155.2.2 CHANGE-RCSU

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>;).
A recorder that is referenced by either AMO DNIT or AMO ACDRT can not have the following parameters changed: OPMODE, OPTYPE, RECAPL, RECNUM or MUSNUM. The parameter LENGTH may be changed even if the recorder is referenced.