ProtoNode Gateway
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2.5 BMS Network Settings: MAC Address, Device Instance and Baud Rate
2.5.1 BACnet MS/TP (RER): Setting the MAC Address for BMS Network
Only 1 MAC address is set for the ProtoNode regardless of how many devices are connected.
Set the BACnet MS/TP MAC addresses of the ProtoNode to a value between 1 to 127 (MAC Master
Addresses); this is so that the BMS Front End can find the ProtoNode via BACnet auto discovery.
Note: Never set a BACnet MS/TP MAC Address from 128 to 255. Addresses from 128 to 255 are
Slave Addresses and can not be discovered by BMS Front Ends that support auto discovery of BAC-
net MS/TP devices.
Set “A” bank DIP switches A0 - A7 to assign a MAC Address to the ProtoNode for BACnet MS/TP.
Please refer to Appendix C for the complete range of MAC Addresses and DIP switch settings.
NOTE: When using Metasys N2 and Modbus TCP/IP, the A Bank of DIP switches are disabled
and not used. They should be set to OFF.
FIGURE 7 - MAC Address DIP Switches
NOTE: When setting DIP Switches, please ensure that power to the board is OFF.
2.5.2 BACnet (RER): Calculating the Default Device Instance
The Device Instance value is automatically generated using the following formula:
BACnet Device Instance = (Device Node ID) + (Default Node Offset)
NOTE: The default Node Offset is 50,000.
For example, if Device A has a Node ID of 1 and Device B has a Node ID of 2, then:
BACnet Device Instance A = (1) + (50000) = 50001
BACnet Device Instance B = (2) + (50000) = 50002
NOTE: The Node ID is set in Section 2.3.2.
To reach a specific BACnet Device Instance result, refer to Section 5.
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