FieldServer FS-8704-06 - Manual (Page 26)

FS-8704-06 BACnet IP Driver Manual Page 26 of 57
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Appendix A.7. BACnet State Text Preload
BACnet Multistate Objects have a State_Text property. This property is defined as an array 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.
When Multistate Objects are configured on a BACnet server it is necessary to define the State_Text property. This section illustrates how to define the
State_Text character strings and how to associate these definitions with Multistate Server Map Descriptors.
The maximum permitted length of any State_Text string is 50 characters.
Appendix A.7.1. Method 1 – Using an Offset/User Table:
//set up a look up table
Offset_Table
Offset_Table_Name , Table_String , Table_Index_Value
FIRE_ALRM_TEXT , SYSTEM READY , 1
FIRE_ALRM_TEXT , ALARM , 2
FIRE_ALRM_TEXT , MAINTENANCE , 3
FIRE_ALRM_TEXT , OFF-LINE , 4
FIRE_ALRM_TEXT , IN SERVICE , 5
FIRE_ALRM_TEXT , OTHER , 6
Data_Arrays
Data_Array_Name , Data_Format , Data_Array_Length
DA_MI_01
, UINT16 , 100
Map_Descriptors
Map_Descriptor_Name , Data_Array_Name , Data_Array_Offset , Function , Node_Name , Object_Type , Object_Instance , Length , State_Text_Array
CMD_MI_01
, DA_MI_01 , 0 , Passive , N1 11 , MI , 1 , 1 , Fire_Alrm_Text
Valid values are 1
to 16.