Multi-Function DG Set Data Logger measures and display of four operating parameters of the diesel engine and nineteen electrical parameters of the generator set. The Data Logger can record eight performance parameters at predetermined time interval and retention of 1000 sets of data in internal memory. The Data Logger is provided with communication port and appropriate software for accessing recorded data. Multi-Function DG Set Data Logger is based on the analog input and digital output and provides control for "start", "emergency stop" and "alarm" facility.