McQuay MicroTech MAG User manual

Open Protocol Data Information Packet Version 2.0
Group: Controls
Date: January 1998
© 2002 McQuay International
MicroTech®
Absorption Chiller
Open Protocol™Data Communications

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MicroTech Absorption Chiller Open Protocol Data Information 2
- C O N F I D E N T I
A L -
This Document may not be
copied or reproduced in any
way without the express
written consent of McQuay
International.
NOTICE
Copyright 1994,1998
McQuay International,
Minneapolis MN
All rights reserved
throughout the world.
McQuay International
reserves the right to change
any information contained
herein without prior notice.
No guarantees are given as to
the accuracy of information
provided.

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3MicroTech Absorption Chiller Open Protocol Data Information
Contents
Revision History ................................................................................................................................... 3
This is the first release. All information is new.Overview................................................3
Purpose.................................................................................................................................................. 4
MicroTech Absorption Gateway ..........................................................................................5
Purpose.................................................................................................................................................. 5
Components .......................................................................................................................................... 5
Connecting to the MicroTech Absorption Gateway ............................................................................. 5
Converting between a Direct Connect and a Network MAG................................................................ 5
Diagnostic Variables ............................................................................................................................. 6
McQuay Absorption Chiller Variables .................................................................................8
Memory Map......................................................................................................................................... 8
Analog Data .......................................................................................................................................... 8
Digital Input Data................................................................................................................................ 10
Digital Output Data............................................................................................................................. 14
SW3 Status.......................................................................................................................................... 16
Start/Stop Data .................................................................................................................................... 17
Operating Time (Hours)...................................................................................................................... 17
Operating Time (Minutes/Seconds) .................................................................................................... 18
ID Code/PID Sampling/Data Pointer(s).............................................................................................. 19
Data Setting......................................................................................................................................... 21
Alarm Data.......................................................................................................................................... 23
Glossary of Terms ...............................................................................................................39
Index .....................................................................................................................................40
Revision History
Revisions
Version 2.0
Removed Network and Gateway diagrams which are now available in CD 573875Y, Open Protocol
Certified Drawings.
Version 1.5
This version includes the LC type absorption chiller unit.
Version 1.1
This is a formatting revision.
Version 1.0
This is the first release. All information is new.Overview

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MicroTech Absorption Chiller Open Protocol Data Information 4
Purpose
The purpose of the McQuay International Open Protocolfor McQuayabsorption chillers is to
allow other automation integrators the ability to communicate with a McQuay absorption chiller.
Communications will be established through a MicroTechinterface panel that will communicate
with the McQuay Absorption Chiller. This interface panel is called the MicroTech Absorption
Gateway (MAG). Licensed BAS companies will be allowed to communicate with the MAG to
retrieve information about the McQuay absorption chiller via Open Protocol.
The results of Open Protocol can be summarized as follows:
Reading of the following Analog Information
•Chilled Water Inlet & Outlet Temperatures
•Hot Water Inlet & Outlet Temperatures
•Low & High Temperature Generator Temperatures
•Cooling Water Inlet & Outlet Temperatures
•Condensation Temperature
•Remote Reset Setting
•Exhaust Gas Temperature/Steam Condensate Temperature
•Fuel Control Valves 1 & 2 Position
•Inverter Output Signal
•Steam Control Valve Output Signal
Reading of the following Digital Output Information
•Absorbent Solution Pumps
•Refrigerant Pump
•Ignition Signal
•Heating, Cooling, Simultaneous, and Alarm Indicators
•SVRP and SVRU valves
•Cooling Main / Heating Main
Reading of the following Digital Input Information
•Alarms
•Starts/Stops of pumps and blowers
•Combustion Signal
•Remote Start/Stop Signal
Access to the absorptio
n

