How to connect DS9097U-009 adapter to IRZ RUH2B router?

Question

linux

The idea is as follows: there is a router with an RS232 port and, accordingly, an original 1-Ware adapter, it is necessary to create a data link of devices for temperature monitoring through an 18B20 sensor. The router runs Linux, but all changes are made accordingly through the firmware. Supports sh scripts, through which I would like to receive data from sensors on the home server and the narodmon service. Can anyone tell me step by step what I should do? I am practically not strong in Linux, I worked a little with OpenWRT.