LAARS’ ProtoNode Startup GuidePage 24 of 435 BACNET MS/TP AND BACNET/IP: SETTING NODE_OFFSET TO ASSIGNSPECIFIC DEVICE INSTANCES• After setting your PC to be on the same subnet as the ProtoNode (Section 4.1), open a webbrowser on your PC and enter the IP address of the ProtoNode; the default address is192.168.1.24.• The Web Configurator will be displayed as your landing page. (Figure 19)• Node_Offset field will be presented displaying the current value (default = 50,000).• Change the value of Node_Offset to establish the desired Device Instance values, and clickSUBMIT.o Given that: Device Instance = Node_Offset + A Bank Settingo Then: Node_Offset (required) = Device Instance (desired) – A Bank SettingFor example:o Device 1 has a Modbus Node-ID of 1o Device 2 has a Modbus Node-ID of 2o Device 3 has a Modbus Node-ID of 3o “A” Bank DIP switches setting = 11o Desired Device Instance for 1 st device = 1,011o Node_Offset (required) = 1,011 – (A Bank Setting) = 1,011 – 11 = 1,000o The Node_Offset value will be applied to all devices.o Device 1 Instance will then be = 1,000 + A Bank Setting = 1,000 + 11 = 1,011o Device 2 Instance will then be = Previous Value + 1 = 1,011 + 1 = 1,012Device 3 Instance will then be = Previous Value + 1 = 1,012 + 1 = 1,013Figure 19: Web Configurator screenLAARS Heating SystemsPage 24 of 4320 Industrial Way, Rochester, NH, USA 03867 • (800) 900-9276 • www.Laars.com
