User Manual (Vantage & Pro)
User Manual for the Vantage and Pro versions of the Vesta.
User Manual (Classic)
This is a good place to start. It covers setup and configuration of the Vesta.
In-depth documentation of the Vesta rules with examples.
Custom GUI creation is a more advanced topic - not required reading.
Connectors and Pinouts
In most cases, you won't need to deal with the signals on the individual pins of the Vesta connectors or make your own cables. However, they're documented here.
Detailed specifications for Vesta system components can be found here.