There is a problem with UC Surface 2.0 and FireWire at the moment, so don't use UC 2 on your Mac. But you may use it on iPad. UC 2 and 1 work perfect together. You need this versions of firmware and software:
AI Console Firmware v9194
Universal Control 1.8 (Mac/PC) 188.8.131.52882
UC Surface 1 (iOS) 184.108.40.206882
Capture (Mac/PC) 220.127.116.11252
For iPad and iPhone you can use:
UC Surface (iOS) - 18.104.22.168902
QMix-UC (iOS/Android) - 22.214.171.124911
The download page is: http://www.presonus.com/support/downloads/StudioLive-3242AI.
Hope this helps.