Device and method for serial data transmission between a position-measuring device and a control unit

A method for serial data transmission between a position-measuring device and a control unit, including a device having:

• an interface unit on a control side and an interface unit on a measuring-device side, the control units 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 by the data channel to a measuring-device-side receiver unit arranged in the interface unit on the measuring-device side;
• and 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, comprising:
• transmitting control-side output data by a data packet by the transmitter unit on the control side via the data channel to the receiver unit on the measuring-device side in accordance with a time clock of a control-side transmitter clock signal, the data packet including a clock sequence at a beginning, a frequency of the control-side transmitter clock signal derivable from a time characteristic of the clock sequence;
• evaluating the clock sequence and generating a measuring-device-side receiver clock signal having a frequency that substantially corresponds to the frequency of the control-side transmitter clock signal, in a measuring-device-side clock-recognition unit arranged in the receiver unit on the measuring-device side;
• reading in of control-side output data, included in the data packet, as measuring-device-side input data in the time clock of the receiver clock signal on the measuring-device side.