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US 2012/0243620 A1Published application
Method and apparatus for digital data transmission
AssigneeAgie Charmilles SA
InventorsErnst Buehler, Reto Knaak, Rino D'Amario
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AssigneeAgie Charmilles SA
InventorsErnst Buehler, Reto Knaak, Rino D'Amario
Estimating the term…
An expansion of known serial data links, for example ETHERNET, published in IEEE802.3, for directly transmitting random events without having to carry out synchronization with a clock signal or having to wait for a cyclical transmission time. Two different, random events are represented using two differently coded individual pulses and are transmitted in an event-controlled manner. A jitter-free latency of 45 ns between the event and its reception is possible over a line length of 8 m, for example. The expansion is particularly suitable for the short, digital data links between a node and a plurality of modules, as are required in modern electrical discharge machines, machine tools and similar electronic systems.
Method for digital data transmission of stochastic events in a machine tool via a data cable (6, LINK) having a plurality of twisted conductor pairs (UP_LINK, DOWN_LINK), at least one conductor pair of which is intended for serial data transfer, characterized in that at least one further conductor pair (A_LINK, B_LINK) is intended to transmit stochastic events, and in that a stochastic event is signalled by an individual pulse (30) transmitted without a clock, the individual pulse being able to be a positive pulse or a negative pulse, and a positive pulse signalling a first stochastic event, a negative pulse signalling a second stochastic event and the absence of an individual pulse signalling no event.
Apparatus for digital data transmission of stochastic events in a machine tool via a data cable (6) having a plurality of twisted conductor pairs, at least one conductor pair (UP_LINK, DOWN_LINK) of which is intended for serial data transfer, characterized in that at least one further conductor pair (A_LINK, B_LINK) is intended to transmit stochastic events, a transmitting device (22, 23) being provided and coupled at least at one end of the data cable and a receiving device (24, 25) being provided and coupled at an opposite end of the data cable (6), which transmitting and receiving devices are connected to associated logic circuits (11, FPGA_N, 12, FPGA_M), and, for signalling stochastic events, the at least one transmitting device (22, 23) is designed in such a manner that it transmits individual pulses without a clock, an individual pulse being able to be a positive pulse or a negative pulse, and a positive pulse signalling a first stochastic event, a negative pulse signalling a second stochastic event and the absence of an individual pulse signalling no event, and the at least one receiving device (24, 25) for receiving the individual pulses is designed in such a manner that it can detect the three states “positive pulse”, “negative pulse” and “no event”.
Electrical discharge machine comprising:
Dependencies are inferred from the claim text.