Sun Microsystems Enterprise Tape Library 7/3500, Руководство по обслуживанию на месте, Страница: 43 / 242

Chapter 1 Library Overview 13
Bar Code Scanner PWA
The bar code scanner PWA is built inside the gripper assembly and detects bar codes
between the upper and lower gripper jaws.
The bar code scanner uses an IR (IR viewing scope is required to see the light) or red
LED that is focused to reflect off the bar code label surface and converge through
receiver optics on a photodetector. The output of the photodetector is amplified and
conditioned to produce a digital signal. The digital signal is decoded on the robotics
controller PWA as bar codes or for calibration.
The bar code scanner uses reflective targets on each bin column and reflective
features on each tape drive bezel to determine X andY positions during calibration.
During an inventory, the bar code scanner reads the bar code labels on the cartridges
and sends a digital signal that is decoded as a bar code on the robotics controller.
Y-Axis Confirmation Sensor (S2)
The Y-Axis confirmation sensor is located on the extension axis assembly. The y-axis
sensor provides feedback to the robotics controller for confirmation on position and
allows the vertical axis to home base on slots in the vertical rail.
X-Carriage Assembly
The x-carriage assembly consists of the x-carriage, the x-axis interconnect PWA, and
the y-axis motor assembly.
FIGURE 1-8
on page 16 shows the location of the
components. The individual components are discussed in the following paragraphs.
The x-carriage assembly rides on the lower horizontal rail and provides mounts for
the vertical rail. It also contains the y-axis motor and the x-carriage interconnect
PWA that provides an attachment point and strain relief for the x-umbilical.