Digilent DMC 60 Panduan Referensi - Halaman 5

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DMC 60™ Reference Manual

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

No Input Signal or Invalid Input Pulse Width

Neutral Input Pulse Width

Positive Input Pulse Width

Negative Input Pulse Width

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.

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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LED State

Alternate between top (LED1 and LED2) and bottom

(LED3 and LED4) LEDs being on and off. When on, the

LEDs display color is orange.

All 4 LEDs on solid orange

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.

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.

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