Thanks Rick and Darrell.
I'm in Robina so perhaps I could pop up and see you Darrell when it's convenient for you. Please let me know.
I assume the key pad is compatible but here's a picture of the connector for comparison.
Key Pad Connector
Thanks Paul for the suggestion. I should have mentioned that the mount works fine through TheSkyX. It's just the key pad that's playing up. That could either be a key pad issue or something in the mount's controller specific to the key pad operation. I'm hoping it's the key pad.