Datascope Accutorr Plus - CPU;NIBP Module Assembly with LCD Display

Accutorr Plus Service Manual 0070-10-0691 1 - 3
Theory of Operation CPU/NIBP Module Assembly with LCD Display
1.2 CPU/NIBP Module Assembly with LCD Display
The Accutorr Plus CPU/NIBP module controls the functions of the NIBP, temperature
probes, and SpO
2
module; transmits output data to the recorder; and provides a serial I/O
port connection for PC communication.
The CPU/NIBP module distributes power from the power supply, which includes power
and control signals to the LED/Tone module, to the remaining components of the system
such as the recorder and SpO
2
modules. The CPU/NIBP module also supplies separate
power to the LED backlight and provides trend data to the display.
The CPU/NIBP circuit board is comprised of both software and hardware. The following
is a summary of the software control exercised and the major hardware affected. This is
for informational purposes only, and both software and hardware controls may be changed
at any time without notice.
1.2.1 Software Overview
The software performs the following functions:
1. Initializes hardware and software modules
• Microcontroller ports and communication (serial) interfaces
• Software entry points and variables
• Read configuration from NVRAM
2. Performs power up diagnostic
• Microcontroller, FLASH, and STATIC RAM test
3. Performs NIBP functions
• Start measurement
• Repeat measurement
• Over pressure limit
• Enter or exit test mode
• Abort measurement
• Enter or exit calibration mode
• Update alarm limits
• Report alarm status
•Report data
• Determine inflation pressure
• Perform controlled cuff deflation
• Monitor DC and AC pressure and acquire pulsations
• Reject artifacts
• Decide on termination point and exhaust cuff pressure
• Smooth pulsation data
• Determine systolic, mean, diastolic pressure and heart rate
• Check alarm conditions
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