Daikin MicroTech II Installation And Maintenance Manual

ED 15062-7 • MICROTECH II CHILLER CONTROLLER 8 www.DaikinApplied.com
basIC ProToCol InformaTIon
basIC ProToCol InformaTIon
BACnet Networks
Compatibility
The MicroTech II Chiller Unit Controller conforms to the
BACnet Standard (ANSI/ASHARE 135-2004) as stated in the
Protocol Implementation and Conformance Statement (PICS).
See BACnet Protocol Implementation Conformance Statement
on page 102.
BACnet Objects
MicroTech II Chiller Unit Controllers incorporate standard
BACnet object types (i.e., object types dened in the BACnet
Standard) and additional proprietary BACnet object types that
conform to the BACnet Standard. and some include additional
proprietary properties. Objects contain properties that control
unit variables or data points. Some object types occur more
than once in the unit controller; each occurrence or instance has
different property values and controls different unit variables or
data points. Each instance is designated with a unique instance
index. Some properties can be adjusted (read/write properties,
e.g., setpoints) from the network and others can only be
interrogated (read-only properties, e.g., status information).
Each data point accessible from a BACnet network is
described with a table that gives the Object Identier, Property
Identier, Full BACnet Reference or path, and the Name
enumeration of the property.
Example of BACnet Data Point
Object Identier Property Identier
Object Type
Type
Enumeration
Instance
Property
Name
Property
Enumeration
Analog Input 0 18 Present Value 85
Object Name
EntCondWaterTemp
Object Identier
Object Identiers are each designated with an Object type as
dened in the BACnet specication. The rst column of the
data point denition gives the object type. This object happens
to be the Entering Condenser Water Temperature.
The object identier is a property of the object that you
can read from the object code. The name of the property
is “Object_Identier” and the property identier is 75. The
ASHRAE BACnet specication reserves the rst 128 numbers
for ASHRAE dened objects. Manufactures may dene
additional object types and assign a number above 127 as long
as they conform to the requirements of the ASHRAE BACnet
specication.
Each object in a chiller controller has a unique identier.
BACnet object identiers are two-part numbers of BACnet
Object Identier data type. The rst part identies the object
type (the rst 10 bits of the 32-bit BACnet Object Identier
[See ANSI/ASHRAE 135-2004 BACnet A Data Communication
Protocol for Building Automation and Control Networks]). The
rst column of the data point denition gives the object type.
The second part identies the instances of that particular object
type (the last 22 bits of the 32-bit BACnet Object Identier).
The object identier is shown in the data points listing as two
numbers. The rst number is shown in the Type Enumeration
column and designates the Object type enumeration.
The second number is shown in the Instance column and
designates the instance of that particular object type.
Each object also has a name. Object names are character
strings. The object name is a property of the object that you
can read from the object. The name of the property is “Object_
Name” and the property identier is 77.
Objects are sometimes referred to as an object type and
instance number as they are in the BACnet specication. The
example object above is Analog Intput, Instance 18.
Property Identier
Each object has a number of properties or attributes. Each
property has a unique identier of BACnet Property Identier
data type. Property identiers are an enumerated set; a
number identies each member. The value of the Property
Identier enumeration is shown in the Property Enumeration
column. In the example above the property identier is 85.
Property Name
Each property also has a unique name. Property names are
character strings and shown in the Property Name column.
In the example above the property name is Present Value
(Property Enumeration 85).
Object Name
This property is a character string that is the unique name of
the object in the BACnet device. In the example above the
object name is EntCondWaterTemp
Property Values
Some properties are standard data types and some are
enumerated sets. If the property value is an enumerated set,
all enumerated values and corresponding meaning are given in
the Property Values column of the data point listing.

Daikin MicroTech II Specifications

General

Brand	Daikin
Model	MicroTech II
Category	Controller
Language	English