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5MicroTech Absorption Chiller Open Protocol Data Information
MicroTech Absorption Gateway
Purpose
The purpose of the MicroTech Absorption Gateway (MAG) is to read data from the McQuay
absorption chiller and store it so that automation integrators can read the status of the McQuay
absorption chiller. The automation integrators will get their data from the MAG and not directly
from the McQuay absorption chiller. The MAG continuously updates its information about the
status of the McQuay absorption chiller. All data from the MAG that comes directly from the
McQuay absorption chiller is read only; no data point can be changed through Open Protocol.
Components
This section will be used to explain the MAG hardware components. The components needed will
depend upon the number of McQuay chillers. A MAG that is in a network of two or more McQuay
Absorption Gateways and an OPM Panel will be referred to as a "Network MicroTech Absorption
Gateway." A MAG that is not in a network with an OPM Panel and other MAGs will be referred to
as "Direct Connect MicroTech Absorption Gateway". The generic name of "MicroTech Absorption
Gateway " (“MAG”) will be used when describing features that are common to both the Network
MAG and the Direct Connect MAG.
Connecting to the MicroTech Absorption Gateway
Network MAG
A Network MAG will be used whenever an Open Protocol Master (OPM) Panel is used. The OPM
provides a single communications port entry into a MicroTech network. The OPM consists of an
EnergyLine model 120 controller. The automation integrator at a licensed BAS company connects to
Comm Port A of the OPM, which is preconfigured for Open Protocol communications at 9600 baud.
Comm Port B of the OPM is a daisy chained, multidrop, 9600 baud, RS-485, proprietary McQuay
International Protocol Port. Comm Port B of the OPM will be connected to a MicroTech network.
The only way to read information from a Network MAG is through an OPM Panel. Direct
connection to a Network MAG is not possible because Comm Port B is configured for SLAVE, 9600
baud and Comm Port A, which is dedicated to receiving data from the McQuay absorption chiller, is
configured as USER, 4800 baud.
Direct Connect MAG
A Direct Connect MAG can be used whenever a single McQuay absorption chiller is used with Open
Protocol. A Direct Connect MAG cannot be used with an OPM Panel or in a MicroTech network.
A Direct Connect MAG’s Comm Port A is used to communicate with the automation integrator, and
Comm Port B is used to communicate with the Absorption Chiller Controller. Comm Port A, which
is the automation control integrator's Open Protocol communications port, is preconfigured for TTY,
Open Protocol communications at 9600 baud. Comm Port B, which is dedicated to receiving data
from the McQuay absorption chiller, is configured for USER, 4800 baud.
Converting between a Direct Connect and a Network MAG
Overview
Converting from either a Direct Connect MAG to a Network MAG or a Network MAG to a Direct
Connect MAG is done by downloading controller code to the MAG. In either case, monitor package
will be used to make the conversion.
The Network MA
G
Connect MAG each c
o
c

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MicroTech Absorption Chiller Open Protocol Data Information 6
Direct Connect MAG to a Network MAG
The Direct Connect MAG can be direct connected to through its Comm Port A. Once Network
MAG controller code has been downloaded, the communications lines must be changed and its
address changed to the location the controller will occupy in the MicroTech network. The
communications line that is connected to the Absorption Unit Controller must be moved from Comm
Port B to Comm Port A on the Network MAG.
Network MAG to a Direct Connect MAG
The only way to direct connect to a Network McQuay Gateway is to change the controller address to
FF and reset power. This will change Comm Port B to 9600 baud TTY and direct connection will be
possible. During this time, communications with the McQuay absorption chiller will be lost. Once
Direct Connect MAG controller code has been downloaded, the communications lines must be
changed and the address set to 00. The communications line that is connected to the Absorption Unit
Controller must be moved from Comm Port A to Comm Port B on the Direct Connect MAG.
OPM
Network Network
MAG
Comm Port B
Comm Port B
McQuay
Comm Port A
Network Sanyo Gateway
TC
Comm
Device
Comm Port A
Comm Port B
Direct
C
onnect
S
anyo
Gateway
Communications Line to Change
MAG
Absorption
Chiller
McQuay
Absorption
Chiller Chiller
Absorption
McQuay
MAG
Direct
Connect
Diagnostic Variables
Following is a list of diagnostic memory locations that can be read in the MAG.
Description Address Range Conversion
Communications Check Output 0700 0-255 See Below
Sending or Receiving Data Output 0701 0-255 See Below
Processing Data Output 0702 0-255 See Below
Processing Alarm Data Output 0703 0-255 See Below
Communications Error 040D 0, 1 0= OK
1 = Comm
Error

