DE4422465A1 - Computer connection cable with integrated interface - Google Patents

Abstract

The computer connection cable is used for personal computers with a serial RS 232 interface, for connection to a further computer for data transfer between them. The interface uses a min. number of electronic components, e.g. a single IC and provides incorporated protection of the personal computer. The interface components and protection circuit are sized to allow their incorporation in a standard plug housing, without requiring an additional separate housing.

Description

It is known that different computers, even if they have have a communication interface, not always these can be connected directly to transfer data from one to the other transfer to another device.

Among other things, this can happen at non-standardized interfaces, There are connection points or levels of the data lines. To connect the two computers securely, then it is necessary that an electronic circuit (Interface) the differences between the two Compensates connections / interfaces and at the cable ends suitable connectors are attached.

For such an interface cable, a complex circuit (several electronic components) was previously necessary, which depending on the size was housed in an additional box ( Fig. 2).

Individual parts:
A connector to the computers
B cable
C box / housing with the circuit.

In addition, the interface circuit has so far consisted of more than an electronic component.

The invention specified in the claim lies Problem based on optimizing the expenditure on components (a electronic component = an IC) and the manufacture and the To simplify / improve the way the circuit works. The electronic circuit is in the connector on the PC side housed and the cable length is approx. 2,500 mm. (Can but can also be longer by using the IC. ) In addition, the small circuit size of the Interfaces a larger, additional housing than the necessary No connector housings.

Fig. 1: A connector to the PC with the circuit
B cable
C plug to chess computer.

Fig. 3 shows the construction plan of the new connection cable with only one electronic component.

A is the connection side to the PC and B is the connection side to the chess computer. The designations of the line ends correspond to the usual markings for the function of the individual interface lines and the digits additionally identify the connection pins of the interface Plug for PC (DB 9) and chess computer (5-pin DIN). The component (IC) with its type number (7416) and its Connections (numbered numbered) is in the usual connection Representation shown.

Instead of the IC with the type number 7416, relatives can also be used Types like 4049,. . . or the corresponding SMD types (e.g. TC4SU69F,. . .) Find use.

The IC (7416), as shown, enables  both the level conversion (inversion) required for a Data transmission is necessary as well as protection of the the computer connected to the PC (chess computer).

Protection is achieved because the sending and possibly damaged data line from PC to chess computer by the leads electronic component that only "compatible" (= harmless) forwards signals.

The circuit constructed in this way enables the electronic components in the connector - e.g. B. on the PC side - and a longer cable length than it has been built so far.

Fig. 4 shows the circuit diagram of the new connection cable with only one component. A is the connection side to the PC and B is the connection side to the chess computer. The designations of the cable ends correspond to the usual markings for the function of the individual interface cables and the numbers additionally identify the connection pins of the interface plugs for PC (DB 9) and chess computer (5-pin DIN).

Claims (3)

Computer connection cable with integrated interface (level converter) for PCs (IBM or compatible personal computers) with serial RS 232 interface for connecting PCs to corresponding computers (e.g. chess computers from Saitek) for data transmission purposes, characterized in that the interface has been reduced to a minimum of electronic components (an electronic component / IC) and at the same time there is protection for the connected computer by appropriate installation / connection of the component (detailed in the description). The size of the component and the circuit enables installation into existing and common (available) plugs (= installation in Connector housing) without an additional and therefore larger Box needed as a housing for the circuit. The manufacturing effort through this new type of circuit Construction was reduced to a minimum.