Check that the molded plug on the camera end is fitting correctly, a lot of the chinese copies have a problem with the molding that prevents the pins making contact.
Also if you do get it working don't forget to install a timer circuit between the chrony and camera to give you some fine control. Typical timing resolution needs to be less than a millisecond I use a digital system that is accurate to a microsecond, roughly 1 millisecond = 1 foot of pellet travel (1000 fps, high but it makes it easy to remember lol).
regards
Kev