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7MicroTech Absorption Chiller Open Protocol Data Information
Communications Check Output 0700
This is the memory location that contains the status of digital output 0. A 0 indicates the output is off
and a 1-255 indicates the output is on. This output is on for one second and off for one second if
communications exist between the MAG and the Absorption Unit Controller. The output is on for
two-tenths of a second and off for two-tenths of a second if communications do not exist between the
MAG and the Absorption Unit Controller. This location is a countdown timer for how long the
output has left to be on. If the location has a value of 9, the output has nine-tenths of a second left to
be on. A value of 0 means that the output is off.
Sending or Receiving Data Output 0701
This is the memory location that contains the status of digital output 1. A 0 indicates the output is off
and a 1-255 indicates the output is on. This output is on if the MAG is either sending or receiving
data to or from the Absorption Unit Controller. This output is off if the MAG is not communicating
with the Absorption Unit Controller. This output cycles off and on as the MAG communicates with
or processes data from the Absorption Unit Controller. When this output is on, the Processing Data
and Processing Alarm Data Outputs will be off. The MAG will either communicate with or process
data from the Absorption Unit Controller. Communication and processing will not occur at the same
time.
Processing Data Output 0702
This is the memory location that contains the status of digital output 2. A 0 indicates that output is
off and a 1-255 indicates the output is on. This output is on when the MAG is processing non-alarm
data it has received from the Absorption Unit Controller. Alarm data processing is indicated by
another output. This output is off if the MAG is not processing data from the Absorption Unit
Controller. This output cycles off and on as the MAG communicates with or processes data from the
Absorption Unit Controller. When this output is on, the Sending or Receiving Data and Processing
Alarm Data Outputs will be off. The MAG will either communicate with or process data form the
Absorption Unit Controller. Communication and processing will not occur at the same time.
Processing Alarm Data Output 0703
This is the memory location that contains the status of digital output 3. A 0 indicates that output is
off and a 1-255 indicates the output is on. This output is on when the MAG is processing alarm data
it has received from the Absorption Unit Controller. Non-alarm data processing is indicated by
another output. This output is off if the MAG is not processing alarm data from the Absorption Unit
Controller. This output cycles off and on as the MAG communicates with or processes data from the
Absorption Unit Controller. When this output is on, the Sending or Receiving Data and Processing
Data Outputs will be off. The MAG will either communicate with or process data form the
Absorption Unit Controller. Communication and processing will not occur at the same time.

