McQuay IM 702-3 Installation Manual
Installation and Maintenance Manual
IM 702-3
Group: Controls
Part Number: IM 702-3
Date: November 2004
Supersedes: IM 702-2
MicroTech II
TM
Applied Rooftop Unit Controller and
Self-Contained Unit Controller
LonWorks® Communication Module
•<Space Comfort Controller (SCC) Module
•<Discharge Air Controller (DAC) Module
Use this manual to physically install the communications module into the unit and connect the unit to your
network. You also need the appropriate McQuay Engineering Data Sheet known as the Protocol Data Packet to
integrate the unit into your network. The Protocol Data Packet contains addressing details, BACnet® and
LonWorks® protocol information, and a list of the data points available to the network. See the Reference
Documents section of this document for part numbers of Protocol Data Packets. These documents are available
from your local McQuay International representative and for downloading at the McQuay International web site:
www.mcquay.com.
© 2004 McQuay International
NOTICE
Table of Contents
Reference Documents ................................................................................................................................................................3
General Information ............... ..... .. ......................................................................................................................................4
Description ................................................................................................................................................................................4
Application ................................................................................................................................................................................5
Component Data ........................................................................................................................................................................5
Service Pin ....................................... .. ......................................................................................................................................5
Specifications ............................................................................................................................................................................6
Installation ............................... ..... .. ......................................................................................................................................7
Mounting ...................................................................................................................................................................................7
Mounting a New MicroTech II LonWorks Communications Module ......................................................................................7
Replacing a MicroTech II LonWorks Communications Module ..............................................................................................7
Integration ................................ ..... .. ....................................................................................................................................12
Network Connection ................................................................................................................................................................12
Network Topology .......................... .. ....................................................................................................................................12
Free Topology Networks ................. .. ....................................................................................................................................12
Free Topology Restrictions ............. .. ....................................................................................................................................13
Doubly Terminated Networks ......... .. ....................................................................................................................................13
Doubly Terminated Topology Restrictions .............................................................................................................................14
Addressing and Establishing Communications .......................................................................................................................14
LonWorks Network Addressing ...... .. ....................................................................................................................................14
Commissioning the Network ........... .. ....................................................................................................................................14
External Interface File (XIF) ........... .. ....................................................................................................................................15
Configuring the Unit Controller ..............................................................................................................................................15
Service Information ................. ..... .. ....................................................................................................................................16
Test Procedures .......................................................................................................................................................................16
Replaceable Parts List .............................................................................................................................................................16
Network Connection Plug ............... .. ....................................................................................................................................16
Kits and Wire Harness .................... .. ....................................................................................................................................16
Warranty .................................. ..... .. ....................................................................................................................................17
2 IM702-3
Notice
© 2004 McQuay International, Minneapolis MN. All rights reserved throughout the world.
McQuay International reserves the right to change any information contained herein without prior notice. The user is
responsible for determining whether this product is appropriate for his or her application.
The following are trademarks or registered trademarks of their respective companies. Windows from Microsoft
Corporation; BACnet from ASHRAE; LONWORKS from Echelon Corporation; McQuay, MicroTech II from McQuay
International.
Reference Documents
Number Company Title
IM696 McQuay International MicroTech II Applied Rooftop Unit Controller Installation Manual
OM137 McQuay International MicroTech II Applied Rooftop Discharge Air Controller Operation Manual
OM138 McQuay International MicroTech II Applied Rooftop Space Comfort Controller Operation Manual
IM710 McQuay International MicroTech II Vertical Self-Contained Unit Controller Installation Manual
OM711 McQuay International MicroTech II Vertical Self-Contained Discharge Air Controller Operation Manual
OM712 McQuay International MicroTech II Vertical Self-Contained Space Comfort Controller Operation Manual
ED15060 McQuay International MicroTech II Protocol Information Data for McQua y International Applied Rooftop Units
ED15061 McQuay International MicroTech II Protocol Information Data for McQuay International Self-Contained Units
078-0014-01E LonMark Interoperability Assoc. LonMark Layers 1-6 Interoperability Guidelines, Version 3.0
078-0120-01E LonMark Interoperability Assoc. LonMark Application Layer Interoperability Guidelines, Version 3.2
8500_10 LonMark Interoperability Assoc. LonMark Functional Profile: Space Comfort Controller, Version 1.0
8610_10 LonMark Interoperability Assoc. LonMark Functional Profile: Discharge Air Controller, Version
078-0156-01G Echelon Corporation LonWorks FTT-10A Free Topology Transceiver Users Guide
McQuay International documents are available at www.mcquay.com.
IM702-3 3
General Information
This manual contains the information you need to install the communication modules and incorporate it into the network,
and maintain it.
! WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Connections and service to the MicroTech II control panel must be
performed only by personnel who are knowledgeable in the operation of the equipment being controlled.
! CAUTION
Static sensitive components. Can cause equipment damage.
Discharge any static electrical charge by touching the bare metal inside the control panel before performing any
service work. Never unplug cables, circuit board terminal blocks, or power plugs while power is applied to the panel.
NOTICE
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with this instruction manual, may cause interference to radio communications. It has been tested and found to comply
with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his or her own expense. McQuay International disclaims any liability resulting
from any interference or for the correction thereof.
Description
A MicroTech II LonWorks Communications Module provides the interface between a MicroTech II unit controller and a
LonWorks Local Operating Network (LON). It translates the LonTalk variables used on the network to the variables used in
the unit controller and vice versa. Two versions are available: one in accordance with the LonMark Space Comfort Control
(SCC) Functional Profile and one in accordance with the LonMark Discharge Air Control (DAC) Functional Profile.
Profiles are interpreted in loaded programs (firmware). Each profile is interpreted in a separate MicroTech II LonWorks
Communications Module. This manual covers both.
Each MicroTech II LonWorks Communications Module is a printed circuit board that plugs onto the MicroTech II Main
Control Board. Figure 1 is an outline drawing with dimensions of a printed circuit board.
Figure 1. MicroTech II LonWorks Communications Module
3.750
0.250
IM702-3 4
0.250
6.750
Application
A MicroTech II LonWorks Communications Module connects the MicroTech II unit controller to the Building Auto mation
System (BAS) on a LonWorks network. It is the interface adapter for the exchange of LonTalk variables between the
network and the unit contr oller. The MicroTech I I LonWorks Co mmunicatio ns Module tra nslates the LonWorks var iables
of the profile into the native information of the unit controller. Figure 2 shows the MicroTech II LonWorks
Communications Module and unit controller integrated into a BAS. Refer to the appropriate Unit Operation manual for
keypad details. See Reference Documents for part numbers.
Figure 2. Building Automation Sys tem
LonWorks
FTT-10A
Network
MicroTech II
Main Control
Board
MicroTech II
LonWorks
Communications
Module
MicroTech II
Keypad
LonWorks Work S tation
LonWorks
Interface
Adapter
Component Data
Figure 3 shows the location of the major components of the MicroTech II LonWorks Communications Module.
Figure 3. MicroTech II LonWork s Communicati ons Modu le Ma jor Compo nen ts
Service Pin
SW1
J6
12-Pin Header
Light Emitting Diodes
123
P8 Connector
Service Pin
The service pin, switch SW1, generates a service pin message, which contains the Neuron ID and the program code
identification of the node. A service pin message is a network message that is generated by a node and broadcast on the
network. It can be used to commission the LonWorks network.
IM702-3 5
P8
DS1
DS2
DS3
Light Emitting Diodes (LEDs)
The communications module has three LEDs to indicate communication activity and status of the communication module
LED Function
DS1
DS2
DS3
• Lights when the service pin is pressed
• Lights when there is a problem with the module
• On Steady during normal operation
• Blink during a Wink command
• Flicker during Communications Activity
• Blink during a Wink command
LonWorks Network Connector (P8)
The P8 connector connects the MicroTech II LonWorks Communications Module to the LonWorks FTT-10A bus
Pin Designation Function
1 None No Connection
2 - (minus sign) FTT-10A
3 + (plus sign) FTT-10B
12-Pin Header
The 12-pin header, J6, connects the unit controller Main Control Board to the LonWorks communications module through
the bottom of the communications module.
LonMark Profile Software
The MicroTech II LonWorks Communications Module software translates the Standard Network Variable Types (SNVTs)
and Standard Network Configuration Parameters (SCPTs) in accordance with the LonMark profiles used on the LonWorks
network into the variables and parameters used in the MicroTech II Main Control Board.
Neuron
The basis of the communications module is an Echelon Neuron chip. Each Neuron chip stores a globally (i.e., worldwide)
unique, 48-bit serial number called the Neuron ID. The Neuron ID can be used to address the device on the LonWorks
network.
Transceiver
The Echelon Corporation Free Topology Transceiver (FTT-10A) is used to communicate on the LonWorks network. The
network topology may consist of a: star, daisy-chain, or other topology. Data transmission rate on the network is 78 kbps
(baud).
Specifications
Characteristic Description
Network Topology Flexible Free Topology
Neuron Chip Processor 3150
Free Topology Transceiver (FTT-10A) 50051
Cable Types TIA Category 5 (recommended)
Maximum Bus Length 1476 ft (450) meters per segment
Maximum Node Separation 820 ft (250 meters)
Data Transmission Two-wire, half duplex
Data Transmission Rate 78 kbps (baud)
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