My brother has presented me this animal – MOXA NPort 5150.
This device allows to connect legacy RS-232 devices to the world of TCP/IP. We used such things years ago developing software for POSes and ATMs. Just change a dialing script from something like
ATD192.168.1.1 and off you go.
Have no idea what to do with this now. I even have no proper RS-232 port, only via a USB cable. Interestingly, back those days such devices were very expensive.