Bl-2600 A/D Start Conversion ?

I have been trying to evaluate which board I want to get for a specific project. One thing I have not been able to see referenced in ANY documentation is how one can control when an A/D conversion starts. I need to start conversion with an external signal, and would like an interrupt or i/o signal to indicate end of conversion. Is there any docs on these boards, or some indication in Dyamic C for functions to do this ?