FieldServer LonWorks FS-8700-21 - Manual (Page 20)

FS-8700-21 LonWorks Manual Page 20 of 72
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7.2.4 Map Descriptor Example 1 - Explicit Configuration using Network Management Polls
The Map Descriptor pollTemp_p shows the use of SNVT_Units for Scaling when polling temperature
The Map Descriptor pollSwitch shows the use of SNVT_Option for Selective data scanning. This only brings in the “State” portion of SNVT_Switch
Map_Descriptors
Map_Descriptor_Name , Data_Array_Name , Data_Array_Offset , Lon_Function , Function , Node_Name , SNVT_Index , SNVT_Type , SNVT_Units , SNVT_Option , Scan_Interval
pollTemp_p , DA_Explicit , 1 , NMFETCHC , Rdbc , Remote_Node , 0 , SNVT_temp_p , Deg_F , - , 1.0s
pollSwitch , DA_Explicit , 2 , NMFETCHC , Rdbc , Remote_Node , 1 , SNVT_switch , - , State , 1.0s
7.2.5 Map Descriptor Example 2 – Polling UNVT’s
Map_Descriptors
Map_Descriptor_Name , Data_Array_Name , Data_Array_Offset , Lon_Function , Function , Node_Name , SNVT_Index , SNVT_Type , UNVT_Byte_Length , Scan_Interval
pollUNVT , DA_Explicit , 101 , NMFETCHC , Rdbc , Remote_Node , 2 , UNVT , 31 , 1.0s
Explicitly Addressed Client Map Descriptors use
this field to point to their relevant Server Map
Descriptors. Explicitly addressed Client Map Descriptors
use this field to extract the correct variable
from the remote device's external interface.
This field determines the Map
Descriptor’s function. See
Section 7.1.2 for more
information.
UNVT Byte length must be specified for correct
operation.