The luminosity monitor of the CMD-2 detector consists of two identical full absorption counters based on BGO crystals with phototriode light readout. Double bremsstrahlung events are used for the luminosity measurement. In compliance with the requirements of chosen luminosity measurement method, custom electronics has been designed and built. During exploitation the electronics proved to have the design parameters. The reliability and long-term stability of the monitor's electronics make the monitor useful and easy-in-use instrument.