Installation & Maintenance Manual IM704-0

Group: McQuay ControlsDate: October 2001

© 2001 McQuay International

MicroTech II™BACnet Communication Module – MSTP

•

2 IM704-0

ContentsFigures ................................................................................................................................................... 2Revision History.................................................................................................................................... 3Reference Documents............................................................................................................................ 3General Information .............................................................................................................. 4Description ............................................................................................................................................ 5Application ............................................................................................................................................ 5Component Data.................................................................................................................................... 6

Light Emitting Diodes (LEDs)........................................................................................................... 7BACnet MSTP Network Connector (P1) .......................................................................................... 7Address Switch .................................................................................................................................. 712-Pin Header.................................................................................................................................... 7

Installation.............................................................................................................................. 8Mounting ............................................................................................................................................... 8

Mounting a new MicroTech II BACnet MSTP Communications Module on the Main ControlBoard ................................................................................................................................................. 8Replacing a MicroTech II BACnet MSTP Communications Module on the MicroTech II MainControl Board .................................................................................................................................... 9Replacing the MicroTech II BACnet MSTP Communications Module on a MicroTech II AuxiliaryControl Board .................................................................................................................................. 13

Integration ............................................................................................................................ 14Network Connection............................................................................................................................ 14Configuring the Unit Controller .......................................................................................................... 14Service Information............................................................................................................. 15Test Procedures ................................................................................................................................... 15Replaceable Parts List ......................................................................................................................... 15

Network Connection Plug................................................................................................................ 15Kits and Wire Harness..................................................................................................................... 15

FiguresFigure 1. BACnet MSTP Communications Module .............................................................................. 5Figure 2. Building Automation System ................................................................................................. 5Figure 3. MicroTech II BACnet MSTP Communications Module Major Components ........................ 6Figure 4. LonMark Communications Module Main Control Board .................................................... 10Figure 5. Mount BACnet MSTP Communications Module ................................................................ 11Figure 6. BACnet MSTP Connection Schematic Diagram.................................................................. 11Figure 7. BACnet MSTP Network Cable Routing .............................................................................. 12Figure 8. MicroTech II Auxiliary Control Board ................................................................................ 13

IM704-0 3

Revision HistoryIM704-0 October 5, 2001 Preliminary release

Reference DocumentsNumber Title

IM696 MicroTech II Applied Rooftop Unit Controller Installation Manual

OM137 MicroTech II Applied Rooftop Discharge Air Controller Operation Manual

OM138 MicroTech II Applied Rooftop Space Comfort Controller Operation Manual

ED15060 MicroTech II Protocol Information Data Applied Rooftop

ANSI/ASHRAE135-1995

BACnet A Data Communication Protocol for Building Automation andControl Networks

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.

4 IM704-0

General Information

This manual contains the information you need to install this communications module, incorporate itinto the network, and maintain it.

! 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.

IM704-0 5

DescriptionA MicroTech II BACnet MSTP Communications Module incorporates a MicroTech II unit controllerinto an BACnet MSTP Local Area Network (LAN). It is the interface to the network to BuildingAutomation Network using BACnet objects.

The MicroTech II BACnet MSTP Communications Module is a printed circuit board that plugs ontothe MicroTech II Main Control Board. Figure 1 shows an outline drawing of the BACnet MSTPcommunications module.

Figure 1. BACnet MSTP Communications Module

ApplicationThe MicroTech II BACnet MSTP Communications Module connects the MicroTech II unit controllerto the building automation system (BAS) on a BACnet MSTP Local Area Network. It is the interfaceadapter for the exchange of BACnet objects between the network and the unit controller. Figure 2shows the communications module and unit controller integrated into a BAS.

Figure 2. Building Automation System

MicroTech IIMain ControlBoard

BACnet MSTPCommunicationsModule

MicroTech IIKeypad

BACnet MSTPNetwork

6 IM704-0

Component DataFigure 3 shows the major components of the communications module.

Figure 3. MicroTech II BACnet MSTP Communications Module Major Components

123

O P E N

J1

P1 SG1

SW1

DS1 DS2

12 Pin Header

Address Switch SW1

Network Connector Plug

Transmit LED, DS1

Receive LED, DS2

IM704-0 7

Light Emitting Diodes (LEDs)The MicroTech II BACnet MSTP Communications Module has two LEDs to indicate communicationactivity and status of the communication module.

LED Function

DS1 Lights when the communications module is receiving data

DS2 Lights when the communications module is transmitting data

BACnet MSTP Network Connector (P1)The P1 connector connects the MicroTech II BACnet MSTP Communications Module to the BACnetMSTP network.

Pin Designation Connection Function

1 N2+ TB2-128 Non-inverting Input

2 N2- TB2-129 Inverting Input

3 REF TB2-130 Reference (Grounded at one end only.)

Address SwitchThe Address Switch, SW1, must be set to the MAC address of the MicroTech II BACnet MSTPCommunications Module.

