Some of the control units (NOT ALL) have their own "slave" blocks. These "slave" blocks are the subsystems (like example: the control unit 09 have rain sensor as the subsystem. It depends on what subsystems control unit have). To access this function follow the instructions:
the subsystem block is opened. The name of subsystem is displayed beside of original control unit name (there are two options for this block as a "Info" and "Long Coding", the variety of appeared functions depend on the block).
button to open the information of subsystem block.
button to open the long coding of subsystem block.