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40 ST43401N/ND, ST43402ND User’s Manual, Rev. B
For each drive in the middle of the daisy chain, the cable from the preceding
unit connects to one row of pins in (row A or row B), and the cable to the next
unit connects to the other row of pins.
There are two ways to establish a drive as a master (supplying the sync
reference signal to all drives connected for spindle sync).
• Remove the jumper connecting the master/slave pins on connector J4A
(the drives are shipped with the pins disconnected).
• Issue that drive a Mode Select command on the SCSI interface (The jumper
must be connecting the master/slave pins). The spindle sync is controlled
by the RPL bits in page 4, byte 17 of the Mode Select (or Mode Sense)
parameters.
Only one drive in the daisy chain can be established as the master. The master
drive can be located anywhere along the daisy-chain cable as long as both
ends of the cable are terminated.