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OmahaGTP

Newbie

OCTO PWM - How can I enable a hardware shutdown signal longer than 1 second in alarm?

Donnerstag, 23. Juli 2026, 18:46

Tried searching but not quite finding the answer and maybe I'm searching/phrasing incorrectly.

I have an OCTO PWM controller setup, I have a coolant temp sensor wired to the OCTO, I have an alarm set to activate at X degrees C, and I can see the device go into alarm in both the AquaSuite software and the OCTO has a LED that flashes red to indicate alarm.

I have the alarm cable 53216 setup in-line with my power switch and I have the setting in AquaSuite configured for "Power switch, 1 second at alarm".

My problem is this - I want this to be a hardware shutdown. I do not want Windows to be sent a request to shutdown gracefully. In Windows Control Panel I have "press power button" configured to "do nothing".

If the OCTO is only sending a 1 second signal, this is not sufficient for a hard shutdown. What am I missing here? Just to confirm it is cabled correctly - I wired the alarm cable 53216 into my reset header and the OCTO does successfully restart my computer, but again, looking for an actual shutdown. My understanding is that a software shutdown can be further defined in "Playground" but again, I do not want this to be software based, and I do not want AquaSuite services to be running in the background.

I think all I want is to be able to send a signal longer than 1 second.

Appreciate any assistance and thanks for your help! :)

Shoggy

Sven - Admin

Freitag, 24. Juli 2026, 09:59

You have to use "permanently switch on alarm".

As soon as the system is switched off, this alarm state and action is also reset.

OmahaGTP

Newbie

Freitag, 24. Juli 2026, 15:12

Oh man, that makes sense, can't believe I didn't think of that. Will test later, but that sounds like it'll work as expected. Thank you

Speedy-VI

Senior Member

Freitag, 24. Juli 2026, 16:41

Op's post made me curious about this. I have an Octo with cable #53216 connected to my mobo power switch header. I set it up several years ago, tested it, and have not thought about it since then.

In Aquacomputer, when the language is set to English, there is no option called "permanently switch on alarm". I think Shoggy is referring to the 3rd option, which is "Activate in case of alarm". I think this mode causes the Octo Signal header output to short when an Alarm occurs, and to stay shorted until the alarm is cleared or power is removed. The mobo will perform a hard shutdown, but not until the Octo Signal header has been shorted for more than 4 seconds, so it's not really an instant shutdown. Also, telling Windows to do nothing when the power button is pressed will prevent a graceful shutdown when the case power button is pressed for less than 4 seconds. I think it would be better to leave it set to "Shutdown" so you can still use the case power button to initiate a graceful shutdown. Pressing the case power button for more than 4 seconds will always cause a hard shutdown because this happens at the hardware level and is not dependent on Windows.

OmahaGTP

Newbie

Freitag, 24. Juli 2026, 17:57

That's kind of funny - I haven't test yet, but that different translation is 100% what threw me off, the "Activate in case of alarm" seemed really vague. Possibly worth updating the English in a future release?

And I agree with you about letting the computer do a graceful shutdown - I was just testing and wanted to be 100% confident it was a hardware shutdown and not a software shutdown, but agree that it is best to leave the power button initiating a shutdown enabled.

EDIT: Tested, worked first try, works great. Problem solved. Thanks again to you both.

Dieser Beitrag wurde bereits 1 mal editiert, zuletzt von »OmahaGTP« (25. Juli 2026, 16:35)

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