McQuay IM 689-2 Installation & Maintenance Data

Brand: McQuay

Model: IM 689-2

Category: Networking

Type: Installation & Maintenance Data

Installation & Maintenance Data

IM 689-3

Group:

McQuay Controls

Part Number:

629952Y

Date:

January 2001

MicroTech

BACdrop

™

Gateway

BACnet™-to-MicroTech Communications Gateway

IM 689-3

Contents

Introduction .......................................................................................................................................... 4

General Description

........................................................................................................................ 6

Component Data................................................................................................................................... 6

Single Board Computer ................................................................................................................... 6

Power Supply................................................................................................................................... 7

BACdrop Software ............................................................................................................................... 8

BACdrop Program........................................................................................................................... 8

Point Mapping File (PMF)............................................................................................................... 8

Configuration File............................................................................................................................ 8

Applying the BACdrop Gateway ......................................................................................................... 8

MicroTech Supervisory Controllers and the Level-2 BACdrop ...................................................... 9

Monitor Software and BACdrop.................................................................................................... 10

Installation

....................................................................................................................................... 11

Panel Location and Mounting............................................................................................................. 11

Field Wiring........................................................................................................................................ 12

Power............................................................................................................................................. 13

MicroTech Network Communications........................................................................................... 13

Network Commissioning.................................................................................................................... 15

About the Network Address .......................................................................................................... 16

Preparing an Address Schedule ..................................................................................................... 17

Commissioning Overview ............................................................................................................. 19

Task 1: Configuring the BACdrop Gateway.................................................................................. 19

Task 2: Configuring a Level-1 MicroTech Supervisory Controller ............................................... 20

Task 3: Verifying the Integrity of the Communications Trunk ...................................................... 21

Task 4: Connecting the BACdrop Gateway to the Trunk .............................................................. 22

Task 5: Connecting the Controllers and Verifying Communications............................................. 23

BACdrop Setup Wizard User’s Guide

....................................................................................... 29

System Requirements ......................................................................................................................... 29

Installing the BACdrop Setup Wizard................................................................................................ 30

Starting the BACdrop Setup Wizard .................................................................................................. 30

Working With the BACdrop Gateway................................................................................................ 31

System Information Tool ............................................................................................................... 32

Configure Controller List Tool ...................................................................................................... 33

Configure Network Numbers Tool ................................................................................................ 35

Download Tool .............................................................................................................................. 36

Write Configuration to File (Backup) Tool.................................................................................... 36

Read Configuration From File (Restore) Tool............................................................................... 36

Change Timing Parameters Tool (Advanced Users Only)............................................................. 37

Working With the MicroTech Network Through the BACdrop Gateway .......................................... 37

BACnet Network Diagnostic Tool................................................................................................. 39

Network Read/Write Tool.............................................................................................................. 40

Working With MicroTech Controllers................................................................................................ 41

MicroTech Controller Configure Tool........................................................................................... 42

Working With the MicroTech Network Through an RS-232 to RS-485 Converter............................ 43

MicroTech Network Diagnostic Tool ............................................................................................ 44

IM 689-3

Service Information

....................................................................................................................... 45

Wiring Diagram .................................................................................................................................. 45

Testing Guidelines .............................................................................................................................. 45

Troubleshooting Power Problems .................................................................................................. 45

Troubleshooting Network Communications Problems .................................................................. 46

Troubleshooting the SBC............................................................................................................... 47

Jumper Settings................................................................................................................................... 47

Ethernet Status LEDs.......................................................................................................................... 50

Parts List............................................................................................................................................. 50

McQuay, AAF, and MicroTech are registered trademarks of McQuay International.

BACdrop, Monitor, and Open Protocol are trademarks of McQuay International.

All other trademarks are the property of their respective owners.

IM 689-3

Introduction

The MicroTech® BACdrop™ gateway integrates a MicroTech network into a BACnet™ building

automation system (BAS) so that you can monitor and control McQuay International equipment from

the BAS. The gateway translates between BACnet objects on an Ethernet® network and McQuay

memory locations on a proprietary MicroTech network.

Each BACdrop gateway can support up to 63 MicroTech controllers. No modifications to MicroTech

hardware or software are necessary. Most standard MicroTech unit and supervisory control

applications are supported (see Table 1).

This manual describes BACdrop components, field-wiring requirements, commissioning procedures,

and service procedures. Point mapping information for standard MicroTech control applications is

provided in a separate series of BACnet Data Information Packet (BDIP) documents. In addition to

point mapping data, the BDIP documents include references to MicroTech unit controller installation

and operation literature that may be needed to engineer a BAS application. Two BACnet Protocol

Implementation Conformance Statement (PICS) documents are also available. See Table 1 below.

All BACdrop-related literature is available to the public through the McQuay International bulletin

board system called McQuay OnLine. The latest BACdrop software updates are also made available

(at no charge) through McQuay OnLine. For access to McQuay OnLine, contact the McQuay

Controls group in Minneapolis.

