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Installation & Maintenance Manual IM702-0
Group: McQuay ControlsDate: September 2001
© 2001 McQuay International
MicroTech II™LonWorks® Communication Modules
Applied Rooftop Unit Controller
• Space Comfort Control (SCC) Module
• Discharge Air Control (DAC) Module
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ContentsFigures ................................................................................................................................................... 2Revision History.................................................................................................................................... 3Reference Documents............................................................................................................................ 3General Information .............................................................................................................. 4Description ............................................................................................................................................ 4Application ............................................................................................................................................ 5Component Data.................................................................................................................................... 6
Service Pin......................................................................................................................................... 6Light Emitting Diodes (LEDs)........................................................................................................... 6LonWorks Network Connector (P8).................................................................................................. 712-Pin Header.................................................................................................................................... 7LonMark Profile Software................................................................................................................. 7Neuron............................................................................................................................................... 7Transceiver ........................................................................................................................................ 7
Specifications ........................................................................................................................................ 7Installation.............................................................................................................................. 8Mounting ............................................................................................................................................... 8
Mounting a New MicroTech II LonWorks Communications Module on the MicroTech II MainControl Board .................................................................................................................................... 8Replacing a MicroTech II LonWorks Communications Module on the MicroTech II Main ControlBoard ................................................................................................................................................. 8
Integration ............................................................................................................................ 11Connecting to the Network.................................................................................................................. 11
Network Topology........................................................................................................................... 11Physical Network............................................................................................................................. 13
Addressing and Establishing Communications.................................................................................... 13LonWorks Network Addressing ...................................................................................................... 13Commissioning the Network ........................................................................................................... 14External Interface File (XIF) ........................................................................................................... 14
Configuring the Unit Controller .......................................................................................................... 14Service Information............................................................................................................. 15Test Procedures ................................................................................................................................... 15Replaceable Parts List ......................................................................................................................... 15
Network Connection Plug................................................................................................................ 15Kits and Wire Harness..................................................................................................................... 15
FiguresFigure 1. MicroTech II LonWorks Communications Module ............................................................... 5Figure 2. Building Automation System ................................................................................................. 5Figure 3. MicroTech II LonWorks Communications Module Major Components ............................... 6Figure 4. MicroTech II Applied Rooftop Unit Controller Main Control Board.................................... 8Figure 5. LonWorks Network Connection Schematic Diagram ............................................................ 9Figure 6. Mount LonWorks Communications Module........................................................................ 10Figure 7. Cable Harness Routing......................................................................................................... 10Figure 8. Singly Terminated Free Topology Networks ....................................................................... 11Figure 9. Combining Network Segments With a Repeater .................................................................. 12Figure 10. Doubly Terminated Network Topology ............................................................................. 12
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Revision HistoryIM702-0 September 26, 2001 Initial release
Reference DocumentsNumber Company Title
IM696 McQuayInternational
MicroTech II Applied Rooftop Unit ControllerInstallation Manual
OM137 McQuayInternational
MicroTech II Applied Rooftop Discharge Air ControllerOperation Manual
OM138 McQuayInternational
MicroTech II Applied Rooftop Space Comfort ControllerOperation Manual
ED15060 McQuayInternational
MicroTech II Protocol Information Data for McQuayInternational Applied Rooftop Units
078-0014-01E LonMarkInteroperabilityAssociation
LonMark Layers 1-6 Interoperability Guidelines, Version3.0
078-0120-01E LonMarkInteroperabilityAssociation
LonMark Application Layer Interoperability Guidelines,Version 3.2
8500_10 LonMarkInteroperabilityAssociation
LonMark Functional Profile: Space Comfort Controller,Version 1.0
8610_10 LonMarkInteroperabilityAssociation
LonMark Functional Profile: Discharge Air Controller,Version
078-0156-01G EchelonCorporation
LonWorks FTT-10A Free Topology Transceiver UsersGuide
NoticeCopyright © 2001 McQuay International, Minneapolis MN All rights reserved throughout the world.
McQuay International reserves the right to change any information contained herein without priornotice. No guarantees are given as to the accuracy of information provided.McQuay and MicroTech are registered trademarks of McQuay International. All other trademarks are the property of their respectiveowners.
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General Information
This manual contains the information you need to install the MicroTech II LonWorks®Communication Modules and integrate them into the network.
