The CNAP (Noninvasive Arterial Blood Pressure) monitor is a non-invasive monitoring system that measures all relevant pulmonary parameters and the volume status of the person involved continuously and in real time. The areas of application reach from anaesthetics, intermediate care, and emergency medicine to electro-physiology and research. Thanks to its easy use, the system is ready for use within a few minutes, which improves monitoring of the patient in the operating room and contributes to and even replaces some conventional standards with valuable information. The CNAP monitor including measuring unit is provided by CNSystems, although MEDS was assigned to the individual electronic design areas. Over the course of further development activities, the system was revised with regard to data transmission.