Abstract: For the transmission of data between a terminal device, which preferably comprises a personal computer, and a remote subscriber via a transmission link, in particular a teleprinter line, a transmission unit is arranged between the terminal device and the transmission link. The printer of the terminal device is also connected to the transmission unit. In addition to a transmitting/receiving unit, the transmission unit contains a control unit which is provided with a transfer device in order that the printer, as an output unit, can be supplied even with the data emitted from the terminal device in a local operating mode or with data transmitted via the transmission link. The control unit can additionally contain storage units and code converters.