SC 7000 and SC 9000XL Patient Monitors Service Manual
ASK-T898-03-7600 Siemens Medical Systems, EM-PCS Danvers 9
7k9kXLTM.c2.CD_ROM.fm/04-99/kaupp
NOT A CONTROLLED DOCUMENT
1.4 Error Handling
The hardware provides several circuits for error detection, error recovery,
and safety. The main processor bus, front end processor bus, and REMOTE
COMM bus both have timeouts implemented with the arbiter to prevent a lock
up of the system. The REMOTE COMM bus also contains a CRC for serial
transmission to and from the CPS or IDS. If a bad CRC is detected an
interrupt is sent to the main 860. The main 860 and the Front End 860 are
both protected with watchdog timers. If a timer expires, the system initiates a
reset and restarts the monitor.
The power supply is also monitored with a piezo alarm that sounds during
power up (for test) and power down. This is to alert the user that the monitor
has turned off. The piezo alarm does not sound during a "Pick and Go"
since the monitor switched to battery operation without interruption. The
piezo is also sounded continuously if the monitor does not reset properly
after a watchdog timer has expired and the computer has halted.
Figure 2-3 SC 7000 / SC 9000XL Block Diagram
2Main Unit
Both monitors are designed to be lightweight and portable. The division of
the REMOTE COMM bus and internal buses are a direct mapping of what
is needed during transport and what can be left in the patient’s room. The
REMOTE COMM bus is connected and disconnected via a docking station
which has a locating feature for the monitor as well as a locking latch. The
main unit has been designed as a single board computer. In addition to the
main board there is a front bezel board to interface to a flat panel display,
and a connector board used as a cable harness in the rear chassis. The
main processor board contains three sections (see Figure 2-3): processor,
power conversion, and front end. Each section is shielded from the others.
Memory
Card
Internal
Battery
I/O Interfaces
Remote Comm
RAM Memory
VGA Graphics
Flash Memory
RAM Memory
860
Main Processor
LCD Display
Front Panel
Controls
External
Battery
Front Panel
Audio
Uart & Comm
Alarm Out
Keypad
RT Clock
Recorder
Chart
Recorder
860
Front End
Processor
Pod 2
Pod 1
etCO2 Cartridge
HemoMed Pod
MultiMed Pod
I/O Interface
NBP
2181 DSP
POD
Com
RAM Memory
Bridge
Analog Out
QRS Sync
ECG/Resp
Temp
SpO
2
HEMO2
HEMO4
12 Lead
tcpO
2
A
B
C
D
Press
C.O.
CRT
3RVVLEOH
32'V
EEG
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