R-Log, when configured as Master, receives measurements via radio from the configured Slave and Repeater units. In this case R-Log Master stores all the measurements of the network. From a PC it is sufficient to connect only to the Master instrument in order to use all the data. The radio used is Zig-Bee type at 2.4 GHz (Tx 10 mV), this type of radio uses a free frequency everywhere. The distance covered is 300 m (line of sight).