Roberts Gorden 10081601NA Rev H 12/11 Manual Do Utilizador

®

36 of 62

5.5.1 Repeater
If the RS-485 communications wire length is above 4000' (1219 m), a repeater must be used to extend the 
signal. The repeater can also be used to install in different methods:

• To extend communications beyond the standard 4000' (1219 m) limitation. 

See Page 36, Figure 21.

• To add parallel branches of ROBERTS GORDON

®

 ULTRAVAC™ controller communications bus wiring.

See Page 37, Figure 22.

NOTE: The maximum number of ROBERTS GORDON

®

 ULTRAVAC™ Controllers that can be installed is 

242.

Repeater

URVRP