Switchable Communications protocols - Metasys - MS-VMA1615 - MS-VMA1626 - MS-VMA 1628 - MS-VMA1630 - Field Device - VMA16 VAV Modular Assembly

VMA1615/1626/1628/1630 VAV Controllers Installation Guide

Product name
VMA16 VAV Modular Assembly
Document type
Installation Guide
Part number
Document revision
Revision date

The Metasys® system Field Equipment Controller (FEC) family controllers and network sensors communicate using the standard BACnet® protocol, based on the ANSI/ASHRAE 135-2008. The BACnet protocol is a standard for ANSI, ASHRAE, and the International Standards Organization (ISO) for building controls.

VMA16, VMA18 controllers are BTL-listed as BACnet Application Specific Controllers (B-ASCs).

The Controller Configuration Tool (CCT) can be used to switch the Field Bus communications protocol in supported FEC, FAC, and VMA controllers to be either the standard BACnet MS/TP or the N2 protocol. All new controllers use either BACnet MS/TP as the default communications protocol, or BACnet/IP. Switchable communications protocols in the MS/TP models provide a cost-effective upgrade and modernization path for customers with existing N2 controllers.

The N2-capable FEC Family Controllers can be used as functional replacements for legacy N2 controllers. The N2-capable FEC Family Controllers:
  • have the input and output (I/O) quantities and characteristics of the FEC Family Controllers
  • must be programmed with CCT, which has similar, but not identical programming capabilities as HVACPro, GX9100, GPL, and other legacy tools
  • support SA Bus devices
  • support WRZ wireless sensors from the controller using the WRZ-7860 receiver (most models)
  • are available in Buy American versions (most models)
The N2-capable FEC family controllers:
  • do not support Zone Bus (for example, TMZ sensors and M100 actuators) or XT-Bus (System 91) devices (for example, XT, XTM, and XP modules)
  • do not support a wireless connection to the N2 bus
  • do not support NxE passthrough