machine with serial bus to ip ethnert

Hello,

I have a machine ( a modem) that send information loops that indicates whether the machine on, if walking is an error , if the machine stops etc ..
I would like to get his information, which is sent in serial links , to send them via IP over a web interface.
Can you guide me , advise me to a path ?
Thank you,

You might start with an arduino with an ethernet shield.

Yeah, I have the shield ethernet, , but after, I d'ont knows how I can receive the information in serial 485