Orion System BACnet Link - Manual (Page 13)

BACnet® Link Interface
Technical Guide
13
Programming - Proprietary Objects
BACnet ® Link Overview
The BACnet ® Link provides the communications interface between the
Orion system and a BACnet ® network. One BACnet ® Link can support
up to sixteen controllers. The BACnet ® Link connects to the BACnet ®
network using Master-Slave/Token Passing (MS/TP) LAN data link
protocol. Complete information regarding the BACnet
® Link device
object can be found on pages 3 through 5 of this manual.
The BACnet ® Link supports 3 different controller types (objects). These
are the Orion MUA II, VAV/CAV and the CW/HW controllers. The
sections that follow describe the properties for each controller (device
object).
MUA II Object
The information that follows describes the characteristics of the MUA
II Object. The properties for the MUA II Object are listed in Table 7.
Object Name
The Object Name for the MUA II controller is a 15 byte character string
that can be set through the BACnet
® front end.
Object Type
The Object Type of the MUA II controller is MuaII or 258.
Object Instance Number
The Instance Number of the MUA II Object is determined by two vari-
able values. The first variable is the loop address setting on the BAC-
net
® Link for the specific loop the MUA II controller resides on and the
second is the MUA II controller address. The BACnet ® Link loop ad-
dress can be either 0, 1, 2 or 3. See Figure 3 at the front of this manual
for detailed information on the BACnet
® Link loop address jumper set-
tings.
The second variable value used to calculate the Object Instance number
is the MUA II controller address and is determined by the address switch
settings on the MUA II controller. Valid address settings are 1 through
16.
See Table 10 at the end of this chapter for complete Object Instance
Number calculation information
Object Properties
The information and tables that follow detail the properties and prop-
erty identifiers for the MUA II Object.
Properties For The MUA II Controller
Property Name Property Data Type
Property
Identifier Read
Or
Write
Alarm_Status MuaIIAlarmBits 1024 R/O
Application_Software_Version Unsigned 11 R/O
Control_Status MuaControlBits 1025 R/O
Cooling_Deadband Unsigned 1026 R/W
Dew_Point_Reset_Limit Unsigned 1029 R/W
Dew_Point_Setpoint Unsigned 1030 R/W
Enthalpy_Deadband Unsigned 1033 R/W
Enthalpy_Unit BACnetEngineeringUnits 1082 R/O
External_Heat_Position Real 1035 R/O
External_Heat_Proportion_Band Unsigned 1034 R/W
Heating_Deadband Unsigned 1036 R/W
Humidity_Unit BACnetEngineeringUnits 1084 R/O
Modulate_Gas_Valve_Position Unsigned 1038 R/O
Object_Identifier BACnetObjectIdentifier 75 R/O
Object_Name CharacterString 77 R/W
Object_Type WattBacObjectTypes 79 R/O
Outdoor_Air_Cooling_Setpoint Real 1041 R/O
Outdoor_Air_Dew_Point Real 1045 R/O
Outdoor_Air_Dew_Point_Setpoint Real 1046 R/O
Outdoor_Air_Enthalpy Real 1047 R/O
Outdoor_Air_Enthalpy_Deadband Real 1049 R/O
Outdoor_Air_Enthalpy_Setpoint Real 1048 R/O
Outdoor_Air_Heating_Setpoint Real 1042 R/O
Outdoor_Air_Humidity Real 1050 R/O
Outdoor_Air_Temperature Real 1052 R/O
Position_Unit BACnetEngineeringUnits 1085 R/O
Reheat_Value_Position Unsigned 1054 R/O
Relays MuaIIRelayBits 1055 R/O
Schedule_Force WattBacScheduleState 1059 R/W
Space_Humidity Real 1060 R/O
Space_Humidity_At_Max_Supply Unsigned 1061 R/W
Space_Humidity_At_Min_Supply Unsigned 1062 R/W
Space_Temperature Real 1064 R/O
Space_Temperature_At_Max_Supply Unsigned 1065 R/W
Space_Temperature_At_Min_Supply Unsigned 1066 R/W
Supply_Air_Reset_Limit Unsigned 1070 R/W
Supply_Air_Setpoint Unsigned 1072 R/W
Supply_Air_Setpoint_Mirror Real 1081 R/O
Supply_Air_Temerature Real 1073 R/O
Temperature_Unit BACnetEngineeringUnits 1086 R/O
Table 7: MUA II Object Properties