Go back to the link, enter DEQ in search (suchen) and press GO ( LOS). At the command code part (where you probably looked) you will find you have to make the DEQ-call (similar like ISRT or any other DLI-call) against the IO-PCB and having the I/O-area filled with the specific code you used in your *Q command code. Example is *QA command code. The I/O-area should contain this A.