HP NonStop G-Series - Manual (Page 18)

Chapter Five - SCSI Bridge Electronics
5.1 Introduction to the 5242-2SE Display
At the heart of the display system is the Infourmm SCSI bridge, which provides performance information
about the tape operation. In addition to bridging communications between the host and tape drive,
Infourmm autonomously sends commands to the tape drive to extract the data necessary for the display. A
high-performance CPU and dual SCSI buses allow the unit to appear to the host as a tape device on the host
bus and interface with the tape drive as a new host on the tape bus. This private tape bus can operate
independently of a host to provide such capabilities as tape mirroring, off-line drive testing and tape
duplication. Other features include software configuration retained in nonvolatile memory, flash memory
for firmware upgrade, and low semiconductor parts count for reliability.
5.2 Front Panel LCD
A four-line, eight-character-per-line, backlit LCD provides performance information, configuration
selections, diagnostic and special utility menus. During tape activity, the LCD shows the current tape-drive
operation, a bar graph tracking tape capacity, and items such as total data transferred, average transfer rate,
compression ratio, ECC rate percentage, remaining tape capacity, and rewrite percentage. When entering
the configuration, diagnostic or utility menus, the LCD presents a series of items to choose from and
instructions to follow.
Mode
Switch
4-Line LCD,
8-Characters per line
Programmable
Error-Alert LED
Compression
Indicator LED
Figure 12
Display unit controls and indicators
Warning: Using the LCD functionality to change operations or configuration
parameters without proper understanding can cause the 5242-2SE to become
nonoperational.
5.3 Mode Switch
The mode switch is located in the right lower corner of the display unit. It is used to select the SCSI ID,
access the off-line utilities, and perform the initial setup of the unit.
HP StorageWorks DAT 72 (Model 5242-2SE) User's Guide
14 HP Part Number 528297-003 July 2005