A building automation system (BAS) network manager supporting a plurality of device protocols coupled to at least one communication network, and a plurality of logical connections to individual BAS networks to multiple end devices of a BAS. The BAS network manager can communicate with each of the end devices regardless of the protocol or protocol version of the BAS network by implementing a protocol stack above the link layer for each protocol or protocol version, providing an integrated multi-BAS network interface, and maintaining a device identifier for each BAS network the network manager is coupled to in the protocol stack.