When using the AST20 handheld tool or the ACS941 PC tool, all bus parameters and VAV controller parameters (VAV control parameters and actuator parameters) can be set.
Connect AST20 or ACS941 (using the AST22 interface converter) to the VAV controller and navigate to the bus configuration menu.
BACnet address and Max. Master setting
Set bus parameters as desired, at least the address. Check Device Object ID and Max. Master as well: If Max. Master is lower than the desired BACnet address, the node will be identified as a “slave-only” device.
Optionally make changes on VAV controller parameters in VAV configuration menu.
With AST20, all parameters can be set using the mass configuration function. The bus parameters are included in the mass programming routine. It can be selected that the address is automatically incremented with each programmed VAV controller. ACS941 supports saving and loading of parameter sets.
Figure 2: Bus configuration with AST20 (left) and with ACS941 (right)