The command is designed for reading of the current data: relative level, temperature, frequency.

The command is a sequence of symbols ASCII “D” and “O”. After receipt of the “DO” command the program will response in the form of ASCII symbols sequence.

For example, F=0AF9 t=1A N=03FF.0 <CR><LF>, where F is the current frequency value, t is the current value of temperature in Celcius degrees, N is the level value. All values are in hexadecimal form.

In case the frequency value exceeds FFFh, the data are considered invalid.