Boots – shoes – and leggings
Patent
1994-08-15
1996-04-02
Ruggiero, Joseph
Boots, shoes, and leggings
364138, 364DIG2, 3649294, 3649295, 395822, 395829, G05B 19042, G06F 900
Patent
active
055046711
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a control system comprising a motherboard having at least two auxiliary card connectors and a control bus on which control addresses and control data are transferred, and at least one auxiliary card connected to one of the auxiliary card connectors, the auxiliary card having a control address for selective controlling through the control bus.
BACKGROUND OF THE INVENTION
In various kinds of control systems a master unit typically controls slave units via a common control bus. Each control unit connected to the bus has a control address (identifier) for identifying the commands addressed to it from among the commands given on the common bus. In a module or circuit card implementing the slave unit, the control address is made by a fixed wiring, or the address can be set, e.g., by switches. Alternatively, every module or card may receive a dedicated control signal from the master unit. A drawback in this known solution is that with otherwise identical cards, it is necessary to know the address set or to be set for each card. The modules and cards used are thus different in respect of production, selling, installation or maintenance, and their installation requires specific settings or tuning.
SUMMARY OF THE INVENTION
The object of the invention is to provide a control system in which the above problems are eliminated.
This is achieved with a control system of the type described in the first paragraph, the system according to the invention being characterised in that the control address is card location-specific and the control address of the auxiliary card is not determined until the auxiliary card is connected to an auxiliary card connector, and that the motherboard comprises means connected to the auxiliary card connectors for providing control address data of the card location through the auxiliary card connector to the auxiliary card.
In the present invention, the control addresses of the auxiliary cards are card connector-specific and they are set by wiring, by switches or in some other corresponding manner on the motherboard. When the auxiliary card is connected to the auxiliary card connector of the motherboard, the auxiliary card always obtains the correct address from the motherboard through the connector. On account of the invention, the user need not set the required address data separately, which facilitates assembling, testing, installation and maintenance. In addition, the auxiliary cards are identical; they do not have any differences, not even in control addresses, in respect of production, selling, installation or maintenance.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described by means of preferred embodiments, with reference to the attached drawing, wherein
FIG. 1 shows a block diagram of a control system implemented in accordance with the invention for controlling combiner filters at a base station,
FIG. 2 illustrates inputting of control address data from the motherboard through a connector to an auxiliary card.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
In principle, the present invention can be applied in any control equipment in which several identical auxiliary cards with different control addresses are to be connected to a motherboard or bus card comprising a common control bus. However, in the following, the invention will be exemplified by a control system which controls the combiner filters at a base station of a radio system. At the base station, several radio transmitters are connected to one antenna or antenna line so that each radio transmitter is connected through its own bandpass filter having a center frequency tuned to the transmission frequency of the radio transmitter. Bandpass filters of this kind are called combiner filters. A combiner filter supplies a transmission signal from the associated radio transmitter to the antenna with as low power losses as possible and, on the other hand, prevents--as effectively as possible--leakage of transmission signals generated by other ra
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Abstract of Japan: vol. 12, No. 245 (P-729) 63-37441: Feb. 1988.
Abstracts of Japan: vol. 12, No. 303 (P-746) 63-75850; Apr. 1988.
Nokia Telecommunications
Ruggiero Joseph
LandOfFree
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