FLIR Lepton 2.5 - Figure 32 - Packet Header Encoding and an Example

FLIR LEPTON® Engineering Datasheet
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Lepton Engineering Datasheet, Document Number: 500-0659-00-09 Rev: 203
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(b) Frame contents with telemetry enabled
As shown in Figure 32, the first bit of the ID field is always a zero. The next three bits are referred to as the TTT
bits, and the following 12 are the packet number. Note that packet numbers restart at 0 on each new segment.
For all but packet number 20, the TTT bits can be ignored. On packet 20, the TTT bits encode the segment
number (1, 2, 3, or 4). The encoded segment number can also have a value of zero. In this case the entire
segment is invalid data and should be discarded. Figure 32 also shows an example of Packet 20 of Segment 3.
Figure 32 - Packet Header Encoding and an Example
(a) Generic Encoding of the packet header