# Sensors' indexes

The S2 S2IOG2 node sends the readings using the following indexes.

<table><thead><tr><th width="138">Index</th><th>Sensor</th></tr></thead><tbody><tr><td>0</td><td>1-Wire Dallas sensor</td></tr><tr><td>1</td><td>Analogue/digital input 1</td></tr><tr><td>2</td><td>Analogue/digital input 2</td></tr><tr><td>3</td><td>Analogue/digital input 3</td></tr></tbody></table>