A recorder which is in the ready state cannot have data changed unless deactivated by AMO DSSU. When a random start recorder is deactivated, it should be an immediate deactivation (DEA-
DSSU:DI,...) whereas the fixed start recorder can be deactivated conditionally (DEA-
DSSU:DC,...) or immediate. To determine the status of the recorder, use AMO
SDSU (DIS-
SDSU:,,PEN,PER3, <LTG>,<LTU>,<SLOT>,<CIRC>;).