ProtoNode Gateway
28 750-426
5. BACNET MS/TP AND BACNET/IP: SETTING NODE OFFSET TO ASSIGN SPECIFIC
DEVICE INSTANCES
After setting a local PC to the same subnet as the ProtoNode (Section 4.1), open a web browser on
the PC and enter the IP Address of the ProtoNode; the default address is 192.168.1.24.
• If the IP Address of the ProtoNode has been changed by previous configuration, the assigned IP Address
will need to be obtained from the network administrator.
• The Web Configurator will be displayed as the landing page.
Node_Offset field will be presented displaying the current value (default = 50,000). The values
allowed for a BACnet Device Instance can range from 1 to 4,194,303.
• To assign a specific Device Instance (or range); change the Node_Offset value as needed using the calcula-
tion below:
Device Instance (desired) = Node_Offset + Modbus Node_ID
For example, if the desired Device Instance for the device 1 is 50,001 and the following is true:
Device 1 has a Modbus Node-ID of 1
Device 2 has a Modbus Node-ID of 22
Device 3 has a Modbus Node-ID of 33
Then plug the device 1's information into the formula to find the desired Node_Offset:
50,001 = Node_Offset + 1
50,000 = Node_Offset
Once the Node_Offset value is input, it will be applied to all devices as shown below:
Device 1 Instance will then be = 1,000 + Node_ID = 1,000 + 1 = 1,001
Device 2 Instance will then be = 1,000 + Node_ID = 1,000 + 22 = 1,022
Device 3 Instance will then be = 1,000 + Node_ID = 1,000 + 33 = 1,033
Click “Submit” once the desired value is entered.
FIGURE 29 - Web Configurator Node Offset Field
FIGURE 30 - Active Profiles
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