Table 1. Related BACdrop Literature

Description

Document

BDIP for MicroTech air-cooled screw chiller applications (type ALS) BD 01

BDIP for MicroTech water cooled screw chiller applications (types WHS, PFS-B, PFS-C) BD 02

BDIP for MicroTech scroll chiller applications (type AGZ) BD 03

BDIP for MicroTech large-tonnage water cooled screw chiller applications (type PES with J&E Hall

compressor)

BD 04

BDIP for MicroTech series-100 centrifugal chiller applications; includes MicroTech Lead-Lag/Load

Balance (LLLB) controller

BD 05

BDIP for MicroTech series-200 centrifugal chiller applications BD 06

BDIP for MicroTech reciprocating chiller applications (U.S. models only) BD 07

BDIP for MicroTech self-contained air conditioning applications BD 08

BDIP for MicroTech applied rooftop system applications BD 09

BDIP for MicroTech unit ventilator applications BD 10

BDIP for MicroTech Remote Monitoring and Sequencing Panel (RMS) BD 11

BDIP for MicroTech Remote Monitoring and Control Panel (RMC) BD 12

BDIP for MicroTech Chiller System Controller Panel (CSC) BD 13

PICS for BACdrop gateway PICS-BAC

PICS for MicroTech virtual BACnet controllers PICS-MT

WARNING

Electric shock hazard. Can cause personal injury or equipment damage.

This equipment must be properly grounded. Connections and service to the MicroTech control

panel must be performed only by personnel that 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.

IM 689-3

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.

IM 689-3

General Description

The BACdrop gateway is an embedded-PC controller that translates between the standard BACnet

protocol (ANSI/ASHRAE Standard 135-1995) and the proprietary MicroTech protocol. It makes

controllers on a MicroTech network appear as BACnet nodes offering BACnet services so that

application-level data communication between the two networks is possible. The physical layer of the

BACnet side of the gateway must be ISO 8802-3 (Ethernet), 10BaseT. The MicroTech side appears

as BACnet riding on ISO 8802-3.

The BACdrop gateway is a passive device. It receives, translates, and re-transmits messages

including both data and control signals from one network to the other network in either direction. It

does not perform any supervisory control for the various MicroTech controllers connected to it. After

a BACdrop gateway is set up, no further adjustments are usually necessary unless you change the

network configuration.

Using the BACdrop gateway as an interface, the BACnet BAS is able to perform the following

supervisory functions for MicroTech unit and auxiliary controllers:

•

Set the operating mode

•

Monitor most controller inputs, outputs, setpoints, parameters, and alarms

•

Set most controller setpoints and parameters

•

Clear alarms

For details on available MicroTech controller parameters and capabilities, refer to the BDIP

documentation (see Table 1) and consult with a representative of the BAS company. For details on

specific BACnet features (services, objects, character sets, etc.) that BACdrop supports, refer to the

two BACnet Protocol Implementation Conformance Statements (see Table 1).

Component Data

Figure 1 shows the physical layout of the BACdrop panel. The major components of the gateway are

a single board computer (SBC), which includes an onboard 10BaseT Ethernet port, and a power

supply (PS) with a circuit breaker (CB). The circuit breaker can be used as an on-off switch for the

panel.

Single Board Computer

The single board computer (SBC) is an embedded PC that contains a 386SX, 33 MHz microprocessor

and 4 Mb of RAM. It is programmed to receive, translate, and re-transmit data and control signals

across the BACdrop gateway in either direction. The SBC’s operating system is ROM-DOS, which is

an MS-DOS 6.22 compatible ROM-based operating system for embedded PCs. Instead of a hard

disk, the SBC uses a 512 kb flash memory chip to store its programs and data files.

The SBC has an integrated NE2000 Ethernet controller that serves as the interface between the

BACdrop gateway and a Local Area Network (LAN) or BAS. The Ethernet controller has four status

LEDs. See the “Service Information” portion of this manual for more information on their locations

and indications.

Communication Ports

The BACdrop gateway has three communication ports, which are labeled “Ethernet,” “Network,” and

“PC.” These are all connected to communications ports on the SBC via internal factory wiring.

Ethernet Port:

The “Ethernet” port provides a connection to an Ethernet network conforming to the

ISO 8802-3, 10BaseT standard. The field connection point is an RJ-45 receptacle on the side of the

panel.

IM 689-3

Network Port:

The “Network” port provides an RS-485 connection to the MicroTech network. The

communications rate is 9600 bps. The field connection point is a 3-post terminal strip on the side of

the panel.

PC Port:

The “PC” port provides an RS-232C connection point for a PC. The communications rate

is 9600 bps. The field connection point is a standard DB9 female receptacle on the side of the panel.

To connect the BACdrop gateway to the PC, use a standard serial cable (not a null modem cable).

Figure 1. Control Panel Layout

SBC

J1 connector

RJ-45

J22

GRD

“Ethernet” port

“Network” port

“PC” port

Flash memory chip

Ethernet status LEDs

Speaker

5 Vdc power in

Power Supply

The BACdrop gateway’s power supply (PS) requires a 100 – 240 Vac, 50/60 Hz power source. The

power supply furnishes 5 Vdc power to the SBC.

IM 689-3

BACdrop Software

The BACdrop gateway contains three files that allow it to perform its data translation functions:

•

BACdrop program

•

Point mapping file (PMF)

•

Configuration file

The BACdrop program and the point mapping file are downloaded into each BACdrop gateway at the

factory. New versions of either file can easily be downloaded in the field using a PC that contains the

BACdrop Setup Wizard software. New releases of BACdrop software will be made available (at no

charge) on the McQuay International bulletin board system called McQuay OnLine. For access to

McQuay OnLine, contact the McQuay Controls group in Minneapolis.

