Method and arrangement for transmitting data, especially in an aircraft

Claim 1

A method for time-division multiplex transmission of data, in digital form, in a serial data bus system, with varying signals being possible; the bus system includes a central unit, several equivalent subscribing stations which are provided with individual addresses and which are subordinate to said central unit, and at least one bus line or data bus, which connects all of said stations, whereby time slots are alloted or taken away from the stations by said central unit in a predetermined manner and data transmission transpires in different phases subject to employment of normal request techniques; said method comprises the steps of carrying out the following transmission phases: undergoing an initiation phase, in which said central unit accordingly determines and acertains number of said stations participating and accordingly allocates to each ascertained station a fixed predetermined time slot for the request phase as to said stations participating; proceeding with said request phase, in which the individual stations request a time slot from said central unit for purposes of a required bus access, with each station then accordingly having its predetermined fixed time slot; continuing in an allocation phase, in which said central unit allocates to each of said stations a time slot in response to request therefor; obtaining a data phase, in which the data is transmitted; and providing, in each of said data phases, for the signalling of bus requests, a time slot in which at least one preferred station can emit a request pulse which causes said central unit, after completion of this data phase, to go on proceeding to carry out immediately thereafter the request phase and assuring that the requesting station receives a time slot in the new bus allocation.

Claim 2

A method for time-division multiplex transmission of data, in digital form, in a serial data bus system, with varying signals being possible; the bus system includes a central unit, several equivalent subscribing stations which are provided with individual addresses and which are subordinate to said central unit, and at least one bus line or data bus, which connects all of said stations, whereby time slots are alloted or taken away from the stations by said central unit in a predetermined manner and data transmission transpires in different phases subject to employment of normal request techniques; said method comprises the steps of carrying out the following transmission phases: undergoing an initiation phase, in which said central unit accordingly determines and acertains number of said stations participating and accordingly allocates to each ascertained station a fixed predetermined time slot for the request phase as to said stations participating; proceeding with said request phase, in which the individual stations request a time slot from said central unit for purposes of a required bus access, with each station then accordingly having its predetermined fixed time slot; continuing in an allocation phase, in which said central unit allocates to each of said stations a time slot in response to request therefor; obtaining a data phase, in which the data is transmitted; and providing, in each of said data phases, for the signalling of bus requests, a time slot in which at least one preferred station can emit a request pulse which causes said central unit, after completion of this data phase, to go on proceeding to carry out immediately thereafter the request phase and assuring that the requesting station receives a time slot in the new bus allocation.