Method for initiating a communication link between a field device and a control unit

A method for initializing a communication link between a field device and a control unit according to a communication protocol wherein the communication protocol defines a broadcasting message with a data area, the method comprising:

• generating and transmitting a broadcasting message by the field device according to the communication protocol with a first datum in the data area and wherein the first datum determines whether a communication link is possible or not;
• receiving the broadcasting message by the control unit;
• and
• then, when the first datum determines the possibility of the communication link, initializing the communication link by the control unit,
• wherein a duration until the communication link is possible is determined by the field device as the first datum;
• wherein the communication link is initialized by the control unit after the duration has elapsed;
• and
• wherein the field device reduces the duration by a waiting time and, after the waiting time has elapsed, the broadcasting message is transmitted again with the reduced duration.

A method for initializing a communication link between a field device and a control unit according to a communication protocol wherein the communication protocol defines a broadcasting message with a data area, the method comprising:

• generating and transmitting a broadcasting message by the field device according to the communication protocol with a first datum in the data area and wherein the first datum determines whether a communication link is possible or not;
• receiving the broadcasting message by the control unit;
• and
• then, when the first datum determines the possibility of the communication link, initializing the communication link by the control unit,
• wherein the first datum is stored in a bit of a byte in the broadcasting message.