Your in the right area and thanks for posting.
Now, usb rs232 is fun. Just about EVERYTHING talks that. mac, linux, linux subsystem for windows, bsd, cygwin, etc. has Minicom.
Every os for the past 35 years has kermit and its highly scriptable for serial connections.
Modern windows, as pointed has putty/kitty/mputty and a host of others even hyperterm is still out there to download and use.
Point being serial comms is so dead simple one can use any thing. As long as one knows what to type they’ll get a standard in and a standard out from what ever terminal program your using.
Now for a security point; telnet is plaintext going over your network which passwords can be sniffed by just about anything, Avoid telnet in mission critical production if possible. The HP 2530 does support ssh:
https://techhub.hpe.com/eginfolib/networking/docs/switches/RA/15-18/5998-8151_ra_2620_asg/content/ch08s06.html
Telnet is fun for toys like bbses, cli games, etc… but nothing that involves anything that must be secured going over a wire.
Personally my favorite is either uucp or kermit. But mputty is great for windows boxes that I can’t get a unix environment setup on.
I love uucp and kermit because they are very universal and don’t care about the transport layer. If I wanted to dial up a remote system over mqtt there’s a way to do that, serial; damn straight, telnet ok, ssh yeah got that, http can be done. Doesn’t matter.
Putty one is just stuck with what is programmed into it.
Plus its kind of cool using a text to speech processor, a terminal, alias for cu(1) as call
and Texpander to tell a computer:
call unixlabs
or
call wopr
Then have it actually make a connection to bell labs or nasa via different tools.
unix nerdy stuff
The wopr one just has cu calls plumb start web https://www.nasa.gov/multimedia/imagegallery/index.html
while unixlabs does a ftp sync with belllabs via curl.