Comfortable　temperature　is　an　important　requirement　of　building　control.　In　order　to　optimize　the　intelligent　building　system,　efficiently　adjust　and　control　the　HVAC　system,　bring　users　more　comfortable　living　space,　and　optimize　the　HVAC　terminal　equipment,　it　is　necessary　to　communicate　with　the　controller　to　obtain　real-time　data.　However,　the　traditional　way　of　using　the　controller　is　mostly　adjusted　on　the　human-machine　interface　(HMI),　which　cannot　be　tested　uniformly　for　different　controllers.　At　present,　different　controllers　have　different　register　addresses　and　the　program　is　limited　to　obtaining　the　data　of　a　specific　controller.　Different　controllers　cannot　share　a　set　of　programs.　In　addition,　modbus　has　a　variety　of　communication　modes.　If　the　communication　mode　changes,　the　code　needs　to　be　changed　and　redeveloped.　Most　of　the　programming　cannot　make　modbus　universal.　In　order　to　solve　the　above　problems,　this　paper　focuses　on　several　ways　of　communication　and　connection　between　LabVIEW　and　Modbus.　It　mainly　proposes　a　configurable　Modbus　communication　mechanism　based　on　LabVIEW,　the　Modbus　protocol　is　made　universal.　The　program　obtains　the　configuration　parameters　of　different　Modbus　communication　modes　and　the　parts　of　different　controllers　through　the　configuration　file,　so　as　to　realize　the　code　scalability　and　compatibility.　Therefore,　the　controller　supporting　Modbus　protocol　can　communicate　in　real　time　as　long　as　the　configuration　is　modified.　This　method　can　be　applied　to　the　industrial　controller　supporting　modbus　and　can　effectively　solve　the　problem　of　communication　barriers　between　the　configuration　software　LabVIEW　and　different　controllers.　©　2021　IEEE.