! WARNINGElectric shock hazard. Can cause personal injury or equipment damage.This equipment must be properly grounded. Connections and service to the MicroTech II controlpanel must be performed only by personnel that are knowledgeable in the operation of theequipment being controlled.
! CAUTIONStatic sensitive components. Can cause equipment damage.
Discharge any static electrical charge by touching the bare metal inside the control panel beforeperforming any service work. Never unplug cables, circuit board terminal blocks, or power plugswhile power is applied to the panel.
NOTICEThis equipment generates, uses and can radiate radio frequency energy and, if not installed andused 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 part15 of the FCC rules. These limits are designed to provide reasonable protection against harmfulinterference when the equipment is operated in a commercial environment. Operation of thisequipment in a residential area is likely to cause harmful interference in which case the user will berequired to correct the interference at his or her own expense. McQuay International disclaimsany liability resulting from any interference or for the correction thereof.
DescriptionA MicroTech II LonWorks Communications Module provides the interface between a MicroTech IIunit controller and a LonWorks Local Operating Network (LON). It translates the LonTalk variablesused on the network to the variables used in the unit controller and vice versa. Two versions areavailable: one in accordance with the LonMark Space Comfort Control (SCC) Functional Profile andone in accordance with the LonMark Discharge Air Control (DAC) Functional Profile. Profiles areinterpreted in loaded programs (firmware). Each profile is interpreted in a separate MicroTech IILonWorks Communications Module. This manual covers both.
Each MicroTech II LonWorks Communications Module is a printed circuit board that plugs onto theMicroTech II Main Control Board. Figure 1 is an outline drawing with dimensions of a printed circuitboard.
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Figure 1. MicroTech II LonWorks Communications Module
0.2506.750
0.250
3.750
ApplicationA MicroTech II LonWorks Communications Module connects the MicroTech II unit controller to theBuilding Automation System (BAS) on a LonWorks network. It is the interface adapter for theexchange of LonTalk variables between the network and the unit controller. The MicroTech IILonWorks Communications Module translates the LonWorks variables of the profile into the nativeinformation of the unit controller. Figure 2 shows the MicroTech II LonWorks CommunicationsModule and unit controller integrated into a BAS. Refer to the appropriate Unit Operation manual forkeypad details. See Reference Documents for part numbers.
Figure 2. Building Automation System
MicroTech IIMain ControlBoard
MicroTech IILonWorksCommunicationsModule
MicroTech IIKeypad
LonWorksInterfaceAdapter
LonWorks Work Station
LonWorksFTT-10ANetwork
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Component DataFigure 3 shows the location of the major components of the MicroTech II LonWorksCommunications Module.
Figure 3. MicroTech II LonWorks Communications Module Major Components
J6
P8
DS1
DS2
DS3
SW1
12-Pin HeaderService Pin
P8 Connector
Light Emitting Diodes
1 2 3
Service PinThe service pin, switch SW1, generates a service pin message, which contains the Neuron ID and theprogram code identification of the node. A service pin message is a network message that is generatedby a node and broadcast on the network. It can be used to commission the LonWorks network.
Light Emitting Diodes (LEDs)The communications module has three LEDs to indicate communication activity and status of thecommunication module.
LED Function
DS1 • Lights when the service pin is pressed• Lights when there is a problem with the module
DS2 • On Steady during normal operation• Blink during a Wink command
DS3 • Flicker during Communications Activity• Blink during a Wink command
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LonWorks Network Connector (P8)The P8 connector connects the MicroTech II LonWorks Communications Module to the LonWorksFTT-10A bus.
Pin Designation Function
1 None No Connection
2 - (minus sign) FTT-10A
3 + (plus sign) FTT-10B
12-Pin HeaderThe 12-pin header, J6, connects the unit controller Main Control Board to the LonWorkscommunications module through the bottom of the communications module.
LonMark Profile SoftwareThe MicroTech II LonWorks Communications Module software translates the Standard NetworkVariable Types (SNVTs) and Standard Network Configuration Parameters (SCPTs) in accordancewith the LonMark profiles used on the LonWorks network into the variables and parameters used inthe MicroTech II Main Control Board and conversely.
NeuronThe basis of the communications module is an Echelon Neuron chip. Each Neuron chip stores aglobally (i.e., worldwide) unique, 48-bit serial number called the Neuron ID. The Neuron ID can beused to address the device on the LonWorks network.
