You can get data messages with the aR4 command.
An example response:
0R4,Tr=111.3C,Ra=0.0M,Sl=0.001208V,Sr=0.000029V
| Tr | Pt1000 (C = Celsius, F = Fahrenheit) |
| Ra | Aux rain accumulation (M = mm) |
| Sl | Ultrasonic level sensor (V = volts at input * gain) |
| Sr | Solar radiation (V = volts at input * gain) |
You can set the gain for Sr and Sl.