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SP80 interface socket (15W D socket)
The SP80 input connector is a low density 15-way D-type socket with the following pin-outs:

| UCC PI 80 pin no. | Function | SP80 pin no. |
|---|---|---|
| 1 | Cos Y | 5 |
| 2 | Reserved | 3 |
| 3 | Cos Z | 4 |
| 4 | 0 V | 2 |
| 5 | /Probe present/ (active low) | 9 |
| 6 | /Green LED off/ (active low) | 10 |
| 7 | Sin Z | 12 |
| 8 | Vref | 1 |
| 9 | Reserved | 15 |
| 10 | /Red LED on/ (active low) | 11 |
| 11 | Cos X | 6 |
| 12 | Sin X | 14 |
| 13 | Reserved | 8 |
| 14 | Sin Y | 13 |
| 15 | Probe power +15 V | 7 |
| Shell | Screen | Shell |