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Theory of operation
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Touchscreen sensor
The models with touchscreen user interface include a resistive touchscreen sensor in the front
of the LCD panel. The touchscreen sensor detects the presence and location of a touch within
the display area and communicates the information to the touchscreen controller.
In non-touchscreen models, the touchscreen sensor is replaced by an optical filter that has a
scratch-resistant, non-glare surface coating.
Keypad
The patient monitor has a backlit keypad board with an on/standby button, 2 or 13 function
keys and 3power indicator LEDs.
The keypad is connected to the user interface board with a connector.
Trim Knob
The Trim Knob control is a rotary-switch with a push selection operation. The Trim Knob
encoder detects the direction of the Trim Knob rotation and push button use and passes that
information to the CPU board via the user interface board.
Alarm light board
The right hand side of the alarm light board contains red, yellow and blue LEDs to display
different priority visual alarms. The left hand side of the alarm light board has blue LEDs for the
silence alarm indicator light.
The alarm light board also has a separate light sensor that is capable of measuring the
ambient light intensity. The ambient light feedback can be used to auto-adjust the brightness
of the keypad backlits, alarm light LEDs and the LCD display backlight to the different ambient
light conditions.
The alarm light board is connected to the user interface board with the alarm light cable.
Speaker
The main speaker is used to provide audible alarms. The speaker cable is connected directly to
the CPU board. The audio signal for the speaker is generated in the CPU board using a tone
generator and an audio amplifier. Audio feedback controls the operation of the speaker.
Buzzer
The buzzer is connected to the user interface board. It functions as a back-up speaker and also
provides an audible power loss alarm.
9.1.5 External Interfaces
Interface boards
There are two versions of the interface board: a Standard Interface Board and an Advanced
Interface Board.
Connector
Standard Interface Board Advanced Interface Board
USB 2.0
2
4
DVI-I 1
1
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