This worked like a charm, I had the same issue, followed these steps and worked perfectly right after a the restart:
https://support.microsoft.com/en-us/windows/device-protection-in-windows-security-afa11526-de57-b1c5-599f-3a4c6a61c5e2

@Alfred-Stoppels in your case you should use type B, base on your picture.

However, adapters are not standard, except the thread. Thus these restrictors may not function well. In this case try this one:
Restrictor for AI transmitter

This is my classic chat support dialog, this one is from today, but essentially they are exactly the same.

e11ef965-3555-4e29-ab60-44e8b74438e6-image.png

And they even don’t know where my D5 is now.

e4ac156b-c047-4058-924f-b4c197ed5593-image.png

And after that they told it is in the one of the finnish service, (it is listed on suunto service locator site) I called there - they told they haven’t received anything by mail.

My guess they lost it somewhere.

@Mikael said in Suunto Solution (1992 year dive computer):

Hello Community
I have an working Suunto Solution and also the data interface for it, but this uses RS232 not supported by any PC today.
Are there any modern interface to transfer data from it?
Have anyone built one, e.g. by Arduino?
Are any interface specs available/public to support a modern build?
Mikael

I know there are RS232-USB adapters, it could be what you’re looking for.

@Jérôme85 You might want to read this thread: https://forum.suunto.com/topic/10284/suunto-watches-to-come-in-2024/69

There are some hints or information sources in there 🙂

@jez01 Suunto app doesn’t support Vyper Novo, use SuuntoLink:
https://www.suunto.com/en-gb/Support/faq-articles/suunto-app/how-do-i-sync-dive-logs-from-my-dive-computer-to-the-suunto-app/