If you are writing your own software then contact Kevin a Applied Digital. Phone is: 417-598-9605. Their website is
www.appdig.com or click here and they may have a contact method there too. Kevin will be able to give your programmer the protocol to configure your software. You will need to purchase a T-Max manager to interface with the computer and the Versa Spa has the timer built in which is already compatible with the Manager (since Applied Digital builds it for them).
Hope this helps.