Hello,
Depending of the needed Bandwith a X20CS1030 may be an option behind a BC0083 in the field. If the question is about cabeling, and cable lenght.
I am also not very familiar with RS485 but normaly it means, you have to read the Documentation and implement some kind of drive Task (Serial Communication). As there are no Standards around.
Please consider limited Bandwith due to X2X-Bus Communication
EDIT: If you name your 3rd Party device you can try to finde some here already used it.
Greetings
Michael