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Add byte 8 of 0xCD "tonnage" #20

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Add byte 8 of 0xCD "tonnage" #20

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73cef9e
Add byte 8 of 0xCD "tonnage"
nraynaud Aug 6, 2026
a224b31
Update 0xCD tonnage
nraynaud Aug 6, 2026
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22 changes: 18 additions & 4 deletions docs/developer/it-protocol/0x7B-identify-response/0xCD-unknown-identify-packet.md
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Expand Up @@ -7,10 +7,24 @@ The exact purpose of this packet and when (if at all) it's sent in the field is
:::


| Byte | Purpose | Possible Values | Supported by mUART | Notes |
|------|-------------------|-----------------|--------------------|-------|
| 0 | CommandType | 0xCD | | |
| 1-15 | Unknown | 0x03 | | |
| Byte | Purpose | Possible Values | Supported by mUART | Notes |
|-------|-------------------|-----------------|--------------------|-------|
| 0 | CommandType | 0xCD | | |
| 1-8 | Unknown | 0x03 | | |
| 9 | Tonnage? | 0x0-0x0 | | |
| 10-15 | Unknown | 0x03 | | |

## Byte 9 Tonnage

| Hex Flag (Byte 9) | Metric Capacity Class | Equivalent BTU Tonnage | Common Model Match Examples |
| :--- | :--- | :--- | :--- |
| **`0x00`** | 1.5 kW | ~5,000 BTU (0.42 Tons) | MSZ-AP15VGK, MSZ-EF15VG |
| **`0x01`** | 1.8 kW | ~6,000 BTU (0.50 Tons) | MSZ-AP18VGK |
| **`0x02`** | 2.0 kW | ~7,000 BTU (0.58 Tons) | MSZ-AP20VG, MSZ-LN20VG |
| **`0x03`** | 2.5 kW | ~9,000 BTU (0.75 Tons) | MSZ-AP25VG, MSZ-LN25VG, MSZ-EF25VG |
| **`0x04`** | 3.5 kW | ~12,000 BTU (1.00 Ton) | MSZ-AP35VG, MSZ-LN35VG, MSZ-EF35VG |
| **`0x05`** | 4.2 kW | ~15,000 BTU (1.25 Tons) | MSZ-AP42VG |
| **`0x06`** | 5.0 kW | ~18,000 BTU (1.50 Tons) | MSZ-AP50VG, MSZ-LN50VG |

### Sample Packets

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