BACnet is a communication protocol designed for Building Automation and Control (Networks), for
use with a Building Automation System (BAS) which controls and automates certain functions
within a building. A BAS typically receives data from multiple remote devices, such as temperature,
electrical consumption, air quality, and many other types of data depending on what is or can be
automated in the building. Based on this data, the BAS can send alerts to building managers and
control loads, such as turning on heating if an area becomes too cold or turning off non-critical
systems to load shed when overall consumption becomes too high.
The eGauge can provide BACnet data over an Ethernet LAN (BACnet IP) as well as over RS485
serial (BACnet MS/TP). Any data the eGauge collects, including from other remote devices, are
available to send
A building automation system (BAS) will periodically request data from a remote device (e.g., the
eGauge meter), and based on this data it may do nothing, trigger an alarm, or switch on or off
loads or other controllable equipment.
BACnet is disabled by default on the eGauge meter and may be enabled through Settings →
BACnet. For an example of the configuration and options available see this knowledgebase article.
BACnet Overview
Quick Links:
• BACnet register map and PICS
• Configuring BACnet service
What is BACnet?
eGauge compatibility
General overview
Using the eGauge USB485, the eGauge meter can provide data via BACnet to a building
automation system.
BACnet MS/TP (Serial)
Be sure to review general (non-eGauge specific) serial communication considerations when
considering serial lines for BACnet communication. This includes but not limited to:3CmxGraphModel%3E%3Croot%3E%3CmxCell%20id%3D%220%22%2F%3E%3CmxCell%20id%3D%221%22%20parent%3D%220%22%2F%3E%3CmxCell%20id%3D%222%22%20value%3D%22%26lt%3Bfont%20color%3D%26quot%3B%23ff3333%26quot%3B%26gt%3BData%20from%20eGauge%20Meter%20electrical%20readings%20are%20sent%20to%20Building%20Automation%20System%26lt%3B%2Ffont%26gt%3B%22%20style%3D%22text%3Bhtml%3D1%3BstrokeColor%3Dnone%3BfillColor%3Dnone%3Balign%3Dcenter%3BverticalAlign%3Dmiddle%3BwhiteSpace%3Dwrap%3Brounded%3D0%3BfontSize%3D15%3B%22%20vertex%3D%221%22%20parent%3D%221%22%3E%3CmxGeometry%20x%3D%22530.23%22%20y%3D%22580%22%20width%3D%22150%22%20height%3D%2280%22%20as%3D%22geometry%22%2F%3E%3C%2FmxCell%3E%3C%2Froot%3E%3C%2FmxGraphModel%3Eaaaaaadasdas
•Using twisted pair wire for data +/- lines
•Choosing appropriate wire gauge and baud rate (becomes increasingly important with long
wire runs)
•Appropriate termination methods (the eGauge USB485 has a selectable termination switch)
•Software and hardware configuration for BAS system controller
BACnet IP (over an Ethernet network)
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