Gillham code
Gillham code is a zero-padded 12-bit binary code using a parallel nine- to eleven-wire interface, the Gillham interface, that is used to transmit uncorrected barometric altitude between an encoding altimeter or analog air data computer and a digital transponder. It is a modified form of a Gray code and is sometimes referred to simply as a "Gray code" in avionics literature.
| Gillham code | |
|---|---|
| Digits | 12 |
| Tracks | 9..11 |
| Continuity | no |
| Cyclic | yes |
| Minimum distance | 1 |
| Maximum distance | 1 |
| Lexicography | no |
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