BACdrop Program

The BACdrop program is automatically loaded when the SBC boots. The program is contained in a

single executable file. The naming convention for the BACdrop file is, for example, BDRPv157.exe.

The “v157” indicates version 1.57.

Point Mapping File (PMF)

The PMF includes specific point mapping information for MicroTech control applications. For each

point in the PMF, a proprietary memory location for a MicroTech control application is associated

with a BACnet object type, object name, and instance number. Conversion factors and other data

such as engineering units and binary state labels are also included.

The standard PMF contains all currently supported standard MicroTech control applications. See

Table 1 for a listing. The naming convention for the standard PMF is, for example, PMFv107.tab.

The “v107” indicates version 1.07. Thirteen BACnet Data Information Packet (BDIP) documents

describe the various portions of the standard PMF. See Table 1.

Custom PMF files and BDIPs can be written for custom MicroTech control applications. Contact

your McQuay representative for a quotation.

Compatibility

The PMF file associates BACnet objects with specific memory locations within the MicroTech

controllers. These memory locations are defined by the MicroTech application software within the

controllers, and thus compatibility between the PMF file and the MicroTech application software

(identified by its IDENT code) must be maintained.

The BACdrop gateway is not able to check for software compatibility. It is the responsibility of the

installer (typically a representative of McQuay International) to assure software compatibility using

the information provided in the BDIP documents. See the appropriate BDIP for more information.

Configuration File

The configuration file contains data that is specific to the network the BACdrop gateway is part of.

The file is created by the BACdrop Setup Wizard during the commissioning process. It includes

information about the number, types, and addresses of the MicroTech controllers. After the

configuration file is created in the BACdrop gateway, it can be uploaded to a PC for backup. If the

SBC or its flash memory chip should ever require replacement, the backup configuration file can be

downloaded (restored) to the BACdrop gateway with the Setup Wizard.

Applying the BACdrop Gateway

The BACdrop gateway is required whenever one or more MicroTech controllers must be integrated

into a BACnet network. Each BACdrop gateway provides a single-point connection for up to 63

MicroTech controllers. See Figures 2 and 3 below.

IM 689-3

The following standard MicroTech applications are supported in the current version of the PMF file:

•

Air-cooled screw chiller (type ALS)

•

Water-cooled screw chiller (types WHS, PFS-B, PFS-C)

•

Air-cooled scroll chiller (type AGZ)

•

Large-tonnage water cooled screw chiller with J&E Hall compressor (type PES)

•

Series-100 centrifugal chiller (old-style MicroTech controls)

•

Series-200 centrifugal chiller

•

Reciprocating chiller (only U.S. manufactured at present)

•

Self-contained air conditioning systems

•

Applied rooftop systems

•

Unit ventilator

•

MicroTech Lead-Lag/Load Balance Panel (LLLB)—supervisory controller

•

MicroTech Remote Monitoring and Sequencing Panel (RMS)—supervisory controller

•

MicroTech Remote Monitoring and Control Panel (RMC)—supervisory controller

•

MicroTech Chiller System Controller (CSC)—supervisory controller

MicroTech Supervisory Controllers and the Level-2 BACdrop

When a MicroTech supervisory control panel is used (CSC, RMS, RMC, or LLLB), data

transmission speed will be affected. The reason for this is related to the nature of the MicroTech

master-slave network topology.

See figures below. When a MicroTech supervisory controller is not used, the BACdrop gateway is in

the level-1 master position in the MicroTech network. This allows it to obtain data from its level-2

slave controllers in the most efficient way possible. When a MicroTech supervisory controller is used,

it must occupy the level-1 master position, forcing the BACdrop panel to a level-2 slave position.

This means that the level-1 controller (e.g., CSC) must poll the BACdrop for all requests it has of

other controllers (e.g., chiller temperatures) on the network. Because the level-2 BACdrop must wait

to be polled, a delay is introduced that will ultimately affect the responsiveness at the BAS PC. This

delay is minimal—on the order of 1 second per screen of data.

For most applications, a MicroTech supervisory controller is optional. When properly programmed

and installed, a BAS can usually perform the same supervisory control functions that the MicroTech

supervisory controllers perform. One important exception is for the case of a dual-compressor

centrifugal chiller with series-100 (old style) MicroTech controls. For this type of chiller, a

MicroTech supervisory controller—either LLLB or CPC—is required to coordinate compressor

operation.

