Method for serial transmission between a position measuring device and a processing unit
AssigneeDr. Johannes Heidenhain GmbH
InventorErwin Bratzdrum
Life of this patent
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Abstract
A system that includes a position measuring device, a processing unit, a first data channel connecting the position measuring device to the processing unit and for transmitting data from the position measuring device to the processing unit and a second data channel connecting the position measuring device to the processing unit and for transmitting data from the processing unit to the position measuring device. Serial data transmission between the position measuring device and the processing unit is based on ethernet physics, wherein it is assured that a pickup of position data in the position measuring device always takes place at defined times and with the least possible chronological inexactness.
Claims11
A method for serial data transmission between a position measuring device and a processing unit, comprising:
- transmitting data packets between a position measuring device and a processing unit during a set of use phases, wherein a set of idle phases during which no data are transmitted are interspersed so that an idle phase is located between successive ones of said set of use phases;
- wherein in case of an appearance of a position request command during one of said set of idle phases, said position request command is transmitted, together with a first delay information, to said position measuring device at an end of said one of said set of idle phases;
- and
- evaluating said first delay information by said position measuring device to the effect that a constant delay time always results between an appearance of said position request command at said processing unit and processing of said position request command at a processing unit of said position measuring device.
Dependencies are inferred from the claim text.