I am interested in creating a modbus network within our facility using either RS-422 or RS485. What type of hardware is available to make the drops off the network? Are there Tee connectors available (who is the manufacturer) or do most networks use a daisy chain type system?

 

Visit www.advantech.com.
They R in industrial auotmation products. They can fulfill UR requirements.

Regards
Ananth

 

You may want to consider using Fibre and check out www.westermo.se look for their Fiber Modems model LD64.
Regards

 

lot of products @
http://www.modicon.com/opennetworking/modbus/partnumbers.htm