GW-2139M is a network gateway which allows Modbus TCP client devices to function as a BACnet MS/TP master and being able to access BACnet MS/TP network . The BACnet Master Slave Token Passing (MS/TP) protocol is used to relay and exchange information between building devices. GW-2139M contains a large number of BACnet objects (AI, AO, AV, BI, BO, BV, MSI, MSO, MSV) that provides flexibility in mapping Modbus TCP registers to any combination of BACnet objects. In addition, BACnet interoperability building blocks (DS-RP-A, DS-RPM-A, DS-WP-A, DS-WPM-A, DM-DDB-A, DM-DOB-A, DM-DCC-A, DM-RD-A) are supported as well. All the data transfer is configurable by using ICPDAS Utility.