The SerialPortBaudRateEnum enum defines possible baud rates for the serial ports on the Beaglebone Black.
public enum SerialPortBaudRateEnum { BAUDRATE_0, BAUDRATE_50, BAUDRATE_75, BAUDRATE_110, BAUDRATE_134, BAUDRATE_150, BAUDRATE_200, BAUDRATE_300, BAUDRATE_600, BAUDRATE_1200, BAUDRATE_1800, BAUDRATE_2400, BAUDRATE_4800, BAUDRATE_9600, BAUDRATE_19200, BAUDRATE_38400, BAUDRATE_57600, BAUDRATE_115200, BAUDRATE_230400, BAUDRATE_460800, }