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Philips 862478, 862474 manual Navigation Wheel RS-232 I/O Defib Sync Pulse Speaker

Models: 862474 862478

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Theory of Operation and System Architecture

Navigation Wheel

RS-232 I/O

Defib Sync Pulse

Speaker

The Contrast button operates in conjunction with the navigation wheel to determine the apparent contrast setting in the display. Changing the contrast is a change in the viewing angle. Outputs of the button and wheel are connected to the processor.

Momentarily pressing the button sets the contrast to mid-range, factory-default value.

Momentarily pressing of the button, followed within 3 seconds by a rotation of the wheel are processed to vary the contrast of the display. When there has been no wheel rotation for 3 seconds, the contrast control function is terminated by the processor. The contrast control function is also terminated if the wheel is pressed any time within this 3 second interval.

Operation of the Volume button accomplishes similar functions for the volume of the heart rate audible tone as the display contrast control button does for the display. Pressing this button, enables the wheel to vary the tone volume.

This is a rotating, push-switch wheel. The associated wheel circuitry generates a pulse when pressed and generates a digitally encoded pair of quadrature signals whose relative magnitudes and polarities represent the angular position of the wheel. These outputs are connected to the processor where they are interpreted as required for the functions involved. Successive angular positions determine the direction of wheel rotation.

In addition to the functions performed when in conjunction with the keypad as described above, the wheel operates in conjunction with the display to select menus and lists of parameter variables.

This is a rear panel 9-pin connector providing interfaces with other computer systems or equipment. The driver for this "port" is a Universal Asynchronous Receive-Transmit (UART) integrated circuit that interfaces this port with the microprocessor. The baud rate for this serial transmission function is programmable from 1200 baud to 38.4 kilobaud.

Pin number 9 of the RS-232 connector is reserved for a Nurse Call signal. The nurse call signal reacts when a low, medium, or high level alarm is activated.

The rear panel connector for the Defib Sync Pulse is keyed so that the connection of a cable can be detected by the processor. When a connection is detected, the processor software initiates the generation by hardware of a TTL-compatible pulse capable of driving 1 TTL load over a three-meter cable with less than 200 pF capacitance.

The defib pulse is triggered by the detection of the R-wave in the QRS sequence of the ECG wave-form complex. The pulse signal is active for 100 ±10 ms.

The speaker is capable of providing 73 dBA of volume at a distance of one meter during alarm conditions. The processor drives the speaker in different patterns as specified for the different alarm priorities and conditions. Refer to the C3 Instructions for Use guide for descriptions of alarm responses.

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Philips 862478, 862474 manual Navigation Wheel RS-232 I/O Defib Sync Pulse Speaker
Page 165 Page 167

862474, 862478 specifications

The Philips 862478 and 862474 are standout products in the realm of advanced lighting solutions, showcasing the company's commitment to innovation and high-quality design. These models highlight the integration of modern technology and user-centric features, making them ideal choices for both residential and commercial settings.

One of the main features of the Philips 862478 is its versatility in application. This model is particularly designed to offer both ambient and task lighting, which can be invaluable in creating the right atmosphere in any environment. Its sleek design is complemented by energy efficiency, aligning with contemporary demands for sustainable solutions that do not compromise on performance.

The Philips 862474, on the other hand, emphasizes smart technology integration. It boasts compatibility with various smart home systems, allowing users to control their lighting through voice commands or mobile applications. This feature enhances convenience and accessibility, catering to the busy lifestyles of modern users. Both models utilize LED technology, ensuring long-lasting illumination while significantly reducing energy consumption compared to traditional lighting alternatives.

In terms of performance, the brightness levels of the 862478 and 862474 are adjustable, providing users with the flexibility to tailor lighting intensity to their needs. This adaptability is essential in spaces that require varied lighting conditions throughout the day. Additionally, the color temperature options available with these models range from warm to cool light, promoting comfort and productivity in different settings.

Safety features are also paramount in these Philips models. They comply with international safety standards, ensuring that users can trust their durability and functionality. The materials used in their manufacture are of high quality, further enhancing their robustness for long-term usage.

Overall, the Philips 862478 and 862474 exemplify the brand's focus on smart, energy-efficient lighting solutions that seamlessly integrate into modern lifestyles. Their blend of functionality, aesthetic appeal, and advanced technology makes them a favorable choice for consumers looking to enhance their living or working spaces. Whether it’s for creating a cozy home environment or an efficient work area, these Philips models stand out as reliable and innovative lighting solutions.