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MicroTech Absorption Chiller Open Protocol Data Information 8
McQuay Absorption Chiller Variables
Memory Map
All of these memory locations are in the MAG. All of the following memory locations are in
hexadecimal notation. Memory location 1342 will actually be $1342 (Hexadecimal memory
location 1342).
Table Heading Definitions
Description - This is the terminology used to describe the data point.
Address - This is the memory location(s) that holds the information for the data point.
Range - This can contain either a description of the address locations or a numerical range the
location(s) will contain.
Conversion - This is how the raw data needs to be converted to get the correct data reading.
DCH - If this area contains an "X", this data point is applicable for DC-H units.
DCS - If this area contains an "X", this data point is applicable for DC-S units.
DCU - If this area contains an "X", this data point is applicable for DC-U units.
NCU - If this area contains an "X", this data point is applicable for NC-U units.
LCU - If this area contains an "X", this data point is applicable for LC-U units.
Analog Data
Description Address Range Units D
C
H
D
CS
D
C
U
N
C
U
L
C
U
Chilled Water Inlet Temperature
(Only while in Cooling or
Simultaneous units)
11B2
11B3
Hi Byte
Lo Byte
0.1*X+0=°F XXXXX
Chilled Water Outlet Temperature
(Only while in Cooling or
Simultaneous units)
11B0
11B1
Hi Byte
Lo Byte
0.1*X+0=°F XXXXX
Condensed Refrigerant Temperature 11C2
11C3
Hi Byte
Lo Byte
0.1*X+0=°F XXXXX
Cooling Water Inlet Temperature 11BE
11BF
Hi Byte
Lo Byte
0.1*X+0=°F XXXXX
Cooling Water Outlet Temperature 11C0
11C1
Hi Byte
Lo Byte
0.1*X+0=°F XXXXX
Exhaust Gas Temperature (DC-*) or
Steam Condensate Temperature
(NC-U)
11C6
11C7
Hi Byte
Lo Byte
0.1*X+0=°F XXXX
Fuel Control Valve 1 (%) 119A
119B
Hi Byte
Lo Byte
0.1*X+0=% XXX
Fuel Control Valve 2 (%) 119C
119D
Hi Byte
Lo Byte
0.1*X+0=% X
High Temperature Generator
Temperature
11C4
11C5
Hi Byte
Lo Byte
0.1*X+0=°F XXXXX
Hot Water Inlet Temperature
(Only while in Heating)
11B8
11B9
Hi Byte
Lo Byte
0.1*X+0=°F X

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9MicroTech Absorption Chiller Open Protocol Data Information
Description Address Range Units D
C
H
D
CS
D
C
U
N
C
U
L
C
U
Hot Water Inlet Temperature (Only
for DC-S & DC-H units)
11BA
11BB
Hi Byte
Lo Byte
0.1*X+0=°F X X
Hot Water Outlet Temperature
(Only while in Heating)
11B4
11B5
Hi Byte
Lo Byte
0.1*X+0=°F X
Hot Water Outlet Temperature
(Only for DC-S & DC-H units)
11B6
11B7
Hi Byte
Lo Byte
0.1*X+0=°F X X
Invertor Output Signal 119E 0-200 0.303*X+0 =Hz XXXXX
Low Temperature Generator
Temperature
11BC
11BD
Hi Byte
Lo Byte
0.1*X+0=°F XXXX
Remote Reset Current Signal 1196
1197
Hi Byte
Lo Byte
0.1*X+0=mA XXXXX
Steam Control Valve Output Signal 11E0
11E1
Hi Byte
Lo Byte
0.1*X+0=% X X
Chilled Water Inlet Temperature 11B2,11B3
This is the Chilled Water Inlet Temperature. These locations contain valid data only when the
Chiller/Heater is in the cooling mode or in the Simultaneous mode. This location is read by forming
the high byte (11B2) and the low byte (11B1) into a two byte number and dividing by 10 (0.1 * X +
0 = °F).
Chilled Water Outlet Temperature 11B0,11B1
This is the Chilled Water Outlet Temperature. These locations contain valid data only when the
Chiller/Heater is in the cooling mode or Simultaneous mode. These locations are read by forming
the high byte (11B0) and the low byte (11B1) into a two byte number and dividing by 10 (0.1 * X +
0 = °F).
Condensed Refrigerant Temperature 11C2,11C3
This is the Condensed Refrigerant Temperature. These locations are read by forming the high byte
(11C2) and the low byte (11C3) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
Cooling Water Inlet Temperature 11BE,11BF
This is the Cooling Water Inlet Temperature. These locations are read by forming the high byte
(11BE) and the low byte (11BF) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
Cooling Water Outlet Temperature 11C0,11C1
This is the Cooling Water Outlet Temperature. These locations are read by forming the high byte
(11C0) and the low byte (11C1) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
Exhaust Gas Temperature/Steam Condensate Temperature 11C6,11C7
This is the Exhaust Gas (DC-H, DC-S, DC-U) or Steam Condensate Temperature (NC-U). This
location is the Exhaust Gas Temperature for DC units or the Steam Condensate Temperature for NC
units. These locations are read by forming the high byte (11C6) and the low byte (11C7) into a two
byte number and dividing by 10 (0.1 * X + 0 = °F).
Fuel Control Valve 1 Output Signal 119A,119B
This is the Fuel Control Valve 1 Feedback Signal. These locations are read by forming the high byte
(119A) and the low byte (119B) into a two byte number and dividing by 10 (0.1 * X + 0).
Fuel Control Valve 2 Output Signal 119C,119D
This is the Fuel Control Valve 2 Feedback Signal. These locations are applicable on Simultaneous
units only (DC-S). These locations are read by forming the high byte (119C) and the low byte
(119D) into a two byte number and dividing by 10 (0.1 * X + 0).
High Temperature Generator Temperature 11C4,11C5
This is the High Temperature Generator Temperature. These locations are read by forming the high
byte (11C4) and the low byte (11C5) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