12-Pin HeaderThe 12-pin header, J1, connects the unit controller Main Control Board to the MicroTech II BACnetMSTP Communications Module through the bottom of the communications module.

8 IM704-0

Installation

The MicroTech II BACnet MSTP 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. The BACnet MSTP network connects to the MicroTech II BACnet MSTPCommunications Module at the network connector plug, P1. The BACnet MSTP network cableconnects TB2 in the unit cabinet.

Mounting

Mounting a new MicroTech II BACnet MSTP Communications Moduleon the Main Control BoardYou can add a new MicroTech II BACnet MSTP Communications Module to the system in order toincorporate it into a network. The MicroTech II BACnet MSTP Communications Module is includedin a kit (Part number 090016702) along with a cable harness (Part number 090011182) and thismanual.

To mount a new MicroTech II BACnet MSTP Communications Module on the MicroTech IIMain Control Board1. Remove power from the Main Control Board.2. Remove the network cable plug-in connector terminal block in P1. See Figure 3.3. Locate the empty connector and four standoffs for the MicroTech II BACnet MSTP

Communications Module on the Main Control Board. See Figure 4.4. Orient the communications module printed circuit board so that the side with the components

faces out and connector pins can penetrate the 12-Pin Header on the communications module.5. Push the communications module 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 MSTP Communications Module to the network with wire harness (part

number 0900112-82). See Figure 6.a. Connect the cable harness clear wire (No. 522) to the N2+ terminal of the P1 connector plug

and connect the black wire (No. 523) to the N2– terminal of the P1 connector plug.

Note: You must maintain the polarity of the signal throughout the network. Alwaysconnect + to + and – to –.

b. To prevent ground currents, connect the drain wire at only one end of the network. If youconnect the drain wire at the communications module, connect the drain wire (No. 524) tothe REF terminal of P1 connector plug.

c. Route the cable harness down to the shelf below the main control board and to the left alongthe shelf to the edge. Route the cable through a hole down the cable raceway to TerminalBlock TB2.

d. Connect the cable harness clear wire (No. 522) to terminal 128 of TB2 and connect the blackwire (No. 523) to terminal 129 of TB2.

e. Do Not connect the drain wire (No. 524).

Note: You must maintain the polarity of the signal throughout the network. Alwaysconnect + to + and – to –.

7. Connect the BACnet MSTP network cable to TB 2 terminals 128, 129, and 130.

IM704-0 9

Note: Terminal 130 of TB 2 is provided as a common connection point for the shield of thenetwork cable. The shield must be continuous throughout the entire network cable andmust be connected to earth ground at only one point.

Note: The BACnet MSTP network must be terminated at each end with a 120 ohm resistorbetween the + and - terminals.

8. Set the Media Access Control (MAC) Address in Address Switch SW1. The networkadministrator assigns MAC addresses.

9. Apply power to the MicroTech II Main Control Board.

Replacing a MicroTech II BACnet MSTP Communications Module onthe MicroTech II Main Control BoardTo replace the MicroTech II BACnet MSTP Communications Module on the Main ControlBoard1. Remove power from the Main Control Board.2. Record the MAC Address set in Address Switch SW1.3. Remove the network cable plug in connector terminal block P1. See Figure 3.4. Locate the four standoffs for the MicroTech II BACnet MSTP Communications Module on the

Main Control Board. See Figure 4.5. Use a pliers or screwdriver to depress the barb on one standoff and gently pull the corner of the

communications module over the barb. Be careful to not bend the communications module ormisalign the connector pins.

6. Proceed to the other three corners, remove the communications module from each standoff, andpull the module over the standoffs.

7. Gently lift the MicroTech II BACnet MSTP Communications Module from the Main ControlBoard.

8. Locate the empty connector pins and four standoffs for the MicroTech II BACnet MSTPCommunications Module on the Main Control Board. See Figure 4.

9. Orient the communications module so that the component side faces out and the connector pinscan penetrate the 12-Pin Header on the communications module. See Figure 5.

10. Push the MicroTech II BACnet MSTP Communications Module onto the connector pins andstandoffs until you hear the faint click of the locking standoffs securing the module in place.

11. Connect the communications module to the network. Replace network cable plug in P1. SeeFigure 3.

12. Reconnect the network to TB 2 terminals 128, 129, and 130 if it is necessary.13. Set the Media Access Control (MAC) Address in Address Switch SW1. See Step 2.14. Apply power to the MicroTech II Main Control Board.

