Feature switches
The tape drive contains eight factory set feature switches, by which the drive can be configured for unique
function. The switches are on the bottom of the drive. The switch positions are labeled 1 through 8. The
on and off positions are marked on the switch.
Table 9: Feature switch definitions
Switch
1
On function Off function
1 Library interface at 9600 baud /
polled
Library interface at 38,400 baud /
nonpolled
2 Library interface uses two stop
bits
Library interface uses one stop
bit
3 Pin 8 of each AL_PA/LID/Status
connector is jumpered to ground
ensuring that AL_PA
configuration is done over the
automation interface (see
ADC-4). Pins 1-7 of each
AL_PA/LID/Status connector
have no function.
Pins 1, 2, 3, 4, 7, and 8 of each
AL_PA/LID/Status connector are
jumpered to ground ensuring that
AL_PA configuration is done over
the automation interface (see
ADC-4). Pins 5 and 6 of each
AL_PA/LID/Status connector
provide FC loop status.
4 Library interface at 115,000 baud
rate
Switch #1 active
5 ADI only ADI Auto-negotiate
6 OEM support for LEDs for HH
SAS
Default for SCD support
7 Disable head brush ERP
2
Allows head brush ERP
2
8 Override auto mode online. Auto mode Online Enable
1
The default settings for the feature switches are all switches placed in the "OFF" position.
2
The head brush error recovery procedure (ERP) is the last effort the drive makes in some cases to recover from what
would otherwise become a permanent read or write error. The ERP removies any debris which may have
accumulated on the read/write head by use of the brush. To brush the head requires that the tape be unthreaded to
expose the head. This forces the loader to be cycled to enable re-thread. During the loader cycling, the back of the
cartridge will temporarily extend beyond the front of the bezel and this is not acceptable in some automation
environments, which is why it can be disabled. Disabling the head brush ERP prevents this last ditch effort by the
drive to prevent a permanent error and as a result, if the drive ever would invoke the head brush ERP (because of
some error condition), it will instead immediately report that permanent error.
Library interface (ADI) connections
The tape drive contains a Library Interface (ADI) by which the drive can communicate through an RS-422
connector with a library control system. The drive supports the INCITS/T10 standard ADI protocol. The
connections to the RS-422 connector (J10 on SCSI card, and J11 on FC card) are indicated in the
following figure.
32 Feature switches
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