GE Corometrics 126, Руководство по обслуживанию

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4-2 120 Series Maternal/Fetal Monitor Revision B
2015590-001
Theory of Operation: Main Motherboard
Main Motherboard
NOTE:
Main Motherboard 2000608-003 (with software version 2.0) replaces
earlier version 11619 Boards. If you update an older monitor (11619 Main
Board and 3-inch x 3.75-inch display) with a new Main board, which is
factory-set for the new larger display (3.5-inch x 4.5-inch display), the
Main screen will have space below the bottom row of softkeys. Use the
Flasher Software Utility Kit, to re-configure the monitor software to
operate with the installed smaller display. Refer to
“Display Upgrade” on
page 12-40 and “Upgrading to a 3.5” x 4.5” Display” on page 7-11 for
more information.
Functional Overview
The Main Motherboard makes up the central processing unit of the 120 Monitor.
The Main Motherboard accepts simultaneously processed parameters directly from
four separate modules. A Model 126 Monitor has the DSP Board as its only input
module. Heart rate data, uterine activity data, mode information, and FMD data flow
from the DSP Board to the Main Motherboard via shared memory. Maternal and
fetal pulse oximetry make up the second and third modules. Information from these
devices is passed to the Main Motherboard via internal RS-232C ports. Maternal
blood pressure makes up the fourth module which also passes data via an internal
RS-232C port.
Figure 4-1 shows the data flow.
Switch/Status Input Data Flow Diagram
The Main Motherboard also processes information coming in from buttons and
sensors. Information from the front panel switches comes from the DSP Board
(passed through the main microprocessor). Status information comes from the
Recorder Board and the Communications Board interface.
Figure 4-2 provides a
summary.
External/Internal Communication Data Flow
The Main Motherboard handles all internal and external data communications. Four
external communication interfaces are present. For the Corolan interface, monitor
data flows predominantly from monitor to master. Three external RS-232C
communication interfaces are set up predominantly to receive data from external
parameter monitors such as fetal pulse oximeters, maternal pulse oximeters, and
maternal blood pressure monitors. Internal communications consists of three
channels of RS-232C for NBP, MSpO
2
, and FSpO
2
. Figure 4-3 provides a summary
of the communication data flow.
Audio Control Flow
Another function of the Main Motherboard is to control the audio from various
sources. Pure audio (non-processor generated) information comes from the
Ultrasound Board (US and US2) only. The remaining sources of audio are generated
by the processor through the use of timers and the host processor. Timer sources of
audio are initiated by the FECG, NBP, MSpO
2
, and DSP internal modules. Audio