SCSI Description

Table 3–7 Drive MESSAGE OUT Phase Response

 

 

 

ATN Signal True in Phase...

The Drive Enters MESSAGE OUT…

 

 

 

COMMAND

After transferring part or all of the command descriptor block

 

bytes.

DATA

At the drive’s earliest convenience (often on a logical block

 

boundary). The initiator continues REQ/ACK handshakes until it

 

detects the phase change.

STATUS

After the status byte has been acknowledged by the initiator.

MESSAGE IN

Before it sends another message. This permits a MESSAGE

 

PARITY ERROR message from the initiator to be associated with

 

the appropriate message.

SELECTION1

Immediately after that SELECTION phase.

RESELECTION2

After the drive has sent its IDENTIFY message for that

 

RESELECTION phase.

1Before the initiator releases BSY, provided the initiator asserted ATN

2The initiator should only assert the ATN signal during a RESELECTION phase to transmit a BUS DEVICE RESET or DISCONNECT message.

The initiator keeps the ATN signal asserted if more than one byte is to be transferred. The initiator can negate the ATN signal at any time, except it does not negate the ATN signal while the ACK signal is asserted during a MESSAGE OUT phase. Normally, the initiator negates the ATN signal while the REQ signal is true and the ACK signal is false during the last REQ/ACK handshake of the MESSAGE OUT phase.

3.6.2 Reset Condition

The tape drive responds to power-on and/or bus reset conditions as described:

∙All tape drive SCSI lines assert high impedance when the tape drive is powered off.

∙The drive does not generate any spurious signals on the SCSI bus when the drive is powered on.

∙Within five (5) seconds of power-on, and within 250 milliseconds (typically under 4 milliseconds) after a bus reset, the tape drive responds to SCSI bus selections and returns the appropriate normal responses. Tape motion commands are returned with Check Condition status, Sense Key of Not Ready, until the medium has been made ready.

Quantum DLT 7000 Tape System

3-25

Page 88 Page 90
Page 89
Image 89
Quantum Instruments DLT 7000 manual Reset Condition, Drive Message OUT Phase Response, SELECTION1, RESELECTION2
Page 88 Page 90

DLT 7000 specifications

The Quantum Instruments DLT 7000 is a state-of-the-art battery-powered light that brings advanced photography and videography offerings to professionals and enthusiasts alike. Renowned for its compact design, the DLT 7000 combines lightweight portability with powerful functionality. It is engineered to enhance the creative process by providing optimal lighting solutions in a variety of settings.

One of the standout features of the DLT 7000 is its innovative LED technology. This light source offers consistency in color temperature and output, ensuring high-quality illumination for both photo and video applications. The unit boasts an impressive color accuracy with a CRI (Color Rendering Index) rating that exceeds 90, making it ideal for capturing true-to-life colors in any situation. The DLT 7000 allows users to adjust the color temperature from a warm 3200K to a cool 5600K, catering to different lighting needs and environments.

Moreover, the DLT 7000 features a dimming function that allows for seamless adjustments from 0 to 100% brightness. This level of control not only aids in achieving the perfect exposure but also helps in creating the desired mood or atmosphere for a shot. The robust design of the DLT 7000 includes durable construction material that can withstand the rigors of location shoots, making it a reliable tool for professionals.

In addition to its lighting capabilities, the DLT 7000 incorporates smart technology. It is equipped with a built-in wireless control system that allows users to adjust settings from a distance, promoting flexibility during shoots. This wireless functionality extends to multiple units, enabling synchronized lighting setups for complex scenes.

Another notable characteristic of the DLT 7000 is its versatile power options. The light can operate on lithium-ion batteries, ensuring long-lasting performance during extended shoots without the constraint of power outlets. There is also an option for AC power, providing users flexibility in various shooting locations.

In summary, the Quantum Instruments DLT 7000 stands out with its combination of advanced LED technology, adjustable color temperatures, built-in dimming capabilities, and smart wireless controls. Whether for professional photography or videography, this light is designed to meet the demands of the most discerning artists, making it an essential addition to any lighting kit.
Top Page Image Contents