The following figure shows details of the radiosonde additional interface connector. See also the following table for details on the RS41 electrical interface and the additional sensor.
| Radiosonde | Additional sensor | ||||
|---|---|---|---|---|---|
| Pin | Name | I/O | Function | Pin | Name |
| 1 | GND | - | Ground | Common | |
| 2 | RxD | I | Serial data from the additional sensor | Instrument Serial out | |
| 3 | TxD | O | Serial data to the additional sensor | Instrument Serial in | |
| 4–10 | Reserved | For Vaisala use only | Do not connect | ||