Description of the illustration slk_121.png
Byte 0: Operation Code (1Dh)
Byte 1: Ignored Bit 7 to 5, PF(1) Bit 4, Reserved Bit 3, SelfTest(0) Bit2, DevOfl(0) Bit 1, UnitOfl(0) Bit 0
Byte 2: Reserved
Byte 3 to 4: Parameter List Length
Byte 5: Control Byte (00h)