Figure 2. Typical BACdrop Application (Level-1 BACdrop)

RTU UV

Up to 63 MicroTech

controllers per BACdrop

BACnet on ISO 8802-3 (Ethernet), 10BaseT

MicroTech

BACdrop

(level 1)

Chiller UV UV UVSCU

Level 2

MicroTech

Level 1

BACnet BAS

by others

Main "front end"

PC for BAS

MicroTech network (RS-485)

IM 689-3

Figure 3. BACdrop Application with a MicroTech Supervisory Controller (Level-2 BACdrop)

Chiller

Level 2

MicroTech

Up to 63 MicroTech

controllers per BACdrop

BACnet BAS

by others

BACnet on ISO 8802-3 (Ethernet), 10BaseT

MicroTech

BACdrop

(level 2)

Level 1

ChillerChiller

Main "front end"

PC for BAS

CSC

Chiller

MicroTech network (RS-485)

All data requests from BACnet BAS to

MicroTech level-2 controllers are routed

through level-1 MicroTech controller

Monitor Software and BACdrop

In general, MicroTech Monitor™ software should not be used in a BACdrop network—except

perhaps for temporary troubleshooting purposes. A PC containing Monitor software can be directly

connected to port A (TTY) of any MicroTech controller for access to that controller only. (The

BACdrop Setup Wizard is also capable of this, although its capabilities are more limited.) In a

BACnet BAS that is integrated with a MicroTech network via BACdrop, the user interface software

for the main “front end” PC should always be provided by the systems integration company.

When the BACdrop gateway is level 1 (see Figure 2 above), communications between the PC

containing Monitor software and other MicroTech controllers on the network is physically

impossible. Only the MicroTech controller that the PC is directly connected to can be communicated

with. This excludes the BACdrop gateway itself—Monitor software cannot be used to communicate

with the BACdrop gateway by any means. (The BACdrop Setup Wizard allows this.)

When the BACdrop is level 2 (see Figure 3 above), communications between the PC containing

Monitor software and other MicroTech controllers on the network is possible, but it will severely

affect the data transmission rates through the BACdrop gateway. We do not recommend such an

application.

IM 689-3

Installation

Panel Location and Mounting

The BACdrop gateway is suitable for indoor use only. Table 2 lists the allowable temperature and

humidity ranges. Locate the panel at a convenient height, and allow adequate clearance for the door

swing. Mount the panel to the wall with screws or bolts. It weighs approximately 10 pounds (4.5 kg).

Four 5/16-inch (7.9 mm) openings are provided at the corners of the panel. Panel dimensions are

shown in Figure 4.

Table 2. BACdrop Gateway Environmental Specifications

Panel state

Temperature

Relative humidity

Operating 32 – 140°F (0 – 60°C) 20 – 90%, noncondensing

In storage 0 – 158°F (-18 – 70°C) 20 – 90%, noncondensing

Figure 4. BACdrop Panel Dimensions

Note:

Values in parentheses

are in millimeters.

Front ViewSide View

Hinge

1.44"

(37)

0.88" (22)

Bottom View

9.44"

(240)

10BaseT Ethernet

port (RJ-45),

external right side

MicroTech network

field terminal block,

external right side

Serial port (DB9),

external right side

10.75"

(273)

6.00"

(152)

11.31"

(287)

11.63"

(295)

1.44"

(37)

0.53" (13)

1.95"

(50)

4.25"

(108)

1.95"

(50)

1.56"

(40)

Top View

4x 0.88 dia. (22)

IM 689-3

Field Wiring

Following are descriptions of the various field wiring requirements. A typical field wiring diagram is

shown in Figure 5. Wiring must comply with the National Electrical Code and all local codes and

ordinances. The warranty is void if wiring is not in accordance with these instructions.

The panel is divided into high and low voltage sections by a sheet metal barrier. The power wiring

should enter the high voltage section through one of the 7/8-inch (22 mm) openings. External

receptacles and a terminal block are provided for the low-voltage communications wiring.

Figure 5. Typical Field Wiring Schematic for MicroTech Network

TS2

BACdrop

Hot

Neutral

100 – 240 Vac

Power

GRD

Notes:

1. Twisted, shielded pair cable must meet the following

minimum requirements: 300 V, 60°C, 20 AWG, polyethylene

insulated, with a PVC outer jacket and drain wire (Belden

8762 or equivalent). Some local codes may require the use

of plenum rated cable.

2. 10BaseT Ethernet cable. To directly connect a PC to the

Ethernet port, a hub or a special crossover cable must be

used.

3. Cable length must not exceed 5000 ft (1524 m).

4. Standard serial cable. A null modem is not required.

See notes 1 & 3

Self-contained AC

Port B

GND

TB7

Reciprocating

chiller

Port B

139

TB4

Screw chiller

Port B

BLK

WHT

B+

B–

138

137

Comm B

UVC (325)

PNK

GRY

Comm B

UVC (125)

PNK

GRY

RJ-45

3rd-party BAS

See note 2

TB1

Centrifugal chiller

(series 200)

Port B

TB2

Applied rooftop

Port B

130

128

129

Legend

Field wiring terminal

Field wiring: discrete

Factory wiring

Field wiring: twisted, shielded pair cable

with drain wire

(see note 1)

B+

Crimp or solder splice

BLK

WHT

BLK

WHT

BLK

WHT

BLK

WHT

BLK

WHT

BLK

WHT

BLK

WHT

BLK

WHT

BLK

WHT

Comm B

UVC (325)

PNK

GRY

Comm B

UVC (325)

PNK

GRY

Comm B

UVC (325)

PNK

GRY

Ethernet

DB9

–

GRD

Network

See note 4

Field wiring: 10BaseT Ethernet

Standard serial cable

IM 689-3

Power

WARNING

Electric shock hazard. Can cause personal injury or death.

This equipment must be properly grounded.

All protective deadfront panels must be reinstalled and secured when power wiring is complete.

