BACnet Broadcast Distribution Table Example

By Matt

Setting up a BBMD-connected network is a manual and somewhat arcane process. The broadcast distribution table is a list of the BBMDs on the network. Each BBMD on each network should have the same broadcast distribution table. Here’s a quick example of a BACnet broadcast distribution table (BDT) that might help clear things up. The…

Example BACnet Network Number & Instance Number Convention

By Matt

When I assign a BACnet instance number or BACnet network number, I never use the defaults provided by whatever product I’m using. A few moments of thought about some kind of standard for your site can save you a lot of time down the road when you want to expand your system to include more…

What is a BACnet Instance Number?

By Matt

A BACnet Instance Number Is a Globally-unique Address An often misunderstood and neglected topic is the BACnet instance number of a BACnet device. Neglecting to think about this number at installation might not bite you today, but it remains as technical debt that complicates future work. It’s a number that identifies a device uniquely on…

What is a BBMD, and Why Do We Need It?

By Matt

BACnet networks are getting big. Infrastructure is getting complicated. BACnet is used to connect campuses, not just buildings. When you connect several networks together, BACnet/IP Broadcast Management Devices (BBMD) are necessary to bridge them. They’re important, but often misunderstood. Use them wrong, and you’ll get a broadcast storm. What is a BBMD? Broadcasts are efficient.…