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2: Using the ProtoCom/ProtoCom-Lon
2.4: Step Four - Set MAC Address/Device Instance/Node-ID (Proto-
Com only)/IP Address
The Building Management System (BMS) in use must be able to distinguish the Proto-
Com, and the meters attached to it, from all of the other devices in the BMS system.
For this reason, the ProtoCom and connected devices must be given a unique ID. The
specific ID you need to set depends on the BMS protocol you’ll be using.
• MAC Address - used for BACnet MS/TP protocol only (Section 2.4.1): this is an
eight bit address used to identify devices on a single RS485 subnet (the devices
attached to the ProtoCom when using BACnet MS/TP). It identifies the ProtoCom to
the BACnet MS/TP protocol.
• Device Instance - used for both BACnet MS/TP and BACnet/IP (Section 2.4.2): the
Device Instance is used to set up a unique identifier for each of the meters
attached to the ProtoCom.
• Node-ID - used for Metasys N2, Modbus/TCP, and DF1 (Section 2.4.3): this is the
unique identifier for each of the meters attached to the ProtoCom.
2.4.1: Set MAC Address - for BACnet MS/TP Protocol Only
• Note that only 1 MAC address is set for the ProtoCom, regardless of how many
devices are connected to it.
• Set the BACnet MS/TP MAC address between 1 and 127 (Master MAC address):
this is so that the BMS system can find the ProtoCom via BACnet auto discovery.
• Use DIP switches A0 - A7 to assign the MAC Address for BACnet MS/TP.
Figure 2.2: A Bank of DIP Switches