2. Additional Information
2.1. Brake & Coast Modes
The Talon SRX has two modes: Brake and Coast. When a neutral signal is applied to the Talon SRX
in Brake mode, the motor will resist rotation, especially high speed rotation. This is accomplished by
essentially shorting the motor leads together, which causes a Back Electromotive Force (Back-EMF)
to resist the rotation of the motor. Brake mode does not have any effect when the motor is not rotating,
but can make a large difference in robot behavior when used on a motor attached to a high reduction
gearbox. Brake mode does not impact performance when the motor is being driven by the Talon SRX.
When a neutral signal is applied to the Talon SRX in Coast mode, Back-EMF will not be generated,
so the motor’s rotation will not be affected by the Talon SRX.
An added feature of the Talon SRX is its ability to toggle between Brake & Coast modes during
operation using CAN bus.
2.1.1. Switching Between Brake & Coast Using the B/C CAL
Button:
To switch between Brake and Coast mode, simply push the B/C CAL button at any time. The Talon
SRX is in Brake mode when the button is illuminated red and Coast when the red light is turned off.
Brake/Coast settings are saved even if power is removed from the Talon SRX.
2.1.2. Switching Between Brake & Coast Using CAN bus:
Use the roboRIO Web-based Configuration page for CAN selection between Brake and Coast Modes.
2.1.3. Switching Between Brake & Coast Using CAN Control
Frames
Each supported programming language includes an API that allows active switching between Brake &
Coast modes during a match. See Software Reference Manual for more information.
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