ZFR1800 Series Wireless Field Bus System Technical Bulletin 7
• missing data would invalidate reporting required by the customer
• security points are monitored
ZFR1800 Series Wireless Field Bus System Overview
The ZFR1800 Series Wireless Field Bus System uses ZigBee technology for
wireless monitoring of HVAC equipment using the BACnet® protocol. The
system creates a wireless mesh network that enhances reliability and provides a
resilient self-healing capability by using automatically forming multiple
transmission paths for the data.
The Master-Slave/Token-Passing (MS/TP) trunk and device limits for supported
Network Automation Engine (NAE) and Network Control Engine (NCE) models
are the same for hard-wired products, wireless products, or a combination of hard-
wired and wireless products.
The wireless mesh network is independent of any building infrastructure and does
not require any preexisting wireless infrastructure.
Any of the following Metasys® field controllers can be wirelessly enabled using a
ZFR1811 Wireless Field Bus Router:
• Field Equipment Controllers (FEC) - FEC16 or FEC26
• Advanced Application Field Equipment Controllers (FAC) - FAC26 or FAC36
• Input/Output Module (IOM) - IOM17, IOM27, IOM37, or IOM47
• Variable Air Volume (VAV) Modular Assembly (VMA) - VMA16
The wireless components are transparent to the supervisory controller and require
no special setup procedure to discover, map, and integrate the Wireless Enabled
Field Controllers (WEFCs).
Note: The devices within the ZFR1800 Series Wireless Field Bus System are
designed for indoor, intra-building applications only.
Note: A successful ZFR1800 Series Wireless Field Bus System requires that a
minimum wireless signal strength is maintained between system
components. Component location is an important part of system design.
Distance, metal objects, and other obstructions can reduce or completely
block the wireless signal transmissions.
An example of a ZFR1800 Series Wireless Field Bus System is shown in Figure 1.
IMPORTANT: A Network Engine reports an offline alarm within a fixed
period of time when an associated MS/TP field controller goes offline. For a
hard-wired FEC, FAC, IOM, or VMA field controller, this time period is usually
20 seconds. For a wireless-enabled FEC, FAC, IOM, or VMA field controller
within the ZFR1800 Wireless Field Bus system, this time period is 5 minutes.
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