Seagate ST212 - 3.3 Radial; 3.4 Write Fault; 3.5 Life Test

3.3 RADIAL
The Radial option is enabled by shorting pins 15 and 16 at the J9 shunt. Drives
configured to this option are always selected
and respond to ail control signais
issued
on the attached control cable. The 220/330 0 resistor termination pack
must remain installed
on each radially-connected drive. Figure 9 illustrates a
host/drive Radial interconnection.
FIGURE 9:
Radial Configuration
DRIVE 1
h
CONTROL CABLE
r
J1
~
l..-
TERMINAlOR PACK
'""'"'"' CONTROL CABLE
INSTALLED
r-l
---f
r
J2
AS SHIPPED
~
CONTROU
STATUS
CONTROL
DRIVE 2
SIGNALS
~ CABLE ':\--./ "--
r
r-lCONTROL ~
J1
TERMINAlOR PACK
_ CABLE
r
INSTALLED
J2
AS SHIPPED
DRIVE 3
......,
L----e
J1
,...JDATA CABLE
TERMINAlOR PACK
---e=
INSTALLED
.....,
J2
AS SHIPPED
DATA CABLE "-
DATA SIGNALS
DRIVE 4
,.....J DATA CABLE L-I' "---C
J1
TERMINAlOR PACK
INSTALLED
H
DATA CABLE
r-
J2
AS SHIPPED
~
L
3.4
WRITE FAULT
The WRITE FAULT signal is intemally latched. A selectable option is provided
to clear tbis latch. The standard configuration, with the shorting block removed,
resets the WRITE
FAULT latch when WRITE GATE is dropped and reasserted
after the detected fault has been cleared. With pins
11 and 12 shorted, WRITE
FAULT latch is reset when DRIVE SELECT is dropped and reasserted after the
detected fault has been cleared.
3.5
LIFE TEST
This function is used during the manufacturing process and is Dot recommend-
ed for field use. When pins 9 and 10 are shorted, the stepper motor will con-
tinuously seek between Track
0 and the maximum cylinder. When in this mode
the drive will ignore control signais sent via the interface.
12
ST212 PRODUCT MANUALIRev. B