The BACdrop gateway requires a 100 – 240 Vac, 50/60 Hz power supply. The panel must be properly

grounded by connecting the ground terminal (GRD) to earth ground. Refer to Figure 5. Power wiring

must be sized to carry at least 2 A.

To gain access to the high voltage section, remove the screws that secure the deadfront cover to the

panel. Replace this deadfront when the wiring is complete.

The panel is protected by a 2 A circuit breaker (CB), which is located inside the panel above the

deadfront barrier (see Figure 1). This push-button circuit breaker can be used as an on-off switch for

the panel. A white ring on the switch shaft is visible when the power is off.

MicroTech Network Communications

For MicroTech network communications to occur, a twisted, shielded pair cable must be connected

between the BACdrop gateway and its associated MicroTech unit or supervisory controllers. This

interconnecting, “daisy-chain” wiring is shown in Figure 5. Network communications is

accomplished using the RS-485 interface standard at 9600 baud.

For a typical BACdrop network, the BACdrop gateway is the level-1 controller and the unit

controllers are level-2 controllers. There are no level-3 controllers—except in the case of series-100

(old style) centrifugal chillers, which have a level-2 display processor and a level-3 unit control

processor.

About MicroTech Network Architecture

All controllers in a MicroTech network are assigned a level: level 1, level 2, or level 3. All

networks must have one level-1 controller to coordinate communications. Multiple level-2

controllers connect to the level-1 controller with a communications trunk. A trunk is defined

as an isolated section of the daisy-chained network wiring. In Figure 5, the network wiring

between all controllers is a trunk. Multiple level-3 controllers can be connected to a level-2

controller with a separate trunk; however, this is typically not done in BACdrop

applications. The maximum allowable length of a communications trunk is 5000 ft (1524 m).

Cable Specification

The MicroTech network communications cable must meet the following minimum requirements:

twisted, shielded pair with drain wire, 300 V, 60°C, 20 AWG, polyethylene insulated, with a PVC

outer jacket (Belden 8762 or equivalent). Some local codes or applications may require the use of

plenum rated cable. Do not install the cable in the same conduit with power wiring.

Note:

Ideally, one continuous piece of cable should connect any two controllers. This will reduce the

risk of communications errors. If the cable must be spliced, use crimp-type butt connectors (better) or

solder (best). Do not use wire nuts.

IM 689-3

Wiring Instructions

Most MicroTech unit and supervisory controllers are equipped with field terminals for the network

communications terminations. Internal factory wiring connects the field terminals to the MCB’s

network communications port. On a level-2 communications trunk, all MicroTech controllers (either

level 1 or 2) are connected via communications port B. After the field wiring terminations are

complete, a MicroTech controller can be easily disconnected from the network by unplugging its port

B connector. See Figure 5.

On the BACdrop gateway, the field wiring terminals are on the “Network” terminal block. For

MicroTech unit and supervisory controllers, refer to the unit wiring diagrams or product-specific

installation manuals to find the correct field wiring terminals.

Unit designations are established by the network address, not the physical position of the unit in the

daisy chain. Thus the networked controllers can be wired in any order. However, it is highly

recommended that the installing contractor keep track of the physical order of the controllers on the

daisy-chained trunk by preparing a schedule or drawing. This will facilitate troubleshooting any

network communications problems that may occur. For more on the network address, see “About the

Network Address” in the “Network Commissioning” section.

To perform the network wiring

1. Before beginning, verify that the port B plug is disconnected from every MicroTech controller

(MCB) on the communications trunk being wired. These plugs will be connected during the

commissioning procedure. This is a precaution to prevent stray high voltage from damaging the

controllers. Any voltage more than 12 V can damage the board’s communications hardware.

The BACdrop gateway does not have a B port that can be easily disconnected, so do not connect

the network wiring on the BACdrop yet. The final connections will be made during the

commissioning procedure.

2. Connect the network cable in a daisy-chain manner as shown in Figure 5. Do not connect the

BACdrop gateway yet. Observe the following guidelines:



Use care to assure that the correct polarity is maintained at each controller.



Be sure to connect the cable shield to each controller as shown in the illustration. Like the

positive (+) and negative (–) conductors, the shield (ground) conductor must be continuous

over the trunk.



Use care to assure that no shorts or opens exist in the network.



Figure 5 shows the BACdrop gateway at the end of the daisy chain; however, this is not

required. The BACdrop gateway can be located anywhere in the trunk.



Record the physical positions of the cable runs and the controllers on a floor plan. This will

make it easier to troubleshoot any network communications problems that may occur during

installation or in the future.



When making wire splices and multiple-wire terminations, always match wire color to

reduce the risk of shorts.

Note:

Refer to the unit wiring diagrams or product-specific installation manuals to find the

correct field wiring connections.

IM 689-3

Network Commissioning

NOTICE

This section discusses the commissioning of a MicroTech network. Only personnel trained in

MicroTech network commissioning procedures are allowed to commission a network. (This

section is for review and guidance.) Network commissioning training classes are held periodically

at McQuay International’s Minneapolis location. Contact the McQuay Controls group for more

information on network commissioning training classes and dates.

Unless special arrangements have been made, commissioning the MicroTech side of a BACdrop

network (i.e., the McQuay equipment including the BACdrop gateway and all MicroTech unit and

supervisory controllers) is the responsibility of the McQuay International sales representative, not

the BAS company.

