Byte 0 is the data coding byte for all measurement packages. The default unit has bits 0,1,2,3 set to 0000 and the first optional unit 0001 and so on. It also have a field for the item ( if more than one sensor is controlled by the node) that the value belongs to.

Undefined measurement value.

This is a discrete value typical for a count. There is no unit for this measurement just a discrete value.

Default unit: Meter. 

This is a measurement of a length or a distance.

Default unit: Kilogram.

This is a measurement of a mass.

Default unit: Millisecond.
Opt. unit: (1) Second
 Absolute: (2) y-y-m-d-h-m-s (binary)
   String: (3) HHMMSS

Time since Epoch (00:00:00 UTC, January 1, 1970).

Default unit: Ampere.

This is a measurement of an electric current.

Default unit: Kelvin.
Opt. unit: Degree Celsius (1), Fahrenheit (2)

This is a measurement of a temperature.

Default unit: Mole.

This is a measurement of an amount of a substance.

Default unit: Candela.

This is a measurement of luminous intensity.

Default unit: Hertz.

This is a measurement of regular events during a second.

Default unit: Becquerel.

This is a measurement of rates of things, which happen randomly, or are unpredictable.

Default unit: Newton.

This is a measurement of force.

Default unit: Pascal.

This is a measurement of pressure.

Default unit: Joule.

This is a measurement of energy.

Default unit: Watt.

This is a measurement of power.

Default unit: Coulomb.

This is a measurement electrical charge.

Default unit: Volt.

This is a measurement of electrical potential.

Default unit: Farad.

This is a measurement of electric capacitance.

Default unit: Ohm.

This is a measurement of resistance.

Default unit: Siemens.

This is a measurement of electrical conductance.

Default unit: Ampere meters.

This is a measurement of magnetic field strength.

Default unit: Weber.

This is a measurement of magnetic flux.

Default unit: Tesla.

This is a measurement of flux density or field strength for magnetic fields (also called the magnetic induction).

Default unit: Henry.

This is a measurement of inductance.

Default unit: Lumen      (lm= cd * sr)

This is a measurement of luminous Flux.

Default unit: Lux ( lx = lm / m² )

This is used to express both Illuminance (incidence of light) and Luminous Emittance (emission of light).

Default unit: Gray.
Opt unit: Sievert.

This is a measurement of a radiation dose (Absorbed dose of ionizing radiation).

Default unit: Katal.

This is a measurement of catalytic activity used in biochemistry.

Default unit: qubic meter
Opt. Unit: Liter (dm³).

This is a measurement of volume.

Default unit: Bel.
Opt Unit: Neper.

This is a measurement of sound intensity.

Default unit: Radian (Plane angles).
Opt Unit: Steradian (Solid angles)
Opt Unit: Degree
Opt Unit: Arcminute
Opt Unit: Arcseconds

This is a measurement of an angle.

Default unit: Longitude/Latitude.

This is a measurement of a position.

Default unit: Meters per second.

This is a measurement of a speed.

Default unit: Meters per second/second.

This is a measurement of acceleration.

Default unit: N/m.

This is a measurement of tension.

Default unit: Relative percentage 0-100%.

This is a measurement of relative moistness (Humidity).

Default unit: Qubic meters/second.
Opt Unit: Liter/Second.

This is a measurement of flow.

Default unit: Thermal ohm K/W.

This is a measurement of thermal resistance.

Default unit: Diopter (dpt) m-1.

This is a measurement of refractive power.

Default unit: Poiseuille (Pl) Pa . s.

This is a measurement of dynamic viscosity.

Default unit: Rayal Pa . s/m.

This is a measurement of sound impedance.

Default unit: Acoustic ohm Pa . s/ m3.

This is a measurement of refractive power.

Default unit: Darag F-1.

This is a measurement of electric elasticity.

Default unit: Talbot ( tb = lm * s)
This is a measurement of luminous energy.

Default unit: Nit (nt = cd / m²) 
This is a measurement of luminance.

Default unit: Molal mol/kg.

This is a measurement of chemical concentration.

Reserved (previously was doublet of Type 26, don't use any longer!)

Default unit: Sievert J/Kg.

This is a measurement of dose equivalent.

Reserved (was doublet of type 24, do not use any longer!)

Default unit: Kelvin.
Opt. unit: Degree Celsius (1), Fahrenheit (2)

This is a measurement of the Dew Point.

Default unit: Relative value.

This is a relative value for a level meaurement without a unit. It is just relative to the min/max value for the selected data representation.

Default unit: Meter. 
Opt. unit: Feet(1), inches (2)

Altitude in meters.

Default unit: square meter (m²)

Area in square meter.

Default unit: watt per steradian ( W / sr )

Radiated power per room angle.

Default unit: att per steradian per square metre ( W / (sr * m²) )

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Default unit: watt per square metre  ( W / m² )

Power emitted from or striking onto a surface or area.

Default unit: watt per steradian per square metre per nm (W·sr-1·m-2·nm-1)
Opt. Units:
watt per steradian per metre3 (W·sr-1·m-3)
watt per steradian per square metre per hertz (W·sr-1·m-3)

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Default unit: watt per square metre per nm (W·m-2·nm-1)
Opt. Units:
watt per metre3 (W·m-3)
watt per square metre per hertz	(W·m-2·Hz-1)

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