Sync 9215 ai and 9263 ao in cDaq-9174 chassis

I have a cDAQ-9174 chassis with 9215 ai, 9263 ao, 9481 relay and 9211 temperature modules.  

I develop in C++ with the NI-DAQmx ANSI C lib.

Is there a way to sync ai and ao without, say, a hardware digital line to trigger both?  I've used DAQmxCfgDigEdgeStartTrig on other systems but neither 9215 nor 9263 appears to have the hardware for that, so I'm hoping for another solution ?  

Any help would be appreciated!

Piet