The purpose of network commissioning is to establish and verify communications between the

BACdrop gateway and its networked MicroTech unit or supervisory controllers. (It is not to establish

and verify unit operation.) Any controller configuration that is necessary to establish network

communications will be discussed in this section. Controller configuration that is required for control

application set up will not be discussed here. That sort of information can be found in the BDIPs and

the MicroTech controller operation manuals.

Network commissioning can be done independently of the unit commissioning procedures; however,

if it is done before the units are commissioned, care should be taken to assure that the units do not

start. Before any unit is allowed to operate, it must be commissioned in accordance with the

instructions in the MicroTech unit controller installation literature and the model-specific unit

installation literature.

Required and Recommended Tools

To commission the network, you need the following tools:

1. Voltmeter

2. Ohmmeter

3. PC (Windows 95/98) equipped with Ethernet card and BACdrop Setup Wizard software (see

note below)

The BACdrop Setup Wizard is included on a set of diskettes that is shipped with the BACdrop

gateway. It is also available on the McQuay OnLine bulletin board system.

4. 10BaseT Ethernet crossover cable (or two standard 10BaseT Ethernet cables and hub) to connect

the PC to the BACdrop’s “Ethernet” port (see note below)

5. Standard serial cable to connect the PC to the BACdrop’s “PC” port (DB9)

These additional tools are recommended:

1. MicroTech PC Communications Cable Kit

A MicroTech PC communications cable may be required to troubleshoot MicroTech controllers

that do not communicate. The cable allows the commissioning PC to be directly connected to a

MicroTech controller. This special cable is available as a kit from McQuay International. The

part number is 057186802.

2. RS-232 to RS-485 converter

An RS-232 to RS-485 converter may be required to troubleshoot MicroTech network

communications problems. The converter allows the commissioning PC to be directly connected

to the MicroTech network, bypassing the BACdrop gateway. The BACdrop Setup Wizard can

then be used to verify communications to each MicroTech controller. An RS-232

to RS-485 converter can be obtained through most electronics supply houses such as B&B

Electronics or Black Box. We recommend B&B model 485PTBR. B&B can be reached at

815-433-5100.

IM 689-3

3. Set of hand-held radios or other two-way personal communications equipment

For large networks, it is best if two people work together during the network commissioning

process. A set of radios makes this task much easier and more efficient.

Note:

We strongly recommend using a PC that has an Ethernet adapter to commission a BACdrop

network. This allows the technician to prove and demonstrate network communications through the

same port that the third-party BAS will use. We also recognize that many older laptop PCs do not

have a PCMCIA port so that an Ethernet adapter cannot be installed. If your PC is not capable of

Ethernet communications, the MicroTech network can be commissioned using an RS-232 to RS-485

converter instead (see above). The disadvantage of this approach is that communications through the

BACdrop gateway cannot be proved because the gateway is bypassed.

About the Network Address

For MicroTech network communications to occur, each controller in the network must have a unique

network address. The network address has two parts: L2 address and L3 address. Each part is a two-

digit hexadecimal number. For example, a unit at address “01.0F” has an L2 address of 01 and an L3

address of 0F (decimal 15). The first digit in each part is called the HI digit, and the second digit is

called the LO digit. Thus for the L3 address 0F, the HI digit is “0” and the LO digit is “F.” Table 4 is

a hexadecimal to decimal conversion guide.

Figure 6. MicroTech Network Address

01.0F

L2 HI digit

L2 LO digit

L3 HI digit

L3 LO digit

With the exception of the BACdrop gateway (see below), a MicroTech controller’s address is

determined by its hex switch setting and its level in the network. Table 3 shows how the network

address is defined. Figure 7 shows the HI and LO hex switches.

Table 3. MicroTech Network Address Definition

When the controller is

The L2 address is

The L3 address is

Level 1 Always 00 Always 00

Level 2 The hex switch setting Always 00

Level 3 Read from its level-2 master at power-up The hex switch setting

Figure 7. MicroTech Controller Hex Switches

HI (left) hex switch LO (right) hex switch

After changing a hex switch setting, power to the MCB must be cycled to set the new address into

memory. In MicroTech supervisory panels, you can do this by opening and then closing circuit

breaker CB. In the unit controllers, this can be done in a variety of ways. Refer to the individual

installation manuals for more information on cycling power to the unit controller MCBs.

Note:

If any equipment is running, shut it down before removing power from the unit controller.

Follow the shutdown procedures in the unit controller installation and operation manuals.

IM 689-3

BACdrop Network Address

Unlike other MicroTech controllers, the BACdrop gateway has no hex switches. Instead, it uses a

software address that can be set with the BACdrop Setup Wizard. In most cases, the BACdrop

gateway will be the level-1 controller and thus its network address will be 00.00, which is the default

setting.

