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Revision C 250cx Series Maternal/Fetal Monitor 2-25

2036947-001

Equipment Overview: Theory of Operation

FECG signals as well as the MECG mode lines. The MECG analog signals are

routed separately from the front panel to the MECG daughter PWA. The MSpO

input signals enter the SpO

carrier PWA directly.

Video Decoder PWA

The decoder PWA interfaces between the DSP/Display PWA and the LCD panel.

The decoder PWA performs conversion of 4-bit color information from the FPGA

output to the 18-bit color required by the LCD panel. This provides a 16-color

palette. The translation is accomplished in the FPGA on the decoder PWA. This

PWA receives high-speed video from the DSP/Display PWA.

Recorder PWA

The recorder PWA is responsible for driving the recorder motor and the recorder

printhead device along with providing the main system PWA with paper out/low/

misload status. To drive the motor it receives pulses from the main system PWA and

provides the proper drive circuitry to drive the stepper motor 4 phase windings. To

drive the printhead an adjustable power supply is provided which is set to the

printhead specifications (each printhead is unique). Data to be printed and control

information is received from the main system PWA, buffered and presented to the

printhead. Sensors from the recorder assembly to detect paper low/out/misload are

received and translated to digital status lines to be sent to the main system PWA.

Communications PWA

The Communications PWA contains three basic interfaces. It supports the analog

interface (J102) to the legacy Spectra 400 surveillance system as well as other

manufacturers centrals, a 2116 external keyboard interface for strip chart annotation,

and an analog telemetry interface to the 340 telemetry system. The communications

PWA communicates to the system by directly plugging into the main system PWA.

Digital data from the keypad interface and telemetry (modes only) is transferred

through a data bus and analog signals (MECG, FECG, Ultrasound, TOCO) from the

telemetry are separately routed through the main PWA to the DSP for processing

similarly to the existing front panel patient data.

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