Switchable Communications Protocols

The Metasys® system FEC Family Controllers and

network sensors communicate using either the standard

BACnetprotocol, based ontheANSI/ASHRAE135-2004.

or the BACnet/IP protocol. The BACnet protocol is a

standard for ANSI, ASHRAE, and the International

Standards Organization (ISO) for building controls.

MostFEC,VMA16.VMA18.andIOMfieldcontrollersare

BTL-listed as BACnet Application Specific Controllers

(B-ASCs). FAC field controllers and the VMA1930 Field

Controller are BTL-listed as BACnet Advanced Application

Controllers (B-AACs).

Release 10.3 and Release Module (RM) 10.2 of the

Controller Configuration Tool (CCT) can be used to switch

the Field Bus communications protocol in supported FEC,

FAC and VMAcontrollers to be either the standard

BACnetMSTPortheN2protocol.Allnewcontrollersuse

BACnet MSTP as the default communications protocol.

Switchable communications protocols in the MSTP

models provide a cost-effective upgrade and

modernization path for customers with existing N2

controllers.