Boots – shoes – and leggings
Patent
1993-02-17
1995-08-29
Harvey, Jack B.
Boots, shoes, and leggings
364DIG1, 3642382, 3642385, 364240, G06F 1300
Patent
active
054468469
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a distributed computer system arrangement with master units and slave units which communicate with one another via a serial bus connection and in which the slave units can be connected to the connection via connecting devices and on their respective connection can be assigned identifications in the system.
Systems with parallel-connected multiprocessors which operate in real time are already known. As an example of such a system, the TRAINET system can be mentioned, which is offered on the open market by KVASER, Kinna, Sweden. Another system is constituted by the CAN system which operates with prioritised messages. Through the former system, it is already known to arrange module units which can be connected to the bus connection(s) in question. For establishing the identification of each connected module unit, use has thus far been made of mechanical switches (DIP switches) or binary codes which have been arranged in or at the connecting devices. By adjustment of said switches or introduction of said binary codes, a higher-level unit (master unit) in the system can assign the connected module a number in the loop connection in question.
There is, however, a requirement that the system can be given a structure which makes possible a categorisation from the point of view of the designer. Systems of this type are relatively complex and there is a marked requirement to separate, for example, the work of the system builder from the work of the module manufacturer. Intimate cooperation has thus far been necessary between said two categories, which has, for example, meant that the module manufacturer has had to have great knowledge of the communication system as such. The system builder has in turn been compelled to go into detailed designs which can be related to the structure of the module units. There is thus a requirement to arrange an interface/a barrier between the communication functions and the module functions.
SUMMARY OF THE INVENTION
The aim of the present invention is inter alia to solve this problem.
It is possible to carry out the arrangement of an interface or a barrier so that the computer system is capable of accomplishing its tasks and functioning without interference from the barrier. It is thus possible, for example, for the higher-level unit (the master) to reconfigure the whole system with the aid of software changes. It is also possible, for example, to carry out the numbering and/or renumbering of the modules in a simple manner by means of digital communication with the invention. As far as connecting functions in systems of this type are concerned, it is a generally known fact that the costs for such connectors are high. It is therefore of important to bring down the number of connecting conductors in the connecting device which the invention also provides. It is of interest as far as the builder of the module units is concerned to be able to make long production runs with a few model versions. The module manufacturer is able to build his modules starting from performance information from the system builder. The system builder is in turn able to build the system without assistance from the module manufacturer because the invention solves this problem.
The system builder is, for example, to be able to decide whether he wants an electrically isolated contact in the connecting device or not without assistance from the module manufacturer. He can choose between optical and/or electrical transfer media. The latter will in turn need not consider the question of whether or not there is to be an electrical contact in the connecting device.
What can be considered to be characteristic of the new arrangement is that the identification of the module units in the system can be effected by means of memory members and/or microprocessor members which are arranged in each control device or associated each control device. As an alternative or complement to a microprocessor, an advanced logic circuit can be used. In one embodiment information in, the memory member and/or
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Harvey Jack B.
Sheikh Ayaz R.
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