permitted an audio watermark consisting of the device identifier 2345 can transmitted as 11111111 0010 0011 0100 0101 11111110 including a start code and an end code other lengths and configurations of start codes and end codes also can be used in the examples described in this section the nature of the information in the audio watermark can be determined from its expected length and its position for example an audio watermark signal containing a device identifier and a timestamp can take the form of where start code is 2 bytes device id is 4 bytes timestamp is 8 bytes and end code is 2 bytes alternatively the information can be signaled in some other way in this section an illustrative use of audio watermarks in a distributed control system is described for more information on distributed control systems and related methods see u s patent application ser no 14 918 392 entitled u201c systems and methods for distributed control u201d filed on oct 20 2015 which is incorporated herein by reference fig5 is a high level schematic diagram that illustrates communication between various components of an exemplary embodiment of a distributed control system according to various aspects of the present disclosure the system 500 is configured to allow for distributed control of.