The IMser serial interface module provides data communication with the tightening system via an RS232 / RS422 or 20 mA interface. Any one of these three physical interfaces can be used. The IMser is inserted into a slot on the KE350 or KE350G IL communication unit or the SE352M control unit. The interface module is designed for data input or output. Various print formats are available for connection to a data printer. In addition, bidirectional data communication can be activated via protocol 3964R / RK512.