Table 5-3. 9 way male 'D' connector
| pin | function |
|---|
| 1 | Audio out. (Amplified Doppler shift signal, can be used to drive external audio amplifier). |
| 2 | Spare digital IO. |
| 3 | Analogue input 1. |
| 4 | signal ground. |
| 5 | Analogue input 2 |
| 6 | Analogue input 3 |
| 7 | Analogue input 4 |
| 8 | Analogue input 5 |
| 9 | Reserved. Do not connect. |