Review on 🌐 StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black by Jackie Shallenberger

You'd better learn to figure things out for yourself. The documents are minimally helpful. With my telescope I could never get it to work with the device in TCP mode. Fleeting semi-functional performance with messed up messages and lots of communication errors reported by the device. I switched to UDP and it worked great with my telescope mount right away. I used static IP addresses for everything.