TransceiverThe Echelon Corporation Free Topology Transceiver (FTT-10A) is used to communicate on theLonWorks network. The network topology may consist of a: star, daisy-chain, or other topology. Datatransmission 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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Installation
The MicroTech II LonWorks Communications Module can be installed in the field or it can beinstalled in the factory. The module mounts on connector pins and is held in place with four plasticlocking standoffs. A cable harness connects the MicroTech II LonWorks Communications Module tofield wiring terminals and the LonWorks network at a terminal block in the unit cabinet assembly.
MountingThe MicroTech II LonWorks Communications Module is included in a kit along with a cable harness(Part number 090011184) and this manual.
Mounting a New MicroTech II LonWorks Communications ModuleTo mount a new MicroTech II LonWorks Communications Module1. Remove power from the Main Control Board.2. Remove the plug-in connector terminal block in P8. See Figure 3.3. Locate the blank connector and four standoffs for the MicroTech II LonWorks Communications
Module on the Main Control Board. See Figure 4.4. Orient the printed circuit board so that the side with the components faces out and connector pins
can penetrate the connector on the board.5. Push the board onto the connector pins and standoffs until you hear the faint click of the locking
standoffs securing the board in place.6. Connect the MicroTech II LonWorks Communications Module to the network with wire harness
(part number 0900112-83). See Figure 5.a. Connect the cable harness white/blue wire (No. 522) to the + terminal of the P8 connector
and connect the blue wire (No. 523) to the – terminal of the P8 connector. No wire isconnected to the remaining terminal of P8.
b. Route the cable harness down to the shelf below the controller and to the left along the shelfto the edge. Route the cable through a hole down the raceway to Terminal Block TB2.
c. Connect the cable harness white/blue wire (No. 522) to terminal 128 of TB2 and connect theblue wire (No. 523) to terminal 129 of TB2.
7. Connect the network to TB 2 terminals 128 and 129.
Replacing a MicroTech II LonWorks Communications ModuleTo replace a MicroTech II LonWorks Communications Module1. Remove power from the Main Control Board.2. Remove the connector in P8. See Figure 3.3. Locate the four standoffs for the MicroTech II LonWorks Communications Module on the Main
Control Board.4. Use a pliers or screwdriver to depress the barb on one standoff and gently pull the corner of the
board over the barb. Be careful to not bend the board or misalign the connector pins.5. Proceed to the other three corners and pull the board over the standoffs.6. Gently lift the MicroTech II LonWorks Communications Module from the MCB.7. Locate the blank connector and four standoffs for the MicroTech II LonWorks Communications
Module on the Main Control Board. See Figure 4.8. Orient the board so that the side with the components faces out and connector pins can penetrate
the connector on the board.9. Push the board onto the connector pins and standoffs until you hear the faint click of the locking
standoffs securing the module in place.10. Connect the MicroTech II LonWorks Communications Module to the network.
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a. Replace the network plug in P8. See Figure 3.11. Reconnect the network to TB 2 terminals 128 and 129 if it is necessary.
Figure 4. MicroTech II Applied Rooftop Unit Controller Main Control Board
Location of Standoff(4 places)
Terminal Block Connector
Main Control Board
Connector
Figure 5. LonWorks Network Connection Schematic Diagram
522
523
LonWorksCommunications
Module
MainControlBoard(MCB)
-
+
UnitTerminal
BlockTb2
128
129LonWorks Network
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Figure 6. Mount LonWorks Communications Module
12-Pin Header
Locking Standoff
Communications Module
Figure 7. Cable Harness Routing
LonWorksComunicationsModule
Controller
Cable Shelf
Cable Raceway
Terminal Block TB2
Network Cable
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Integration
Integrating the MicroTech II LonWorks Communications Module into a BAS involves three steps:connecting the unit (node) to the network, addressing and establishing communications with the unit,and configuring the unit to the building.
Connecting to the NetworkAfter you have installed the MicroTech II LonWorks Communications Module in the unit, you mustconnect it into the LonWorks network.
Network TopologyEach MicroTech II LonWorks Communications Module is equipped with an FTT-10A transceiver fornetwork communications. This transceiver allows for (1) free topology network wiring schemes usingtwisted pair (unshielded) cable and (2) polarity insensitive connections at each node. These featuresgreatly simplify installation and reduce network commissioning problems. Additional nodes may beadded with little regard to existing cable routing.
