1. A device for transmitting data between a position-measuring device and sequential electronics via a data-transmission channel, comprising: an interface unit and a processing unit included in the position-measuring device, the interface unit connected to the data-transmission channel and to the processing unit for an internal data exchange by a request channel and a response channel, the interface unit including a command interpreter adapted to convert, in accordance with conversion rules, commands that arrive via the data-transmission channel into internal requests and to feed via the request channel to the processing unit, the interface unit adapted to convert response data that arrives from the processing unit via the response channel into output data, the interface unit including a rules memory adapted to store the conversion rules, the conversion rules in the rules memory being at least partially modifiable.