2.2.115. Thermostat Setback Command Class, version 1¶

The Thermostat Setback Command Class is used to change the current state of a non-schedule setback thermostat.

2.2.115.1. Thermostat Setback Set Command¶

This command is used to set the state of the thermostat.

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Command Class = COMMAND_CLASS_THERMOSTAT_SETBACK (0x47)
Command = THERMOSTAT_SETBACK_SET (0x01)
Reserved						Setback Type
Setback State

Setback Type (2 bits)

The setback type field MUST comply with Table 2.537.

Table 2.537 Thermostat Setback Set::Setback Type encoding¶
Value	Description
0x00	No override
0x01	Temporary override
0x02	Permanent override
0x03	Reserved

Note

The temporary override provides an opportunity to implement a timer or equivalent in the device. A temporary override will, if a timer is implemented, be terminated by the timer. If no timer is implemented the temporary override MUST act as permanent override. If the temporary override is implemented it MUST be documented in the user’s manual.

Setback State (8 bits)

The Setback State MUST comply with Table 2.538.

Table 2.538 Thermostat Setback Set::Setback State encoding¶
Setback State		Description
Hexadecimal	Decimal	Description
0x80 … 0xFF 0x00 0x01 … 0x78	-128 … -1 0 1 … 120	The setback in 1/10 degrees (Kelvin) Example: 0 = 0 degrees setback 1 = 0.1 degrees is added to the setpoint 2 = 0.2 degrees is added to the setpoint -1 = 0.1 degrees is subtracted from the setpoint -2 = 0.2 degrees is subtracted from the setpoint
0x79	121	Frost Protection
0x7A	122	Energy Saving Mode
0x7B-0x7E	123-126	Reserved
0x7F	127	Unused State

Reserved values MUST NOT be used by a sending node. Reserved values MUST be ignored by a receiving node.

When converting between Celsius and Fahrenheit proper rounding MUST be applied with at least two decimals in the internal calculations of a device to avoid rounding errors.

Note

The implementation of Energy Saving Mode is manufacturer specific, and MUST be documented in the User’s Manual.

If the device is set to an unreachable state, the device SHOULD assume the closest possible state.

2.2.115.2. Thermostat Setback Get Command¶

This command is used to request the current state of the thermostat.

The Thermostat Setback Report Command MUST be returned in response to this command.

This command MUST NOT be issued via multicast addressing.

A receiving node MUST NOT return a response if this command is received via multicast addressing. The Z-Wave Multicast frame, the broadcast NodeID and the Multi Channel multi-End Point destination are all considered multicast addressing methods.

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Command Class = COMMAND_CLASS_THERMOSTAT_SETBACK (0x47)
Command = THERMOSTAT_SETBACK_GET (0x02)

2.2.115.3. Thermostat Setback Report Command¶

This command is used to report the current state of the thermostat.

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Command Class = COMMAND_CLASS_THERMOSTAT_SETBACK (0x47)
Command = THERMOSTAT_SETBACK_REPORT (0x03)
Reserved						Setback Type
Setback State

Setback Type (2 bits)

Refer to description under Thermostat Setback Set Command.

Setback State (8 bits)

Refer to description under Thermostat Setback Set Command.