A modular signal interface system for providing electrical communication with a surgical instrument when the surgical instrument is inserted into a cannula of a trocar. The system includes a signal interface adapter and an instrument connector. The signal interface adapter is provided on, or adapted to be mounted on a trocar, and includes central aperture extending therethrough and a proximal face having a plurality of conductive contacts. The instrument connector is provided on or adapted to be mounted on a shaft of a surgical instrument, and includes a central aperture extending therethrough and a distal face having a plurality of conductive contacts. The signal interface adapter and the instrument connector are adapted for mating engagement such that, when matingly engaged, their central apertures are axially aligned and predetermined ones of the plurality of contacts of the signal interface adapter are in conductive contact with predetermined ones of the plurality of contacts of the instrument connector.一種模組化信號介面系統和能量穿刺器，包括：安裝在穿刺器上的介面轉換器，具有中心孔和導電觸點；以及安裝在外科手術器械軸上的器械連接器，具有中心孔以及導電觸點，器械連接器提供與外科手術器械之間的電通信；介面轉換器與器械連接器能夠彼此配合，使得介面轉換器上的導電觸點與器械連接器上的導電觸點電性連接。
