FieldServer LonWorks FS-8700-21 - Manual (Page 32)

FS-8700-21 LonWorks Manual Page 32 of 72
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Appendix A.9. Filtering SNVT Variables
Appendix A.9.1. SNVT_Option Field
This field can be used to isolate a specific record within a complex SNVT. Appendix D shows which SNVTs are
currently attributed with SNVT_Option capabilities.
Appendix A.9.2. SNVT_Units Field
The measurement units of a SNVT is fixed as far as it is transported across the LonWorks network, but by the
setting of the SNVT_Units field it is possible to specify how the data is made available in Data Arrays. For example
SNVT_temp_f is always transported across the LonWorks network as degrees Celsius, but by setting the
SNVT_Units field to Deg_F the measurement units of the Map Descriptor’s data will be set to degrees Fahrenheit.
The following table shows which SNVT’s currently have SNVT_Units capabilities.
SNVT_Type SNVT_Option SNVT_Units Length Measurement Units
SNVT_press_f N/A Inch_H20 1 Inches of water
SNVT_press_p N/A Inch_H20 1 Inches of water
SNVT_temp N/A
Raw 1 Raw, unadjusted data
Deg_C 1 Degrees Celsius (°C)
Deg_F 1 Degrees Fahrenheit (°F)
SNVT_temp_f N/A
Deg_C 1 Degrees Celsius (°C)
Deg_F 1 Degrees Fahrenheit (°F)
SNVT_temp_p N/A
Raw 1 Raw, unadjusted data
Deg_C 1 Degrees Celsius (°C)
Deg_F 1 Degrees Fahrenheit (°F)
SNVT_switch
1
All Raw 2 Raw, unadjusted data
Value
Raw 1 Raw, unadjusted data
Percent 1 Percent (%)
State Raw 1 Raw, unadjusted data
1 See Also Appendix A.8