Table of Contents
Advertisement
Barracuda 1 and 2 Product Manual, Rev. C
10.2.1.2
10.2.1.3
Termination
The reference index signal (SSREF ) is terminated with a 2.21K ohm
resistor. Each single-ended drive has a terminator resistor located on the
main PCB. The terminator resistor is not removable and is always in the
circuit. A diode prevents current backfeed.
Physical interface
ST11950N/ND and ST12550N/ND drives
Dimensions of the ST11950N/ND and ST12550N/ND J4 connector mounted
on the main PCB to interconnect the drives are shown in Figure 21. It is a 22-
pin, 11-position gold header type connector. Only pins 1 and 2 are used for
connecting the reference index signal cable, as shown in Figure 17. Pin 1 is
SSREF+ and pin 2 is ground.
.079
(2 mm)
Figure 21. ST11950N/ND and ST12550N/ND configuration
select header specification
ST11950W/WD and ST12550W/WD drives
Dimensions of the ST11950W/WD and ST12550W/WD J5 connector
mounted on the main PCB to interconnect the drives are shown in
Figure 22. It is a 12-pin, 6-position gold header type connector. Only pins
11 and 12 are used for connecting the reference index signal cable, as
shown in Figure 19. Pin 11 is SSREF+ and pin 12 is ground.
.079
(2 mm)
(2 mm)
Figure 22. ST11950W/WD and ST12550W/WD configuration
select header specification
.866
(22 mm)
.079 (2 mm)
J04
.787
(20 mm)
.520
(13.2 mm)
J5
.079
Pin 1
.185
(4.7 mm)
51
Advertisement
Table of Contents
