Hi CieloBlue,
From a quick review of the iOptron manual, it looks like this 12V output is meant to power the LED for the polar scope. My older CEM60 has a similar connection, although the voltage is not labelled. Given that there is no current output rating on this 12V connection and the barrel jack may be the wrong size, I would avoid trying to power an ASI Air from this connection. The Air may need a lot more current than the CEM26 can provide which will cause problems for your mount electronics.
CS,
Bob