Table 4. Hexadecimal to Decimal Conversion Guide

Hex

Dec

Hex

Dec

Hex

Dec

Hex

Dec

000 1016 2032 3048

011 1117 2133 3149

022 1218 2234 3250

033 1319 2335 3351

044 1420 2436 3452

055 1521 2537 3553

066 1622 2638 3654

077 1723 2739 3755

088 1824 2840 3856

099 1925 2941 3957

0A 10 1A 26 2A 42 3A 58

0B 11 1B 27 2B 43 3B 59

0C 12 1C 28 2C 44 3C 60

0D 13 1D 29 2D 45 3D 61

0E 14 1E 30 2E 46 3E 62

0F 15 1F 31 2F 47 3F 63

Preparing an Address Schedule

It is important that an address schedule be prepared before the network is commissioned. The

schedule will be used to set the MicroTech controller addresses and to configure the BACdrop

gateway. (These tasks are discussed in the commissioning procedures below.) The address schedule

should associate the MicroTech network address, unit type, unit tag and/or location, IDENT, and

Device instance for each MicroTech controller. In addition, each schedule should list the MicroTech

Network Number and the version number of the BACdrop’s point mapping file (PMF).

An example of a possible address schedule is shown in Figure 8. Elements of the schedule are

discussed below. A blank address schedule, which may be photocopied, is included as the last page of

this manual.

Assigning MicroTech Addresses

Since a BACnet BAS does not use the MicroTech network address for communications, the McQuay

representative can assign MicroTech network addresses without consulting with the BAS

representative in advance.

The McQuay representative should keep in mind the following rules when assigning MicroTech

network addresses:

•

The level-1 controller (usually a BACdrop gateway) always has a network address of 00.00.

•

If a MicroTech supervisory controller is to be used (RMS, RMC, CSC, or LLLB), it must be the

level-1 controller, forcing the BACdrop gateway to level 2. In most cases, the network address of

a level-2 BACdrop should be 01.00. For a LLLB application, the BACdrop network address

should be 03.00.

•

The L2 addresses of level-2 MicroTech controllers must start at 01 and continue consecutively

(in hex) up to 3F (decimal 63). If there are more than 63 MicroTech controllers, one or more

additional BACdrop gateways are required.

•

There must be no gaps in the address sequences and no duplicate settings.

IM 689-3

•

For a series-100 centrifugal chiller, the level-2 display processor does not have a BACnet point

map, but it still needs a valid L2 address. The BACnet point map is for the level-3 control

processor, which must always have an L3 address of 01. See example below in Figure 8.

As long as these rules are followed, a MicroTech controller’s network address can be set to any value.

Figure 8. Example of an Address Schedule

MicroTech Network No.:

100

PMF Version No.:

1.07

MicroTech

Addr.

Unit

Tag

Unit Type/Description

Compatible

IDENTs

Device

Instance

Location

00.00 BDG-1 BACdrop gateway – 10000 Mechanical room

01.00 RTU-1 VAV rooftop ART1E06B–D 10001 Office area

02.00 RTU-2 CAV rooftop ART5E07A–D 10002 Gymnasium

03.00 CH-1 Centrifugal chiller (series-100,

display processor) — No BACnet

point map available

–––

03.01 CH-1

Centrifugal chiller (series-100,

control processor)

PC408I 10003 Mechanical room

04.00 10004

05.00 10005

06.00 10006

07.00 10007

08.00 10008

09.00 10009

0A.00 10010

0B.00 10011

About the Device Instance and MicroTech Network Number

The Device object instance and the MicroTech network numbers are BACnet codes used by the BAS

to identify individual MicroTech controllers—the BACnet equivalent of the MicroTech network

address. They must be unique throughout the entire BACnet BAS. The numbers are stored in the

BACdrop gateway’s configuration file.

Since the BAS will be using the Device instance and MicroTech network numbers, it is a good idea to

contact the BAS representative prior to configuring the BACdrop gateway to find out whether they

have any special requirements for these numbers. If they do, their preferred numbers can be recorded

in the schedule. If they do not, the Setup Wizard’s default numbers can be recorded in the schedule

and given to the BAS representative. (As shown in Figure 8, the default MicroTech network number

is 100, and the default Device object instances start at 10000 and continue consecutively to 10063.)

Either way, these numbers must be entered into the BACdrop gateway when it is configured. If the

default numbers are used, data entry will be reduced since the Setup Wizard automatically generates

the numbers.

About the Location

The Location column provides a place to list an optional location label that can later be entered into

the BACdrop gateway during configuration. If this is done, the label will be available to the BAS as

the Location property for each BACnet Device object.

About the PMF Version and Compatible IDENTs

An IDENT is the software ID code for MicroTech controller software. The PMF maps specific

memory locations that are defined in the MicroTech controller software and thus it is essential that

compatibility be maintained between the PMF and IDENT versions. The various BDIP documents

provide this compatibility information.

It is highly recommended that the McQuay representative enter the PMF version and its compatible

IDENTs into the schedule in advance so that the actual controller IDENTs (read out of each

controller’s memory) can be checked against these during the commissioning process. Use the BDIP

IM 689-3

documents to fill in the Compatible IDENTs column. For example, document BD 09-7 shows that

rooftop software codes with IDENTs ART1E06B through ART1E06D are compatible with PMF 1.07

(see Figure 8).

It is also recommended that the McQuay representative contact the BAS representative prior to

commissioning the BACdrop network to make sure that BAS engineering personnel will be using

BDIPs for the same PMF version that is on the schedule and which will be used in the BACdrop

gateway.

