Batboard

Hiya, first off this is my first post here, so let me know if I did something wrong. I am trying to setup a repeater that supports the MDC1200 repeater access that HT1000s have and such. I am not talking about basic access control of a repeater by requiring an MDC burst to unlock it, but the RAT configuration a lot of older portables have. I know that it uses MDC1200 to request access, and the repeater acknowledges it, however I cannot find any information on how this works anywhere. If anyone has an idea of where to start on getting this to work that would be great, I just have always wanted to mess with that kind of mdc access.
Thanks!