Logical zones grouped by device function for D-302. Physical detection-zone boundaries (Clause 13) are defined on the as-designed drawing.
| Optical Smoke | 44 |
| Multi-sensor | 8 |
| Zone total | 52 |
| Manual Call Point | 6 |
| Zone total | 6 |
| Sounder + VAD | 10 |
| Zone total | 10 |
| I/O Interface | 3 |
| Zone total | 3 |