DALVLSEQ specifies which volume, of a multi-volume data set, processing is to begin with. This key is mutually exclusive with the SYSOUT key (DALSYSOU). When you code DALVLSEQ, # must be one, LEN must be two, and PARM contains the volume sequence number. The maximum PARM value is '00FF' (255).
KEY # LEN PARM
0012 0001 0002 0002