Timberline 1.0

This document describes the Timberline hydronic heating and climate control system RV-C implementation used with Timberline 1.0.

System Overview

• Manufacturer: Timberline
• System Type: Multi-function hydronic heating and climate control
• RV-C Source Address: 0x65 (101 decimal)
• Default Source Address (DSA): 101 (Water Heater)

System Components

The Timberline system integrates multiple climate control functions:

• Water Heater - Hydronic hot water heating
• Circulation Pump - Hot water recirculation for instant hot water
• Furnace - Space heating
• Thermostat - Multi-zone climate control
• Temperature Sensors - Ambient temperature monitoring

RV-C Message Summary

The following DGNs (Data Group Numbers) are used by the Timberline system:

Message Decoding Details

DM_RV - Diagnostic Message (0x1FECA)

Purpose: Reports system health and operating status

Example Message:

<0x19feca65> [8] 01 65 ff ff ff ff ff ff

Decoded:

• Byte 0: 0x01 = Status bits
  • Bits 0-1: Operating status = 01b = ON
  • Bits 2-3: Operating mode = 00b = Standby
  • Bits 4-5: Yellow lamp (warning) = 00b = No warning
  • Bits 6-7: Red lamp (fault) = 00b = No fault
• Byte 1: 0x65 = DSA (Default Source Address) = 101 (Water Heater)
• Bytes 2-7: 0xFF = No active faults

Interpretation: System is enabled but in standby mode, with no faults or warnings.

WATERHEATER_STATUS (0x1FFF7)

Purpose: Water heater operating mode, temperatures, and burner status

Example Message:

<0x19fff765> [8] 01 00 60 2d a3 24 c3 00

Decoded:

• Byte 0: 0x01 = Instance 1 (Water heater 1)
• Byte 1: 0x00 = Operating mode = OFF
  • 0 = Off
  • 1 = Combustion
  • 2 = Electric
  • 3 = Gas/Electric (both)
  • 4 = Automatic
• Bytes 2-3: 0x2D60 (little-endian) = Set point temperature
  • Raw value: 11616
  • Formula: (value × 0.03125) - 273
  • Temperature: 90°C (194°F)
• Bytes 4-5: 0x24A3 = Current water temperature
  • Raw value: 9379
  • Temperature: 20.2°C (68.4°F)
• Byte 6: 0xC3 = Status bits
  • Bits 0-1: Thermostat status = 11b (invalid/error)
  • Bits 2-3: Burner status = 00b = Off
  • Bits 4-5: AC element status = 00b = Inactive
  • Bits 6-7: High temp limit = 11b (invalid/error)
• Byte 7: 0x00 = Status bits
  • Bits 0-1: Failure to ignite = 00b = No failure
  • Bits 2-3: AC power = 00b = AC power present
  • Bits 4-5: DC power = 00b = DC power present
  • Bits 6-7: DC power warning = 00b = DC power sufficient

Interpretation: Water heater is OFF, configured for 90°C target temperature, current water temperature is 20.2°C. All power sources are healthy.

THERMOSTAT_AMBIENT_STATUS (0x1FF9C)

Purpose: Ambient temperature readings for climate zones

Example Message:

<0x19ff9c65> [8] 01 9c 23 ff ff ff ff ff

Decoded:

• Byte 0: 0x01 = Instance 1 (Zone 1)
• Bytes 1-2: 0x239C = Ambient temperature
  • Raw value: 9116
  • Formula: (value × 0.03125) - 273
  • Temperature: 12.0°C (53.6°F)
• Bytes 3-7: 0xFF = Not available

Interpretation: Zone 1 ambient temperature is 12.0°C.

THERMOSTAT_STATUS_1 (0x1FFE2)

Purpose: Thermostat operating mode, fan mode, and temperature setpoints

Example Message:

<0x19ffe265> [8] 01 30 ff 60 25 ff ff ff

Decoded:

• Byte 0: 0x01 = Instance 1 (Zone 1)
• Byte 1: 0x30 = 0b00110000
  • Bits 0-3: Operating mode = 0000b = Off
    • 0000b = Off
    • 0001b = Cool
    • 0010b = Heat
    • 0011b = Auto heat/cool
    • 0100b = Fan only
    • 0101b = Aux heat
  • Bits 4-5: Fan mode = 11b (invalid - should be 00b or 01b)
  • Bits 6-7: Schedule mode = 00b = Disabled
• Byte 2: 0xFF = Fan speed = Auto/Not available
• Bytes 3-4: 0x2560 = Heat setpoint temperature
  • Raw value: 9568
  • Temperature: 26°C (78.8°F)
• Bytes 5-6: 0xFFFF = Cool setpoint = Not available

Interpretation: Thermostat zone 1 is OFF, with heating setpoint configured for 26°C. No cooling setpoint configured.

FURNACE_STATUS (0x1FFE4)

Purpose: Furnace operating mode, heat source, and fan speed

Example Message:

<0x19ffe465> [8] 01 fc 00 ff ff ff ff ff

Decoded:

• Byte 0: 0x01 = Instance 1 (Furnace 1)
• Byte 1: 0xFC = 0b11111100
  • Bits 0-1: Operating mode = 00b = Automatic
  • Bits 2-7: Heat source = 111111b = Data not available
• Byte 2: 0x00 = Circulation fan speed = 0% (off)
• Bytes 3-7: 0xFF = Not available

Interpretation: Furnace is in automatic mode but currently inactive with fan off.

CIRCULATION_PUMP_STATUS (0x1FE97)

Purpose: Hot water circulation pump operating status and diagnostics

Example Message:

<0x19fe9765> [8] 01 f0 ff ff ff ff ff ff

Decoded:

• Byte 0: 0x01 = Instance 1 (Pump 1)
• Byte 1: 0xF0 = 0b11110000
  • Bits 0-3: Output status = 0000b = OFF
    • 0000b = Off
    • 0001b = On
    • 0101b = Test (forced on)
• Byte 2: 0xFF = Status bits (not available when pump is off)
  • Bits 0-1: Pump overcurrent status
  • Bits 2-3: Pump undercurrent status
  • Bits 4-5: Pump temperature status

Interpretation: Circulation pump is OFF. Diagnostic status not available (normal when pump is not running).

Temperature Conversion Formula

All RV-C temperature values use the following encoding:

Formula: Temperature (°C) = (raw_value × 0.03125) - 273

Precision: 0.03125°C (1/32°C) Range: -273°C to 1735°C Special Values:

• 0xFFFF = Data not available
• 0xFFFE = Error/out of range

Example Conversions:

Command Messages

To control the Timberline system, implement these command DGNs:

• WATERHEATER_COMMAND (0x1FFF6) - Control water heater mode
• THERMOSTAT_COMMAND_1 (0x1FEF9) - Set thermostat mode and setpoints
• FURNACE_COMMAND (0x1FFE3) - Control furnace
• CIRCULATION_PUMP_COMMAND (0x1FE96) - Control circulation pump

References

• RV-C Specification - Official RV-C protocol documentation
• RV-C Specification Full Layer - Section 3.2.6 (Proprietary Messages)
• RV-C Specification Full Layer - Section 6.9 (Water Heater)
• RV-C Specification Full Layer - Section 6.15 (Furnace)
• RV-C Specification Full Layer - Section 6.16 (Thermostat)