecting the complete local server room.
For years, I have on my ToDo-List to derive the pinout of classic AS/400 UPS port from publicly available adapter pinouts. If anyone has a pointer to a readymade pinout, I'm all ears!
:wq! PoC
midrange.com
