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- BACnet is a standard data communication protocol for building automation and control systems. MS/TP is most widely used LAN protocol for data communication among field devices in the BACnet-based building automation. In this study, the performance of MS/TP protocol is investigated using a simulation model. This study evaluates the delay characteristics of MS/TP being used to deliver a BACnet application service. Analysis of the simulation results was used to identify the network parameters that influence the performance of BACnet application service and to develop recommendatioins that should be considered when designing and operating BACnet systems.