10 IM704-0

Figure 4. LonMark Communications Module Main Control Board

Location of Standoff(4 places)

Network Connector Plug

Main Control Board

12-Pin Header

IM704-0 11

Figure 5. Mount BACnet MSTP Communications Module

Address Switch, SW1

Network Connector Plug

Locking Stnadoff(4 Places)

BACnet MSTPCommunications Module12-Pin Header

LED Indicators

Figure 6. BACnet MSTP Connection Schematic Diagram

522

523

524

BACnet MSTPCommunications

Module

MainControlBoard(MCB)

UnitTerminal

BlockTb2

128

129

BACnet MSTP Network

130

N2+

N2-

REF

12 IM704-0

Figure 7. BACnet MSTP Network Cable Routing

BACnet MSTPComunicationsModule

BACnetMSTPCommCard

Controller

Cable Shelf

Cable Raceway

Terminal Block TB2

Network Cable

IM704-0 13

Replacing the MicroTech II BACnet MSTP Communications Module ona MicroTech II Auxiliary Control BoardTo replace a MicroTech II BACnet MSTP Communication Module on a Auxiliary ControlBoard1. Remove power from the Auxiliary Control Board.2. Record the Bus Address set in Address Switch SW1.3. Remove the bus cable plug in connector terminal block P1. See Figure 8.4. Locate the four standoffs for the MicroTech II BACnet MSTP Communications Module on the

Auxiliary Control Board.5. Use a pliers or screwdriver to depress the barb on one standoff and gently pull the corner of the

module over the barb. Be careful to not bend the module or misalign the connector pins.6. Proceed to the other three corners, remove the module from each standoff, and pull the module

from the connector and standoffs.7. Gently lift the MicroTech II BACnet Communications Module from the Auxiliary Control Board.8. Orient the new communications module so that the side with the components faces out and the

connector pins on the Auxiliary Control Board can penetrate the 12-Pin Header on thecommunications module.

9. Push the MicroTech II BACnet MSTP Communications Module onto the connector pins andstandoffs until you hear the faint click of the locking standoffs securing the module in place.

10. Connect the communications module to the bus. Replace the bus cable plug in P1. See Figure 8.11. Set the Bus Address in Address Switch SW1. See Step 2.12. Apply power to the MicroTech II Auxiliary Control Board.

Figure 8. MicroTech II Auxiliary Control Board

Auxilliary ControlBoard

BACnet MSTPCommunications Module

Bus ConnectorPlug P1

MAC Address Switch SW!

14 IM704-0

Integration

Network ConnectionBACnet MSTP Network AddressingThe BACnet MSTP device address (Media Access Control [MAC] address) of the MicroTech IIcontroller in a BACnet Master Slave/Token Passing (MSTP) Local Area Network (LAN) is set in aneight-position DIP switch on the BACnet MSTP Communications Module. The address is physicallyset in binary switches. Bit 0 of the address corresponds to switch position 1 and bit 7 of the addresscorresponds to switch position 8. All MicroTech II controllers must be master controllers; therefore,bit 7 is always equal to 0. An open switch (switch up) is a 0, and a closed switch (switch down) is a 1.This address must be unique and is determined during installation. After you set the address in theswitches, you must cycle power to the controller in order for the new address to take effect.

The receive LED flickers when the module is receiving data from the network, and the transmit LEDflickers when the module is sending data to the network. The default data transmission rate is set to19,200 bps (baud). You can change the data transmission rate to 9600, 38,400, or 76,800 bps. Referto the MicroTech II Protocol Data Information Packet (See Reference Documents).

The default BACnet MSTP network address of the MicroTech II Applied Rooftop Unit Controller is2001. You can change this address. Refer to the MicroTech II Protocol Data Information Packet (SeeReference Documents).

Configuring the Unit ControllerThe MicroTech II BACnet MSTP Communications Module is configured at the factory as a unitcontroller. The unit is ready to operate with the default values of the various parameters set at thefactory. Default values may be changed with the unit’s keypad or via the network. See the appropriateoperation manual for default values and keypad operation instruction and see the appropriateMicroTech II Protocol Information Data for descriptions of the network variables. See ReferenceDocuments for part numbers.

The MSTP Network Address and the MSTP Baud Rate of the MicroTech II unit controller must bethe same as all other BACnet devices on the network for devices to communicate with each other.Also, the Communication Option property of the MicroTech II unit controller device object must beset to MSTP.

IM704-0 15

Service Information

Test ProceduresIf you can control the unit from the unit’s keypad, but you are not able to communicate with unit viathe network:• Verify the network (bus) wiring• Verify the cable harness to the network terminals• Verify that the Transmit LED (DS2) is flickering• Verify that the MSTP MAC address (SW1) is set in the 0-127 range (Master).

If the MicroTech II BACnet MSTP Communications Module still does not respond, replace thecommunications 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 Number.

Kit, MSTP Installation Kit for BACnet MSTP Communications Module 0900167-02

Wire Harness Wire harness for LonMark Communications Modules 0900112A81

13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (612) 553-5330