DMC 60™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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what gets displayed on the RGB LEDs will be a function of the input signal being applied, as well as the current fault
state. Assuming that no faults have occurred the RGB LEDs will function as follows:
Servo Input Signal Applied
LED State
No Input Signal or Invalid Input Pulse Width
Alternate between top (LED1 and LED2) and bottom
(LED3 and LED4) LEDs being on and off. When on, the
LEDs display color is orange.
Neutral Input Pulse Width
All 4 LEDs on solid orange
Positive Input Pulse Width
LEDs blink green in a clockwise circular pattern (LED1-
>LED2->LED3->LED4->LED1). The rate at which the
LEDs update is proportional to the duty cycle of the
output and increases with increased duty cycle. At
100% duty cycle, all four LEDs turn on solid green.
Negative Input Pulse Width
LEDs blink red in a counter-clockwise circular pattern
(LED1->LED4->LED3->LED2->LED1). The rate at which
the LEDs update is proportional to the duty cycle of
the output and increases with increased duty cycle. At
100% duty cycle, all four LEDs turn on solid red.
6.1 Brake/Coast Mode
How the DMC 60 responds when it detects a neutral input signal, or the loss of the input signal, depends on the
Brake / Coast setting. When the DMC60 is configured for Brake Mode the M+ and M- leads are internally shorted
when a neutral signal is detected, which will cause an attached motor to resist rotation. If an attached motor is
spinning, then its speed will decrease at a much quicker rate than it would if the M+ and M- leads were allowed to
float. When configured for Coast Mode the M+ and M- leads will float when a neutral input signal is detected.
The current Brake / Coast setting is displayed by the Brake / CAL LED, which is in the center of the triangle located
at the center of the housing. When the device is operating in Brake Mode the LED will be illuminated Red. When
the device is operating in Coast Mode the LED will be off. The Brake / Coast setting can be toggled by pressing
down on the center of the triangle and then releasing the button.
The Brake / Coast setting is stored in non-volatile memory and is re-stored automatically after power cycles.
7
Input Signal Calibration
The DMC 60 accepts PWM input signals with a positive pulse width between 0.6 and 2.4 milliseconds. Due to
variations in controllers it may be necessary to adjust, or calibrate, the pulse widths that correspond to the
maximum forward and reverse duty cycles, as well as the neutral input.
To perform calibration, perform the following steps:
1.
Press and hold the Brake / CAL button. After approximately 5 seconds the top and bottom LEDs will begin
to alternate between Blue and Off. This indicates that calibration has started.
2.
While continuing to hold the button, move the joystick back and forth between full forward and full
reverse, ensuring to reach both extremes. This may be repeated more than once, but there is no required
minimum.
3.
Return the joystick to the neutral position.
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