What the fuck is this socket? I know what a normal RS232 socket looks like, and this isn't it. Are there any USB adapters for this shit?

That is the nutmeg variety RS232 socket. Version 2 in specific.

wire a TX RX GND to an Arduino or any serial communication device

thats all

>>105678971 (OP)
It's just a screw terminal connector so you can make an ad hoc cable out of junk wires.

I found something.

>>105679086
you're making this difficult for your self

why USB instead of direct wires ?

>>105679086
Make sure that your cable uses the right logic levels. Most of them use TTL levels while RS-232 uses higher voltages (and also negative voltages).

>>105678971 (OP)
RTFM, it's obviously for asynchronous comms, could be uart/sci breakout from rs232 with automation applications, you really need to know the logic level voltages to narrow it down, which would be in the fucking manual.

>>105679176
Manual says it's RS232.

Shove it up ur ass