Patent ID: 8533307

Claim:
A method for monitoring a data transmission between at least two network users, comprising: transmitting, by at least one sender data in a form of data telegrams to at least one receiver, a data transmission taking place via at least one data telegram; transmitting, by the receiver, at least one flow control telegram to the sender when the data of a data transmission is transmitted in a segmented manner in a first data telegram and at least one subsequent data telegram; transmitting an additional flow control telegram from the receiver to the sender after a last data telegram of a data transmission; and checking, by the sender, whether the receiver can be operated in a confirmed transmission mode with sending of the flow control telegram at the end of the data transmission in that the sender sends one or more test or configuration messages and checks receipt of a corresponding flow control telegram as a confirmation, so as to provide efficient network security, in which the network may be operated in the confirmed transmission mode and a conventional transmission protocol, and in which before communicating in the more advanced mode of the confirmed transmission mode, the sender checks whether such an operation is feasible.