Today, connecting medical devices to the hospital network becomes a priority for many hospitals. User and operator requirements for communication must be considered in order to develop an adequate interoperable integration approach. This paper conducts a requirement study using questionnaires and working groups investigating 16 clinical communication requirements for connecting medical devices with each other and with clinical IT systems. Six German Hospitals order the communication requirements by their clinical relevance and categorize those into four main clusters. Communication requirements regarding accurate data transfer and processing for patients and devices have top priority, while communication requirements regarding remote manipulation of medical devices have low rank. Connecting medical devices to clinical IT systems improves clinical documentation and with it patient care processes.