Dynatron® 850plus & 550plus
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Processor Interaction
Processor Interaction with the Keyboard and Displays
The keyboard is controlled by a microcontroller which scans the keys for key presses, keeps
the displays updated, and reads any position from the XY pad. Periodically (several times per
second) the main processor polls the keyboard processor, receiving status of any keys pressed
or XY position, and updating the displays as required.
Processor Interaction with Oscillators
The processor controls the internal oscillators that generate the therapy wave forms. It
initially calibrates the proper output frequencies during the test cycle, and then keeps track of
the frequency the rest of the time the unit is on. If the oscillator happens to drift too far out of
range for the processor to calibrate it, the processor will give an error message.
During the treatment, the processor causes the sweep frequency oscillator to change its
frequency at a controlled rate. It chooses the rate and frequency from what is selected on the
keyboard when the treatment is set up, or when changes are made during the treatment. It
tracks and keeps the fixed frequency where it should be during the treatment. It also keeps
track of the 2500 Hz signal that creates the Russian therapy (turns it on and off at a 50 Hz
rate).
OSCILLATORS
1 4 KHz fixed
2 4000-4010 Hz (Interferential Low option)
3 4080-4150 (Interferential High option)
4 2500 Hz (Russian)
Processor Interaction with the Output Jacks
The processor board controls the proper channeling of the output signals to the output jacks. The
processor also activates and senses the relay that allows output from the unit.
Processor Control of Output Waveforms
The output waveforms are generated by a Digital Signal Processor on command from the
main processor. Since the signals are digitally created, the accuracy of the waveform is
derived from the crystal clock of the processor, whose accuracy is typically .001% or better.
Both the output intensity as well as the frequency are digitally controlled through
communication between the main and the Digital Signal processors.
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