During his term the number of committee working groups grew to 11, pursuing areas such as support for lighting, access control, energy utility/building integration, and wireless communications. In January 2006 the BACnet Manufacturers Association and the BACnet Interest Group of North America combined their operation in a new organization called BACnet International . In June 2008, in Salt Lake City, Dave Robin from Automated Logic Corporation took over the reins as the new committee chair after serving 4 years as vice chair. During Dave's term, 22 addenda were published for the 135-2008 standard and republished as . Several addenda were published for 135-2010 and the standard was republished as . In June 2012, in San Antonio, Carl Neilson from Delta Controls took over the reins as the new committee chair after serving 4 years as vice chair. During Carl's term, 12 addenda were published for the 135-2012 standard and it was republished as . Carl stepped down as chair in June 2015. In June 2015, Bernhard Isler, from Siemens, became chair after serving 3 years as vice chair and 4 years as secretary. During Bernhard's term, 10 addenda were published for the 135-2016 standard. Once addenda to 135.1-2013 was also published. Bernhard stepped down as chair in June 2018. In June 2018, Michael Osborne from Reliable Controls, became chair after serving 3 years as secretary and 3 years as vice chair. Protocol overview The BACnet protocol defines a number of services that are used to communicate between building devices. The protocol services include Who-Is, I-Am, Who-Has, I-Have, which are used for Device and Object discovery. Services such as Read-Property and Write-Property are used for data sharing. As of ANSI/ASHRAE , the BACnet protocol defines 60 object types that are acted upon by the services. The BACnet protocol defines a number of data link and physical layers, including ARCNET, Ethernet, BACnet/IP, BACnet/IPv6, BACnet/MSTP, point-to-point over RS-232, multidrop serial bus with token passing over RS-485, Zigbee, and LonTalk. BACnet objects ANSI/ASHRAE 135-2016 specifies 60 standard object types: Access Credential Access Door Access Point Access Rights Access User Access Zone Accumulator Alert Enrollment Analog Input Analog Output Analog Value Averaging Binary Input Binary Lighting Output Binary Output Binary Value BitString Value Calendar Channel CharacterString Value Command Credential Data Input Date Pattern Value Date Value DateTime Pattern Value DateTime Value Device Elevator Group Escalator Event Enrollment Event Log File Global Group Group Integer Value