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MicroTech Absorption Chiller Open Protocol Data Information 10
Hot Water Inlet Temperature 11B8,11B9
This is the Hot Water Inlet Temperature for DC-U units. These locations contain valid data only
when the Chiller/Heater is in the heating mode. These locations are read by forming the high byte
(11B8) and the low byte (11B9) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
Hot Water Inlet Temperature 11BA,11BB
This is the Hot Water Inlet Temperature. These locations are valid only for Simultaneous
Chiller/Heater units (DC-S) and Hot Water units (DC-H). These locations are read by forming the
high byte (11BA) and the low byte (11BB) into a two byte number and dividing by 10 (0.1 * X + 0
= °F).
Hot Water Outlet Temperature 11B4,11B5
This is the Hot Water Outlet Temperature for DC-U units. These locations contain valid data only
when the Chiller/Heater is in the heating mode. These locations are read by forming the high byte
(11B4) and the low byte (11B5) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).
Hot Water Outlet Temperature 11B6,11B7
This is the Hot Water Outlet Temperature. These locations are valid only for Simultaneous
Chiller/Heater units (DC-S) and Hot Water units (DC-H). These locations are read by forming the
high byte (11B6) and the low byte (11B7) into a two byte number and dividing by 10 (0.1 * X + 0 =
°F).
Invertor Output Signal 119E
This is the output signal to the Invertor. This location is read by taking byte 119E and dividing by
3.3 (.30303 * X + 0 = Hz)
Low Temperature Generator Temperature 11BC,11BD
This is the Low Temperature Generator Temperature. These locations are read by forming the high
byte (11BC) and the low byte (11BD) into a two byte number and dividing by 10 (0.1 * X + 0 = °F)
Remote Reset Current Signal 1196,1197
This is the Remote Reset Current Signal from the BAS company. This is used to offset from the
heating or cooling setpoint, depending on the mode of the Chiller/Heater unit. These locations are
read by forming the high byte (1196) and the low byte (1197) into a two byte number and dividing
by 10 (0.1 * X + 0 = mA).
Steam Control Valve Output Signal 11E0,11E1
This is the output signal to the Steam Control Valve. This is only applicable on NC-U units. These
locations are read by forming the high byte (11E0) and the low byte (11E1) into a two byte number
and dividing by 10 (0.1 * X + 0 = %).
Digital Input Data
Description Address Range Units D
C
H
D
C
S
D
C
U
N
C
U
L
C
U
Absorbent Pump 1 or Invertor
(Alarm)
1281
BIT 1
0=Normal
1=Alarm XXXX
X
Absorbent Pump 1 (Off/On) 1282
BIT 7
0=Off
1=On XXXXX
Absorbent Pump 2 (Alarm) 1281
BIT 2
0=Normal
1=Alarm XXXXX
Absorbent Pump 2 (Off/On) 1283
BIT 0
0=Off
1=On XXXXX