Based on this product's specifications, here are some alternatives and similar models
Serial Device Server Exsys EX-61008 — 8x RS232/422/485 ports, includes power adapter
Summary description:
Exsys EX-61008 is a serial device server providing eight configurable serial ports supporting RS232, RS422 and RS485 standards. Supplied with a power adapter, it enables network access and remote management of serial equipment such as industrial controllers, sensors and legacy devices. Ideal for integrating serial devices into Ethernet networks for monitoring, data collection and control.