A flexible link system and approach for dynamically switching among wall modules of various types without re-engineering an associated controller application. Some of the types of wall modules may incorporate those of Sylk, BACnet and conventional types. A wall module type switching mechanism may incorporate a controller incorporating an application having a flexible link for the connection of wall modules of various types. The flexible link may enable a number of data points of the application to be applicable to various types of wall modules in that switching from a wall module of one type to a wall module of another type does not necessarily require another set of data points in the application.