Configuring BACnet

4 Minute Read

| Introduction

75F has implemented a simple to setup BACnet Server functionality from the CCU. When you enable the BACnet server on the CCU it will begin broadcasting available BACnet points on the preferred network. The CCU will be the only BACnet device discovered by the BACnet client. All other mesh node (VAV, DAB, Smart Stat) points will be discovered as part of the CCU device. 

| Network Connectivity

The CCU can connect to the network via WiFi (preferred) or can also use a USB to Ethernet adapter to connect directly to the network switch via LAN. 

Whether you use Ethernet or WiFi for connecting to your network, you must set a static IP address for reliable communication between server and client. 

| Architecture 

Below is how the 75F architecture looks when BACnet is enabled. 

| BACnet Requirements 

Hardware Requirements:  

1. 75F® CCU 
2. 75F® CM Board 
3. USB to Ethernet Converter (optional)

| Supported 75F Profiles

Check out this article for what objects are exposed for each 75F profile connected to the CCU. 
https://support.75f.io/hc/en-us/articles/1500012829501-BACnet-Objects

| Wiring

If you are going to be using WiFi skip to Configuration

If you are planning on connecting your CCU via LAN. Connect to your network as follows. 

1. Connect one end of the Ethernet cable to USB-to-Ethernet adapter as shown below.  

Note: BACnet over Ethernet allowed building automation systems to transfer data via ethernet across a bus architecture. This worked well initially but with the advent of the internet and the desire to have a single control system across a network of buildings, the need for networks larger than 254 nodes was needed. 

     2. Connect the USB part of USB-to-Ethernet adapter to CM board USB port as shown below:  

     3. Connect the other end of Ethernet cable to Wi-Fi router (or) switch as shown below:  

      4. Confirm the Ethernet connection is active by checking the Ethernet icon on the top-right-side
         of notification bar.  

| Configuration 

1. Go to CCU Settings > Installer Operations screen for configuring BACnet. 
2. Click the Use BACnet toggle to see the. By default, it will be Auto Config. Based on the network type connected, prefix of the IP address will be updated.   
   For example: If Ethernet is connected, then it will display Ethernet-IP address as shown below:  

3. Select Manual Config option to update the static IP address.  

4. Click  INITIALISE  button to initialize the BACnet objects. On initializing, a message appears as shown.

       5. Once BACnet is Initialized, it will start exposing the BACnet objects and any other interoperable
           system when configured will be able to read all the exposed objects.