ZigBee Wireless Data Links  
Base Data Connections RS422 (Z-2400-RB Only)  

The base is wired onto an existing data loop using terminals 70,71,72,73, that connect to existing terminals on a RS422 data loop. Use terminal 74 as a ground connection.

Additional reminder notes

The master of the data loop  (in this case shown as 2400-IS) can be one of the following:
2100-IS, 2100-NS, 2400-IS, but NOT 2100-NET.