CAS can provide the open source design, free sample code and a free to use no royalty library which makes the device talk BACnet. The device supports 2xBO 2xBI and 2xAV. Connect the chip pins to the signal conditioning circuit you add or use them as they are.
Using this platform CAS was able to develop a $75 device used to monitor the dry contact on the back of a fire alarm panel. Our customer needed to monitor 2400 panels in separate dwellings. Price and BACnet support were the two most important issues.
modbusbacnet 