| 摘要 |
This invention relates to a system comprising a network server coupled to and a number of networks clients connected to said networks server through a daisy chained network where set networks clients comprises a clamper circuit parallel coupled to said daisy network, said clamper comprises detection means adapted to detect a signal transmitted through said daisy network and clamping means adapted to short circuit said daisy network when said signal has been detected. Characterized in that detect and blocking circuit (41) can detect a signal on the transmission line via measuring voltage or current going trough the transmission line, and as a result of a detection block the signal (32) or by other means interrupt the signal in that detect and blocking circuit (41) can be enabled and disabled (38) by the network client controller (33) in that a detect and blocking instance is memorized by detect and blocking circuit enabling the network client controller (33) to acquire (37) from detect and blocking circuit (41) if a detect and blocking instance has occurred. |
