BACnet PTP Serial Driver Manual
Page 29 of 34
Legal Value
Description
Reliability
The Reliability property, of type BACnetReliability, provides an indication of
whether the Present_Value or the operation of the physical input in question is
"reliable" as far as the BACnet Device or operator can determine and, if not, why.
The following values are supported:
NO_FAULT_DETECTED, UNRELIABLE_OTHER
Priority_Array
This property relates to Output and Value Object Types and is a read only array
that contains prioritized commands or NULLs in the order of decreasing priority.
The highest priority (lowest array index) with a non-NULL value is the active
command.
State_Text
Relevant to Multistate Object Types: This property is a BACnetARRAY of
character strings representing descriptions of all possible states of the
Present_Value. The number of descriptions matches the number of states defined
in the Number_Of_States property. The Present_Value, interpreted as an integer,
serves as an index into the array.
Number_Of_States
Relevant to Multistate Object Types: this property sets the total number of states
for which descriptions will be returned as defined under the State_Text property.
The number of states will be determined automatically by the largest state number
used when configuring the Offset Table (refer to
Max_Master
Relevant to BACnet MS/TP Device Object Type: The Max_Master property, of
type Unsigned, shall be present if the device is a master node on an MS/TP
network. The value of Max_Master specifies the highest possible address for
master nodes and shall be less than or equal to 127. If the Max_Master property is
not writeable via BACnet services, its value shall be 127.
Max_Info_Frames
Relevant to BACnet MS/TP Device Object Type: The Max_Info_Frames property,
of type Unsigned, shall be present if the device is a node on an MS/TP network.
The value of Max_Info_Frames specifies the maximum number of information
frames the node may send before it must pass the token. If Max_Info_Frames is
not writable or otherwise user configurable, its value shall be 1.
Active_Text
Relevant to Binary Object Types: This property, of type CharacterString,
characterizes the intended effect of the ACTIVE state of the Present_Value
property from the human operator's viewpoint. The content of this string is a local
matter, but it is intended to represent a human-readable description of the ACTIVE
state. For example, if the physical input is a switch contact, then the Active_Text
property might be assigned a value such as "Fan 1 On".
Inactive_Text
This property, of type CharacterString, characterizes the intended effect of the
INACTIVE state of the Present_Value property from the human operator's
viewpoint. The content of this string is a local matter, but it is intended to represent
a human-readable description of the INACTIVE state. For example, if the physical
input is connected to a switch contact, then the Inactive_Text property might be
assigned a value such as "Fan 1 Off".
Description
A character string giving more information about the Object associated with the
Present_Value property.
Firmware_revision
The firmware revision of the application.
Relinquish_Default
This property is the default value to be used for the Present_Value property when
all command priority values in the Priority_Array property have a NULL value.
