Patent ID: 8531942
Filing Date: 2013-09-10
Classification: H04L

Abstract:
1. A communication system comprising a first and a second master unit and at least one slave unit, the second master unit being switched into a data transmission chain reaching from the first master unit to the slave unit to continue data transmission if a link fault occurs, the data transmission chain comprising double-conductor structure having a first, second and third communication path, the first and the second master unit each comprising a transmitter unit for transmitting data signals connected to the double-conductor structure via first terminals, a receiving unit for receiving data signals connected to the double-conductor structure via second terminals, and a control unit for transmitting data signals connected to the transmitter units and to the receiving units, the second master unit further comprising a master coupling unit connected between the control unit, the receiving unit and the transmitter unit in order to separate the control unit from the receiving unit and the transmitter unit in a first operating mode upon receiving data signal from the first master unit on the double-conductor structure and in order to connect the control unit with the receiving unit and the transmitter unit in a second operating mode upon interruption of the receipt of data signals from the first master unit on the double-conductor structure, in order to carry out a data transmission of the double-conductor structure, the second master unit further comprising a third terminal which is connected to the third communication path, wherein the master coupling unit short-circuits the second terminal connected to the receiving unit and the third terminal in the first operating mode and opens the short-circuit of the second and third terminal in the second operating mode.