CPU boards and softwares
Document No.8002948
5
Watchdog functions
There are certain watchdog functions to ensure the monitor’s performance. The UPI4(NET) board
and the primary display controller board interrupt the CPU board continuously in order to state that
they function properly. The CPU board refreshes the watchdog timer in the power supply unit in
order to prevent reset pulse. If the primary display controller board or the CPU board stops the
refreshment, the monitor will be reset in order to prevent false information to be displayed on the
screen. If the UPI4(NET) board stops the refreshment, the board will be reset internally.
SRAM M48T18
Lithium battery back-up 8 kB static RAM with a real-time clock.
CAUTION
The IC contains a lithium battery. Discard the battery according
to local regulations
.
2.2
Software Cards, U-xxxxxx/L-xxxxxxS/S-xxxxxS
Upgrade software, U-xxxxxx and Service software, L-xxxxxxS/S-xxxxxS are delivered on an 8 MB/4
MB PCMCIA flash memory card.
The upgrade software has been developed for monitor software upgrades. The uprgade software
can be downloaded onto a monitor that is equipped with the B-CPU5/B-CPU4.
The service software has been developed to replace the original monitor software in case of a B-
CPU5/B-CPU4 failure. The service software is downloaded onto a replacement empty B-CPU5/B-
CPU4. See section 3.3.1
“Downloading/replacing software on CPU Board, B-CPU
”
There is service software available of each S/5 monitor software version. The functionality of the
service software is equal to the functionality of the corresponding original S/5 monitor software.
The Service software, L-xxxxxxS is license software. The license agreement that is delivered with the
software should be archived in a secure location. Relevant license number may have to be referred
when contacting Datex-Ohmeda for service/support. The licence number is needed also for
possible software upgrades.
CAUTION
The software card is not write-protected. For safety reasons do not use software
cards in any other purposes, or on any other platforms than they are designed for.
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