Projects With Two or More BACdrop Gateways

If a project has two or more BACdrop gateways, the MicroTech networks associated with them

should be separate and independent. The BAS will then have separate connections for each BACdrop

gateway. Each MicroTech network must follow the addressing rules given above in “Assigning

MicroTech Addresses.” Since the Device object instance and MicroTech network numbers must be

unique throughout the BAS, the Setup Wizard’s default values for these can be used on only one

MicroTech network.

Commissioning Overview

Commissioning a MicroTech network that includes a BACdrop gateway is a process that includes

four or five main tasks:

1. Configure the BACdrop gateway

2. Configure the level-1 MicroTech supervisory controller, if present

3. Verify the integrity of the communications trunk

4. Connect the BACdrop gateway to the trunk

5. Connect each MicroTech controller to the trunk and check for communications

Task 1: Configuring the BACdrop Gateway

The first task in commissioning a BACdrop network is to configure the gateway with the BACdrop

Setup Wizard. Configuration essentially involves entering the prepared address schedule into the

SBC’s memory. This allows the BACdrop gateway to properly translate and route data for every

mapped controller on the MicroTech network.

For most applications, all MicroTech controllers should be entered into the BACdrop configuration

file. The level-2 display processor in the series-100 centrifugal chiller is a notable exception. This

MicroTech controller does not have a point map in the PMF since it contains no data or command

points that would be useful to a BAS. Other exceptions may arise; for example, when a customer

does not need BAS access to a particular MicroTech controller.

To configure the BACdrop gateway

1. Connect the PC to the BACdrop gateway with the serial cable.

2. Start the BACdrop Setup Wizard.

For complete reference information on the wizard, including software installation instructions,

see the “BACdrop Setup Wizard User’s Guide” portion of this manual.

3. Select Configure on the BACdrop Panel menu. Then click Modify Controller List on the

submenu.

The Configure Controller List tool starts and its first screen appears. If you are sure that the serial

cable is connected, click the Next button. The second screen appears.

4. Select the COM port you are using and click Next.

The BACdrop Setup Wizard reads the configuration data out of the gateway. The third Configure

Controller List screen appears. By default, the BACdrop gateway is listed as the controller at

address 00.00. The special 00.00 address assignment defines the BACdrop as the level-1 device.

IM 689-3

If the BACdrop gateway is to be a level-2 device, you should change its address now. Click the

Modify button and enter the new MicroTech address. Click Done when finished. By changing

the BACdrop gateway’s address to a level-2 format (e.g., 01.00), you define the BACdrop as a

level-2 device.

5. Compare the PMF version in the BACdrop gateway with the PMF version listed on your

prepared address schedule. The BACdrop’s PMF version is shown on the main Configure

Controller List screen; e.g., “BACdrop with PMF version 1.07.”

The PMF versions must match to assure software compatibility between the BACdrop gateway

and its MicroTech controllers.

If the BACdrop’s PMF version is earlier than the one listed in the schedule, you should obtain

the later PMF and download it to the BACdrop gateway. You can use the BACdrop Setup Wizard

and a serial cable to do this.

If the BACdrop’s PMF version is later than the one listed in the schedule, you should obtain the

latest versions of the BDIPs for the MicroTech applications being used. Then double check the

software compatibility tables and update the schedule if necessary.

If you have not already done so, you should contact the BAS representative and make sure that

the BAS user interface and supervisory control applications are being designed around the same

or equivalent PMF versions.

6. Click the Add button.

The wizard allows you to define a new MicroTech controller. Enter the MicroTech address, the

Device type, the Device instance, and if desired, the Location. Click Done when finished.

The Device type entries start by listing the first part of the IDENT (the version and revision

codes are not included). This is intended to help you quickly find the correct MicroTech

controller type. It cannot be used to check PMF-IDENT software compatibility.

Any of this configuration data can be modified later by selecting the device and then clicking the

Modify button.

7. Repeat step 6 until the address schedule is completely entered. (But do not add controllers that

will not be mapped; e.g., a series-100 centrifugal chiller’s level-2 display processor.)

To make data entry easier, the wizard automatically increments the MicroTech address and the

default Device instance number after any controller is added.

8. Click the Finish button when the configuration is complete.

The configuration data is written to the BACdrop gateway’s non-volatile memory. This step is

very important because up until this point, all configuration data that has been entered exists only

in the PC’s memory. If there are a lot of MicroTech controllers, it may be a good idea to

periodically save the configuration data into the BACdrop gateway (i.e., click Finish) during the

process.

Task 2: Configuring a Level-1 MicroTech Supervisory Controller

This task does not apply unless your network has one of the following MicroTech supervisory

controllers:

•

Chiller System Controller (CSC)

•

Remote Monitoring and Sequencing Panel (RMS)

•

Remote Monitoring and Control Panel (RMC)

•

Lead-Lag/Load Balance Panel (LLLB)

If there is no MicroTech supervisory controller, go on to the next task.

If there is a MicroTech supervisory controller, it needs to be configured so that it polls the level-2

BACdrop. This gives the BAS access to all MicroTech controllers on the network.

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McQuay IM 689-2 Installation & Maintenance Data

Brand: McQuay

Model: IM 689-2

Category: Networking

Type: Installation & Maintenance Data

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McQuay IM 689-2 Installation & Maintenance Data

McQuay IM 689-2 Installation & Maintenance Data

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