![](/images/new-backgrounds/1109884/10988495x1.webp)
9.1.2Function description
J6 |
|
|
jumper |
|
|
installation | Jumper function description | |
SE |
|
|
On |
| Forces drive to use |
Off |
| Drive can operate on the interface in low voltage differential mode or |
|
| ing on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not installed. |
DS | ME |
|
Off | Off | Spindle starts immediately after power up - Default setting. |
Off | On | Drive spindle does not start until Start Unit command received from host. |
On | Off | Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0 |
|
| spindle starts immediately when DC power connected, drive 1 starts after 12 second delay, |
|
| drive 2 starts after 24 second delay, etc. |
On | On | Drive spindle starts when Start Unit command received from host. Delayed start feature is |
|
| overridden and does not apply when ME jumper is installed. |
WP |
|
|
On |
| Entire drive is write protected. |
Off |
| Drive is not write protected. Default is WP jumper not installed. |
PD |
|
|
On |
| Parity checking and parity error reporting by the drive is disabled. |
Off |
| Drive checks for parity and reports result of parity checking to host. |
|
| Default is PD jumper not installed. |
RES |
|
|
Off |
| Reserved jumper position. Default is no RES jumper installed. |
TP |
|
|
Off |
| The drive does not supply terminator power to external terminators or to the SCSI bus I/O |
|
| cable. |
On |
| Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a |
|
| jumper on the TP position may be needed to power external terminators (see system docu- |
|
| mentation). These drives do not have terminator circuits on the drive. |
Note. | J6 does not exist on the LC model and is supported on the LW model only. |
42 | Cheetah 15K.5 SCSI Product Manual, Rev. J |