| Byte / Bit # | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| HB0 | Packet Type = 0x81 | |||||||
| HB1 | Version = 1 | |||||||
| HB2 | 0 | 0 | 0 | Length = 27 | ||||
| PB0 | Checksum | |||||||
| PB1 | IEEE OUI Third Octet = 0x49 | |||||||
| PB2 | IEEE OUI Second Octet = 0x31 | |||||||
| PB3 | IEEE OUI First Octet = 0xF4 | |||||||
| PB4 | Vendor Type = 0x02 (FX-Direct) | |||||||
| PB5 | I 1 | R 2 | M 3 | AR 4 | 0 | 0 | 0 | |
| PB6 | DE Offset 5 Top (LSB) | |||||||
| PB7 | DE Offset 5 Top (MSB) | |||||||
| PB8 | DE Offset 5 Bottom (LSB) | |||||||
| PB9 | DE Offset 5 Bottom (MSB) | |||||||
| PB10 | DE Offset 6 Left (LSB) | |||||||
| PB11 | DE Offset 6 Left (MSB) | |||||||
| PB12 | DE Offset 6 Right (LSB) | |||||||
| PB13 | DE Offset 6 Right (MSB) | |||||||
| PB14 | Prescale 7 Horizontal | |||||||
| PB14 | Prescale 7 Vertical | |||||||
| PB15 | AR Numerator 8 (LSB) | |||||||
| PB16 | AR Numerator 8 (MSB) | |||||||
| PB17 | AR Denominator 8 (LSB) | |||||||
| PB18 | AR Denominator 8 (MSB) | |||||||
| PB19 ... PB27 |
0x00 (reserved) | |||||||
| Annotations | |||||||||
| 1 I |
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| 2 R |
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| 3 M |
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| 4 AR |
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| 5 DE Offset (vertical) | Raw line count (no pixel repetition applied) relative to the transport frame vertical DE start. |
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| 6 DE Offset (horizontal) | Raw pixel count (no pixel repetition applied) relative to the transport frame horizontal DE start. |
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| 7 Prescale | Prescale factor to apply (horizontal / vertical respectively) |
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| 8 Aspect Ratio | Source aspect ratio (numerator / denominator) value to apply according to Aspect Ratio Mode 4 (horizontal / vertical respectively) In case AR mode is not set, the aspect ratio to apply is auto-mapped from input width and height |
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