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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