Free Topology NetworksA LonWorks “free topology network“ means that devices (nodes) can be connected to the network ina variety of geometric configurations. For example, devices can be daisy-chained from one device tothe next, connected with stub cables branching off from a main cable, connected using a tree or startopology, or any of these configurations can be mixed on the same network. As shown in Figure 8.Free topology segments require termination for proper transmission performance. Only onetermination is required. It may be placed anywhere along the segment. Refer to Echelon LonWorksFTT-10A Transceiver User’s Guide. See Reference Documents for part number.
Free topology networks may take on the following topologies:• Bus• Ring• Star• Mixed - Any combination of Bus, Ring, and Star
Note: A Limitations to wire lengths apply and must be observed.
Figure 8. Singly Terminated Free Topology Networks
Termination
Star Topology
Termination
Ring Topology
Termination
Singly Terminated Bus TopologyStub
}
Termination
Mixed Topology
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network segment is any part of the free topology network in which each conductor is electricallycontinuous. Each of the four diagrams in is a illustration of a network segment. Some applicationsmay require two or more segments; see “Free Topology Restrictions.”. If necessary, segments can bejoined with FTT-10A-to-FTT-10A physical layer repeaters. See Figure 9. Refer to EchelonLonWorks FTT-10A Transceiver User’s Guide. See Reference Documents for part number.
Figure 9. Combining Network Segments With a Repeater
Termination Termination
FTT-
10A
FTT-
10A
Free Topology RestrictionsAlthough free topology wiring is very flexible, there are restrictions. A summary follows, refer to theEchelon FTT-10A User’s Guide for details. See Reference Documents for part number.1. The maximum number of nodes per segment is 64.2. The maximum total bus length depends on the wire size (see “Qualified Cables” for details):
Wire Size Maximum Node-to-Node Length Maximum Cable Length24 AWG 820 ft (250 m) 1476 ft (450 m)
22 AWG 1312 ft (400 m) 1640 ft (500 m)
16 AWG 1640 ft (500 m) 1640 ft (500 m)
The longest cable path between any possible pair of nodes on a segment must not exceed themaximum node-to-node distance. If two or more paths exist between a pair of nodes (e.g., a looptopology), the longest path should be considered. Note that in a bus topology, the longest node-to-node distance is equal to the total cable length.a. The total length of all cable in a segment must not exceed the maximum total cable length.
3. One termination is required in each segment. It may be located anywhere along the segment.
Doubly Terminated NetworksYou can extend the maximum total cable length without using a repeater by using doubly-terminatednetwork topology. See Figure 10. The trade-offs are (1) this network topology must be rigorouslyfollowed during the installation and subsequent retrofits and (2) two terminations must be installed atthe ends of the bus for proper transmission performance. Refer to Echelon LonWorks FTT-10ATransceiver User’s Guide. See Reference Documents for part number.
Note: Limitations to wire lengths apply and must be observed.
Figure 10. Doubly Terminated Network Topology
Termination Termination
Doubly Terminated Topology RestrictionsThe restrictions on doubly-terminated bus topology are as follows:1. The maximum number of nodes per segment is 64.
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2. The maximum total bus length depends on the wire size (see “Qualified Cables” for details):Wire Size Maximum Cable Length24 AWG 2952 ft (900 m)
22 AWG 4590 ft (1400 m)
16 AWG 8855 ft (2700 m)
3. The maximum stub length is 9.8 ft (3 m). The length of the cable harness stub is 7.2 ft (2.19 m).
Note: A stub is a piece of cable that is wired between the node and the bus. See A Limitations towire lengths apply and must be observed.
Figure 8. Note that if the bus is wired directly to the node, there is no stub, and thus the stublength is zero. If you are wiring to a field terminal strip on a unit, be sure to account for anyfactory wiring between the terminal strip and the controller. This wiring is considered part of thestub.
4. Two terminations are required in each segment. One must be located at each end of the bus.
Physical Network
Qualified CablesEchelon has qualified three twisted-pair network communications cables that are available from alarge number of different sources. Refer to Echelon LonWorks FTT-10A Free TopologyTransceiver Users Guide. See Reference Documents for part number. Some local codes orapplications may require the use of plenum rated cable. The following cables meet this specification.
1. TIA568A Category 5 cable (24AWG/0.51mm)2. NEMA Level IV cable (22AWG/0.65mm)3. Generic 16AWG (1.3mm) (similar to Belden 85102)
Do not install the cable in the same conduit with power wiring. The temperature of the cable must notexceed 131°F (55°C).
