Matter Specification - Pressure Measurement Cluster

Matter :: Pressure Measurement Cluster

This cluster provides an interface to pressure measurement functionality, including configuration
and provision of notifications of pressure measurements.
압력 측정 센서 (ex: 기압계) 디바이스를 위한 클러스터

1. Classification

Hierarchy	Role	Scope	PICS Code
Base	Application	Endpoint	PRS

2. Identifier

Identifier	Name
0x0403	Pressure Measurement

3. Features

Bit	Code	Feature	Conformance	Summary
0	EXT	Extended	O	Extended range and resolution

4. Attributes

4.1. Measured Value

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0000	MeasuredValue	int16	MinMeasuredValue to MaxMeasuredValue	XP		R V	M

This attribute SHALL represent the pressure in kPa as follows:
MeasuredValue = 10 x Pressure [kPa]
The null value indicates that the value is not available.

**1hPa = 100Pa = 0.1kPa 이므로 MeasuredValue의 단위는 헥토파스칼로 간주하면 된다 **

4.2. Min Measured Value

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0001	MinMeasuredValue	int16	-32767 to MaxMeasuredValue-1	X		R V	M

This attribute SHALL indicate the minimum value of MeasuredValue that can be measured. See
Measured Value for more details.
The null value indicates that the value is not available.

4.3. Max Measured Value

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0002	MaxMeasuredValue	int16	MinMeasuredValue+1 to 32767	X		R V	M

This attribute SHALL indicate the maximum value of MeasuredValue that can be measured. See
Measured Value for more details.
The null value indicates that the value is not available.

4.4. Tolerance

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0003	Tolerance	uint16	0 to 2048		0	R V	O

See Measured Value.

4.5. Scaled Value

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0010	ScaledValue	int16	MinScaledValue to MaxScaledValue	X	0	R V	EXT

This attribute SHALL represent the pressure in Pascals as follows:
ScaledValue = \(10^{Scale} \times Pressure\) [Pa]

The null value indicates that the value is not available.

4.6. Min Scaled Value

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0011	MinScaledValue	int16	-32767 to MaxScaledValue-1	X	0	R V	EXT

This attribute SHALL indicate the minimum value of ScaledValue that can be measured.
The null value indicates that the value is not available.

4.7. Max Scaled Value

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0012	MaxScaledValue	int16	MinScaledValue+1 to 32767	X	0	R V	EXT

This attribute SHALL indicate the maximum value of ScaledValue that can be measured.
The null value indicates that the value is not available.

4.8. Scaled Tolerance

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0013	ScaledTolerance	uint16	0 to 2048		0	R V	[EXT]

This attribute SHALL indicate the magnitude of the possible error that is associated with ScaledValue.
The true value is located in the range
(ScaledValue – ScaledTolerance) to (ScaledValue + ScaledTolerance).

4.9. Scale

ID	Name	Type	Constraint	Quality	Default	Access	Conformance
0x0014	Scale	int8	-127 to 127		0	R V	EXT

This attribute SHALL indicate the base 10 exponent used to obtain ScaledValue (see ScaledValue).

5. Measured Value

5.1. Constraint

Where MinMeasuredValue or MaxMeasuredValue attributes are mandatory the null value MAY be used to indicate that a limit is unknown.

For any measurement cluster with MeasuredValue, MinMeasuredValue and MaxMeasuredValue attributes, the following SHALL be always be true:

• If MinMeasuredValue and MaxMeasuredValue are both known, then MaxMeasuredValue SHALL be greater than MinMeasuredValue.
• If MaxMeasuredValue is known, then MeasuredValue SHALL be less than or equal to MaxMeasuredValue.
• If MinMeasuredValue is known, then MeasuredValue SHALL be greater than or equal to MinMeasuredValue.

5.2. Tolerance

For any measurement cluster with a MeasuredValue and Tolerance attribute, when Tolerance is implemented the following SHALL always be true:

• The Tolerance attribute SHALL indicate the magnitude of the possible error that is associated with MeasuredValue attribute, using the same units and resolution. The true value SHALL be in the range (MeasuredValue – Tolerance) to (MeasuredValue + Tolerance).
• If known, the true value SHALL never be outside the possible physical range. Some examples:
  • a temperature SHALL NOT be below absolute zero
  • a concentration SHALL NOT be negative