Revision B 120 Series Maternal/Fetal Monitor 4-3
2015590-001
Theory of Operation: Main Motherboard
from the host processor is summed into the main audio and is not controlled by the
main processor. Figure 4-4 provides a summary of the audio control flow.
Figure 4-1. Main Motherboard Input Parameter Data Flow
Figure 4-2. Main Motherboard Switch Input Data Flow
Main Motherboard
MSpO2 Module
NBP Module
DSP Board
Dual Ultrasound
UA/FECG
RS-232C
RS-232C
Shared
Memory
MECG
RS-232C
FSpO
2 Module
Main Motherboard
DSP / Switch
Interface Board
Recorder Board
Front Panel
Switches
Switches
Rear Panel Module
Switches