Seagate ST43402ND user manual Making ST43401N/ND spindle sync connections

38 ST43401N/ND, ST43402ND User’s Manual, Rev. B

To enable the feature, it is necessary to run an additional daisy-chain cable from drive to drive and to make a master/slave selection for each drive. Connector J7 is used by ST43401N/ND drives. Connector J5 on the control board handles the cable connections on ST43402ND drives. Master/slave selection is made by a jumper on connector J4A. Figure 20 shows the two connectors for ST43401N/ND drives, and Figure 21 shows the two connec- tors for ST43402ND drives.

For a drive at the end of the daisy chain, the cable connects to one of the two rows of pins (row A or row B), and a terminator connects to the other row of pins. Both ends of the cable must be terminated.

Pin 1

J7

Cable from

Preceding Unit

A

B

Cable to

Next Unit

Select Plug

Control

Board

J4A

Slave Select

(removed = master)

Figure 20. Making ST43401N/ND spindle sync connections