AERCO ProtoNode FPC-N34 & FPC-N35 User Manual
CHAPTER 5 – BACnet MS/TP and BACnet/IP: Setting Node_Offset To Assign Specific Device
Instances
OMM-0107_0B
AERCO International, Inc.
•
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•
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03/07/2017
CHAPTER 5.
BACnet MS/TP and BACnet/IP: Setting
Node_Offset to Assign Specific Device Instances
•
After setting your PC to be on the same subnet as the ProtoNode (Section 4.1 ), open
a web browser on your 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, you
will need to get the assigned IP Address from the network administrator.
•
The Web Configurator will be displayed as your landing page (see Figure 5-1, below).
•
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
click the
Submit
button.
o
Given that: Node_ Modbus Node_ID = Device Instance
o
Then:
Node_Offset (required) = Device Instance (desired) – Modbus
Node_ID
For example:
o
Device 1 has a Modbus Node-ID of 1
o
Device 2 has a Modbus Node-ID of 2
o
Device 3 has a Modbus Node-ID of 3
o
Desired Device Instance for 1
st
device = 1,001
o
Node_Offset (required) = 1,001 – (Modbus Node_ID) = 1,001 – 1 = 1,000
o
The Node_Offset value will be applied to all devices.
o
Device 1 Instance will then be = 1,000 + Modbus Node_ID = 1,000 + 1 = 1,001
o
Device 2 Instance will then be = 1,000 + Modbus Node_ID = 1,000 + 2 = 1,002
o
Device 3 Instance will then be = 1,000 + Modbus Node_ID = 1,000 + 3 = 1,003