GETTING STARTED XI581/2 BUSWIDE OPERATOR INTERFACE
EN2B-0126 (74-3554-8) 6
C-Bus
XI581AH/
XI582AH
Local
Excel
Controller
Remote Excel
Controller
Buswide
Access
Fig. 7. Buswide access.
Connection capabilities depend on the version of the controller and whether it has
buswide access mode software. Table 2 specifies the versions capable of buswide
access.
There are two buswide access modes (active and passive) for controllers that have
this capability.
• With active buswide access, a controller (for example, Controller A) can access
another controller (Controller B) on the same bus if Controller B has at least
passive access.
-Bus
XI581AH/
XI582AH
Controller A
active buswide
access
Controller B
active or passive
buswide access
Buswide
Access
Fig. 8. Active buswide access.
• With only passive buswide access, a controller (for example, Controller B) can-
not access another controller (Controller A) on the same bus. However, since
Controller B has at least passive buswide access, Controller B can be accessed
by another controller that has active mode (in this case, Controller A).
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