During my work with Maurice on controlling a VFD with the T3000, I learned about Bacnet Instance numbers. Normally the control software references a Bacnet-IP address that contains the last octet of the VFD. (or whatever BacNet device you’re trying to read) But it turns out that every Bacnet device on the network has a unique “Instance Number”. Here are the advantages to using the instance number in your T3000 program.
- The syntax is simpler. It’s referred to as just the instance number concatenated with the Bacnet AV,AI or AO and the Bacnet object number.
- Finding the instance number is a snap with the T3000’s built-in Yabe (Bacnet Tool). All you have to do is explore your network with the tool and it will list the devices with their instance numbers in parentheses. Then just click on the list and you’ll see a list of all the device’s readable or writeable objects.
- Finally, you can set all your Bacnet devices to use DHCP to assign their IP addresses on the fly. The instance number will be the same. (Maurice, please confirm this)
The ability to use instance numbers is a relatively new feature in the the T3000 software, so be sure to update your software and firmware