Hi,
I just spent a lot of last week trying to access the console of an old datacenter switch. I made a cable from the pinout of a similar switch.
My switch is a Dell S3048-ON this was for a C9010, it turned out to be correct.
So I tried over and over to make it work, but kept getting this garbled mess, but the mess was consistent with the rythm of a booting switch, and it kind of always looked the same
With many of these, I have many spares I thought they were broken, but they were not
I checked the signals with oscilloscope they were, dirty
So I made the signals cleaner by tidying it up
But still, it is a mess of garbled text !
Here I am using the other kind of serial adapter, this one serial to ethernet
Here is two runs, still garbled
As a last ditch attempt, I remembered one my old server has a real serial port !!
And it worked !
message continued in comment
I reached the limit in the post body so I can continuing it here
[I am no longer able to post pictures , imagine here the text, it is no longer garbled]
So the "real" serial port worked, but not my adapters !
So my question is this
What doesn't the serial output work with these adapters ?
I imagine it is because the TTL voltage levels versus the serial voltages levels.
How do I do level shiting, preferably passively so that my adapters work ?
Especially my serial to ethernet adapter, which I don't know any economical alternatives for.
These are WCH CH9121 by the way !