Note: Ideally, you should connect two controllers with one continuous piece of cable in orderto reduce the risk of communications errors. If you must splice the cable, use crimp-typebutt connectors (good) or solder (best). Do not use wire nuts.
Network Cable TerminationLonWorks network segments require termination for proper data transmission performance. The typeand number of terminations depend on network topology. Refer to Echelon LonWorks FTT-10ATransceiver User’s Guide. See Reference Documents for part number.
Addressing and Establishing Communications
LonWorks Network AddressingEvery Neuron Chip has a unique 48-bit Neuron ID or physical address. This address is generally usedonly at initial installation or for diagnostic purposes. For normal network operation, a device addressis used.
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Device addresses are defined at the time of network configuration. All device addresses have threeparts. The first part is the Domain ID, designating the domain. Devices must be in the same domain inorder to communicate with each other. The second part is the Subnet ID that specifies a collection ofup to 127 devices that are on a single channel or a set of channels connected by repeaters. There maybe up to 255 subnets in a domain. The third part is the Node ID that identifies an individual devicewithin the subnet.
A group is a logical collection of devices within a domain. Groups are assembled with regard for theirphysical location in the domain. There may be up to 256 groups in a domain. A group address is theaddress that identifies all devices of the group. There may be any number of devices in a group whenunacknowledged messaging is used. Groups are limited to 64 devices if acknowledged messaging isused.
A broadcast address identifies all devices within a subnet or domain.
Commissioning the NetworkPressing the service pin, switch SW1, generates a service pin message, which contains the Neuron IDand the program code identification of the node. A service pin message is a network message that isgenerated by a node and broadcast on the network. It can be used to commission the LonWorksnetwork.A network configuration tool maps device Neuron IDs to the domain/subnet/node logical addressingscheme when it creates the network image, the logical network addresses and connection informationfor all devices (nodes) on the network.
External Interface File (XIF)LonMark guidelines specify exact documentation rules so that proprietary configuration tools are notrequired to commission and configure LonWorks devices. The MicroTech II LonWorks AppliedRooftop Communications Module is self-documenting so that any network management tool canobtain all the information needed over the network to connect it into the system and to configure andmanage it. An external interface file (a specially formatted PC text file with an extension .XIF) is alsoavailable so that any network tool can design and configure it prior to installation. For a copy of theXIF file contact your local McQuay International representative.
Configuring the Unit ControllerThe MicroTech II Applied Rooftop Controller LonWorks Communications Module is configured atthe factory as a rooftop unit in accordance with either the LonMark Discharge Air Control (DAC) orLonMark the Space Comfort Control (SCC) functional profile. The unit is ready to operate with thedefault values of the various parameters set at the factory. Default values may be changed with theunit’s keypad or via the network. See the appropriate operation manual for default values and keypadoperation instruction and see the MicroTech II Applied Rooftop Protocol Information Data fordescriptions of the network variables. See Reference Documents for part numbers.
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Service Information
Test ProceduresIf you can control the from the unit’s keypad, but you are not able to communicate with unit via thenetwork:• Check the network wiring• Check the cable harness to the network terminals• Check addressing
Press the Service Pin on the communications module to send the service message to thenetwork.
The service pin message contains the Neuron ID and the program code identification of thenode.
If the MicroTech II Applied Rooftop LonWorks Communications Module still does not respond,replace the communications module.
Replaceable Parts List
Network Connection Plug
Generic Replacement PartsThe three-contact network connector plug has custom markings, but if you lose this terminal blockyou can replace it with a standard block without the markings from a manufacturer. The list belowcontains manufacturers part numbers for equivalent parts without the custom markings.
Manufacturer Telephone Order Number
Phoenix Contact (800) 888-7388 17 57 02 2
Altech Corp (908) 806-9400 37.003
Direct Replacement PartsYou can order direct replacement parts for these connector plugs from McQuay International (1-800-37-PARTS).
Part Number Description
AP-TBN3COM-0 10 terminal blocks marked LON A, LON B, and SHIELD
AS-TBKIT-0 5 terminal blocks marked REF, N2- and N2+ and
5 terminal block marked 24VAC, COM and ZBUS
Kits and Wire Harness
Component Description Part No.
Kit, SCC Installation Kit for LonMark SCC Communications Module 0900167-03
Kit, DAC Installation Kit for LonMark DAC Communications Module 0900167-04
Wire Harness Wire harness for LonMark Communications Modules 0900111A84
13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (612) 553-5330
