Patent ID: 8520705

Claim:
A device for serial data transmission between a control unit and a position-measuring device, comprising an interface unit on a control side and an interface unit on a measuring-device side, the interface units being connected to each other for transmission of serial data packets by a bidirectional data channel; a control-side transmitter unit, arranged in the interface unit on the control side, adapted to transmit serial data packets via the data channel to a measuring-device-side receiver unit arranged in the interface unit on the measuring-device side; a measuring-device-side transmitter unit, arranged in the interface unit on the measuring-device side, adapted to transmit serial data packets by the data channel to a control-side receiver unit arranged in the interface unit on the control side; wherein the control-side transmitter unit is adapted to transmit data packets that include a clock sequence at a beginning, a frequency of a control-side transmitter clock signal underlying the transmission being derivable from a time characteristic of the clock sequence; and wherein the receiver unit on the measuring-device side includes a measuring-device-side clock-recognition unit adapted to evaluate the clock sequence and, in order to read in control-side output data included in the data packet, to generate a measuring-device-side receiver clock signal having a frequency that substantially corresponds to the frequency of the control-side transmitter clock signal.