B: Theory of Operation Functional Descriptions
202
CO
2
The HeartStart XL+ supplies 5 V DC power to an external CO
2
module which performs all
measurement functions and communicates the results via a serial interface to the HeartStart XL+. Several
types of external CO
2
measurement modules are supported. Power is enabled only when a module is
present. A module is detected when the module connects pin 7 to pin 3. The type of module present is
then determined based on the signal provided on pin 8.
Audio
The HeartStart XL+ has three types of audio output: voice prompts, tones, and “chirp” when there is a
“red X” RFU condition. The voice prompts and tones are generated and controlled by the Processor
PCA, which also amplifies the signals and passes them directly to the speaker via a wire pair.
When the device is turned off, the audio controller on the Therapy PCA remains active and powers the
audio amplifier on the Processor PCA as needed to produce the “chirps” through the same amplifier.
Data Storage
The HeartStart XL+ has the capability of storing the following information:
• Patient data — acquired during an event.
• Configuration data — set up by the user to define specific settings related to the behavior of the
device.
• Support data — generated by the device to support the maintenance and service of the device.
• Device data — set up by the manufacturer to define installed options, serial numbers, etc.
The data are stored on the SOM PCA and can be imported or exported via a USB flash drive.
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