FieldServer FS-8700-73 - Manual (Page 42)

FS-8700-73 BACnet MSTP Driver Manual Page 42 of 48
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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 Appendix A.5).
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.
Event_Enable
The Event_Enable property is supported, but to save memory it is only instantiated it if a
point is configured for alarming, i.e. if it is set up with a reference to a Notification Class
Map Descriptor.