| 摘要 |
The invention relates to a device (13) for connecting a subscriber (8) to a bus line (11) for the bi-directional transmission of data. The subscriber (8) is connected via a branch line (12) to the device (13). The branch line (12) is, from the standpoint of line technology, decoupled from the bus line (11) by means of an amplifier circuit (15,16), so that no reflections or interferences are coupled into the bus line (11), which would otherwise occur through the connection of the subscriber (8). Preferably, the subscriber (8) supplies the power needed to operate the device (13). A transmission direction detection circuit (17; 24, 26, 29) has a passive part (24) and a few active components (26, 29). Preferably, the subscriber (8) supplies the power needed to operate the circuit (17; 24, 26, 29).
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