Calculate FPS and configure break time

The device currently responds that it can process DMX data as fast as possible, but this hasn't been tested. The intial data rate and FPS should be user configurable or calculated with the baud rate. The library currently does not respond to settings from the PC to override the data rate (label 4).
https://dol2kh495zr52.cloudfront.net/pdf/misc/dmx_usb_pro_api_spec.pdf