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From: HW <none@no.no>
Newsgroups: sci.electronics.repair
Subject: Re: Waking up a serial port
Date: Mon, 17 Mar 2025 15:19:08 +0100
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On Sat, 15 Mar 2025 17:30:03 -0000 (UTC), bp@www.zefox.net wrote:

>Are there any customary tricks to making a diagnostic serial port
>active?

I am not aware of any standards.

Some devices will respond to a few CR-LF, as in pressing the enter key
a few times, but those are probably mostly intended to be accessible
by the user.

A device like this may very well have the serial port disabled in
firmware.