I'm sorry but I don't have any information on the communication protocol for that device. What can you tell us about that ?
If you bought it you must have a manual . Can you provide some information from the manual ?
I'm not sure if we can help someone hack a security keypad. There are legal issues . I'm sure you understand. We don't know who you are or why you are trying to hack this security access keypad. This whole post is very suspicious. I am almost inclined to forward a link to this post to the FBI just on general principles. I might need to notify the Global Moderator so he can get your IP address for the records in case the FBI ask us later.