FieldServer LonWorks FS-8700-21 - Manual (Page 13)

FS-8700-21 LonWorks Manual Page 13 of 72
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6.2.3.2 Driver Related Map Descriptor Parameters
Column Title Function Legal Values
Node_Name
Name of Node to fetch data from or send data to. Needed for
Explicit Addressing. One of the Node names
specified in Section 6.2.2
SNVT_Type Standard network variable type of the data See Appendix D
SNVT_Option* Specifies which record out of a complex SNVT we are after. See Appendix A.9.1
SNVT_Units* Specifies the measurement units (e.g. Metric or English) See Appendix A.9.2
UNVT_Byte_Length*
Specifies the length in bytes of an UNVT. This Parameter is
compulsory when SNVT_Type is set to UNVT, the parameter is not
used in conjunction with SNVT’s
1-255. See Appendix A.1
UNVT_ID
Specifies the Type Number to apply to this particular UNVT. This
Parameter is optional when SNVT_Type is set to UNVT, the
parameter is not used on conjunction with SNVT’s
0, 146-255. See Appendix
A.1
NV_Min_Value*
Network Variable updates with values less than specified in this field
will be ignored.
See Appendix A.2
NV_Max_Value*
Network Variable updates with values higher than specified in this
field will be ignored.
See Appendix A.2
NV_Delta_Value*
Network Variable updates where the value’s delta change is less
than specified in this field will be ignored unless the Max_Scan_Time
Condition has been met. Compulsory for Throttling Lon Functions,
used on other Lon Functions. It is possible to configure a start-up
write option for throttling Map Descriptor functions instead of
waiting for the minimum scan time to pass. Refer to Appendix A.3.
See Appendix A.2
NV_Selfdoc_Text* The Self-Documenting String for this Network Variable.
Normal Text up to a length
of 40 characters. Defaults to
"" for parameters using
string values and 0 for
parameters using numeric
values
6.2.3.3 Timing Parameters
Column Title Function Legal Values
Scan_Interval Seconds per scan 0-32000
Min_Scan_Time Minimum Scan Time in seconds. See 0
Max_Scan_Time Maximum Scan Time in seconds. See 0