| 摘要 |
A device for the serial transmission of data between at least two terminals which are interconnected via a two-wire line. Each terminal has a bus-coupling circuit having at least one transmitting section or one receiving section. The transmitting section has at least two driver circuits which are each connected to one line of the two-wire line. A resistor network is switched between each driver circuit and line. During a data transmission, the transmitting section transmits complementary signals to the lines. The receiving section has a comparator which is connected at its one input to a line of the two-wire line and which is supplied at its second input with a specific reference potential. The output signals from the comparators are evaluated by an evaluation circuit. The reference potentials of the comparators and the resistor networks are designed to allow both comparators to emit a switching signal, in dependence upon the transmitted bit conditions, in the case of an error-free operation. The reference potentials and the resistor networks are designed to allow one of the comparators to emit a switching signal, in dependence upon the transmitted bit conditions, and to allow the other comparator to remain in one of the two circuit states, in the case of a short-circuit of one of the lines to any voltage potential whatsoever or in the case of a short-circuit of the lines between themselves.
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