Designed to meet the requirements of Appendix U of the RRS for Audio-Signal Racing System (ASRS) i.e. sound signals only.

Note that ASRS countdown can only be used for single fleet, single start races

Use the Settings Screen, under Race Type - Starting Sequence to select ASRS Countdown

To control the countdown, the app uses a text file with the format:

M:SS RS or M:SS RSRS

Where:
M:SS is the time of the required signal - e.g. 0:30, would signal at 30 seconds to start

  R is the number of times this signal is repeated - example 1, 2, 3, up to 9

S is the signal type, which can only be:

A - Attention  - about 250ms

S - Short - about 500ms

L - Long - about 1s

Example entries:

3:10 5A (five attention i.e. very short)

3:00 3L (three long)

1:30 1L3S (one long and three short)

Upon first use of the DSRC app, it will check if there is and existing ASRS_Countdown file, and if one is not found a default set (as listed in Appendix U) will be created.  This can be changed using the editor.

The editor also contains a 'Reset' button, which if press will reload the dafault set.

One thing to note - Loading the required sounds seems to take a few second to initialise after the app displays the Race Screen. 

This shouldn't be  a problem, unless you press Start immediately after entering the Race Screen (doesn't crash, just might miss or cut short the first signal). I would suggest waiting for at least 10 seconds after entering Race Screen before pressing Start.