The invention relates to a method for line-conducted bidirectional communication between subscribers in a measuring system, the subscribers being arranged in a chain-like series structure. In said series structure, each of the subscribers is connected to one of the subscribers that precedes same by means of a first communication interface and to one of the subscribers that follows same by means of a second communication interface. Each of the subscribers has a message processing unit, by means of which the first and second communication interfaces can be operated independently of each other in order to send and/or receive a message. In the communication by the message processing unit, the message is received as a digital data structure by means of the first communication and an identification range of the message is evaluated by comparing a content of the identification range with specified target criteria. Depending on the comparison result, the content of the identification range of the message is modified on the basis of a predefined mapping function, which determines a content of the identification range to be sent on the basis of the received content of the identification range, the message having a modified identification range subsequently being forwarded by means of the second communication interface, and/or the message is processed in the subscriber.