In a device and a method for monitoring a clock signal of a position measuring device, which is connected to sequential electronics via a data transmission channel, and the data transmission channel has a data line, via which data signals are transmittable from an interface unit of the position measuring device to an interface unit of the sequential electronics, the interface unit of the position measuring device including a pulse generation unit, by which a test pulse is able to be generated based on the time pattern of the clock signal, and is transmittable via the data line to the interface unit of the sequential electronics. The interface unit of the sequential electronics includes a pulse measuring unit, by which a pulse duration of the test pulse in the time pattern of a clock signal of the sequential electronics is measurable in a functionally reliable manner and by which a measured value representing the pulse duration is able to be output to a control unit for analysis.