VC1000 Focus Guide - ProLon

VAV Controller
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2.2 Network Menu
2.2.1 Math Functions (for BACnet or LON networks only)
Figure 2.2.1: Math function configuration screen
This screen is used to configure the math functions of a VAV Controller when it is in a
BACnet or LON network ONLY. If you want to change the math functions available in a
Modbus network, this can only be done on the master controller of the system.
Besides calculating its own demand, a VAV Controller can detect and analyze the
demand and group codes of other VAV Controllers on a BACnet or LON network, as long
as they are on the same subnet (127 device maximum). The information is then used to
calculate the math functions specified on this screen. The resulting math values can then
be used to control the outputs of the VAV Controller and are also accessible to the rest of
the network in NVO form.
• Enable Math: To avoid creating unnecessary network traffic, the VAV Controller’s math
functions are disabled by default. Two methods can be used to activate the math
functions. The first is to set an output’s control source to a math function, and the
second is to activate them manually using this option.
• Source: Each math function can be calculated in one of the following ways:
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