It's main function is to help with focusing, but for long exposure stuff it can also control the bulb setting with a custom cable (similar to this one).
Circuit diagrams are available on the support page of the website, for both Parallel and Serial versions (useful if you have your telescope controlled via the serial port already)
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For astrophotographers, have a look at DSLRFocus
http://www.dslrfocus.com/
It's main function is to help with focusing, but for long exposure stuff it can also control the bulb setting with a custom cable (similar to this one).
Circuit diagrams are available on the support page of the website, for both Parallel and Serial versions (useful if you have your telescope controlled via the serial port already)