Device and process for acquisition of measurements using a digital communication bus, particularly used during aircraft tests
First Claim
1. Process for the acquisition of measurements using a digital communication bus (10) composed of a cable with a first and a second shielded twisted pair of lines, said first pair of lines used for exchanging data between a bus arbitrator and a slave equipment, said second pair of lines for transporting data validation clock, the shielding of this cable being continuous throughout its length, and a computer system comprising a bus arbitrator (11) connected to the communication bus (10) which acts as bus master and which synchronizes measurements made using sensors (14), pull-up and pull-down resistances at said bus arbitrator (11), and several items of slave equipment (13) connected to the communication bus (10) to which these sensors are connected, the process comprising:
- acquiring measurements from sensors (14) through the slave equipment (13) using a cyclic exchange of variable with the bus arbitrator (11), wherein the bus arbitrator (11) comprises a scanning table composed of an ordered sequence of identifiers of variables to be queried during an elementary data scanning cycle.
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Abstract
The invention relates to a device for acquisition of measurements using a digital communication bus (10) and a computer system, comprising:
a bus arbitrator (11) connected to this bus (10), with the function of acting as the bus master and which synchronizes measurements made using sensors (14), several items of slave equipment (13) connected on this bus (10), to which these sensors (14) are connected, two line termination devices; the first being integrated in the bus arbitrator (11) and the second being integrated into slave equipment (13) at the other end of the bus (10) opposite the bus arbitrator (11). The invention also relates to a measurement acquisition process.
21 Citations
12 Claims
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1. Process for the acquisition of measurements using a digital communication bus (10) composed of a cable with a first and a second shielded twisted pair of lines, said first pair of lines used for exchanging data between a bus arbitrator and a slave equipment, said second pair of lines for transporting data validation clock, the shielding of this cable being continuous throughout its length, and a computer system comprising a bus arbitrator (11) connected to the communication bus (10) which acts as bus master and which synchronizes measurements made using sensors (14), pull-up and pull-down resistances at said bus arbitrator (11), and several items of slave equipment (13) connected to the communication bus (10) to which these sensors are connected, the process comprising:
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acquiring measurements from sensors (14) through the slave equipment (13) using a cyclic exchange of variable with the bus arbitrator (11), wherein the bus arbitrator (11) comprises a scanning table composed of an ordered sequence of identifiers of variables to be queried during an elementary data scanning cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification