Cheetah 9 Installation Guide, Rev. B | 45 |
W/WD drives
Terminating the drive
“W” model drives are terminated with permanently mounted IC active terminators. If you install one of these drives and it is not on the end of the SCSI bus, disable the terminators by removing the jumper “TE” from pins 15 and 16 of connector J2. If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 15 and 16 of connector J2 (see Figure 13).
Note. Use active (ANSI
“WD” model drives do not have i nternal terminators or any other way of adding internal termination to the drive. You must provide external differential termination to these drives when termination is required. See Figure 3d.
Pin 1
| J2 | Pin 2 |
|
| R T T |
|
| T D MW P E P P |
|
| E S E P D S 2 1 |
Enable Terminator (default) |
| |
Disable Terminator |
| |
|
| Pin 1 |
| J6 | J2 |
| SCSI I/O J1 | |
|
| |
J2 Jumper |
| Connector |
(enlarged to | Drive |
|
show detail) | Front |
|
DC Power
Connector