FieldServer Technologies FS-8700-21 Manual

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FS-8700-21 LonWorks Manual Page 28 of 62

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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