| half cycle following DCC message | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Message Type | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Normal | x | x | x | x | ||||||||||||||||||
| Alarm | x | x | x | x | ||||||||||||||||||
| DH142 readback | x | x | x | x | x | x | x | x | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||||||
| DH163 readback | x | x | x | x | ||||||||||||||||||
| Nibble value |
7 13 19 |
8 14 20 |
9 15 21 |
10 16 22 |
11 17 23 |
12 18 24 |
octal value | check digit |
|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 1 | 1 | 0 | 1 | 15 | 1 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 25 | 0 |
| 2 | 1 | 0 | 0 | 1 | 0 | 1 | 45 | 1 |
| 3 | 1 | 1 | 1 | 0 | 0 | 0 | 70 | 1 |
| 4 | 1 | 1 | 0 | 0 | 0 | 1 | 61 | 0 |
| 5 | 1 | 0 | 1 | 0 | 0 | 1 | 51 | 1 |
| 6 | 0 | 1 | 1 | 0 | 0 | 1 | 31 | 0 |
| 7 | 1 | 1 | 0 | 0 | 1 | 0 | 62 | 0 |
| 8 | 1 | 0 | 1 | 0 | 1 | 0 | 52 | 1 |
| 9 | 0 | 1 | 1 | 0 | 1 | 0 | 32 | 0 |
| A | 0 | 0 | 1 | 0 | 1 | 1 | 13 | 0 |
| B | 0 | 1 | 0 | 0 | 1 | 1 | 23 | 1 |
| C | 1 | 0 | 0 | 0 | 1 | 1 | 43 | 0 |
| D | 1 | 1 | 0 | 1 | 0 | 0 | 64 | 1 |
| E | 1 | 0 | 1 | 1 | 0 | 0 | 54 | 0 |
| F | 0 | 1 | 1 | 1 | 0 | 0 | 34 | 1 |