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_UnitsLength | Measurement Units | ||
SNVT_press_f | N/A | Inch_H20 | 1 | Inches of water | |
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SNVT_press_p | N/A | Inch_H20 | 1 | Inches of water | |
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| Raw | 1 | Raw, unadjusted data | |
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SNVT_temp | N/A | Deg_C | 1 | Degrees Celsius (°C) | |
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| Deg_F | 1 | Degrees Fahrenheit (°F) | |
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SNVT_temp_f | N/A | Deg_C | 1 | Degrees Celsius (°C) | |
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Deg_F | 1 | Degrees Fahrenheit (°F) | |||
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| Raw | 1 | Raw, unadjusted data | |
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SNVT_temp_p | N/A | Deg_C | 1 | Degrees Celsius (°C) | |
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| Deg_F | 1 | Degrees Fahrenheit (°F) | |
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| All | Raw | 2 | Raw, unadjusted data | |
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SNVT_switch1 | Value | Raw | 1 | Raw, unadjusted data | |
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Percent | 1 | Percent (%) | |||
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| State | Raw | 1 | Raw, unadjusted data | |
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1See Also Appendix A.8
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