Does anyone know how to send SERIAL Characters from MATLAB?

The catch is, we are trying to send BYTES above 127 (Extended ASCII) and the usual %c formatter while using CHAR(133) for example, does not actually send the byte "133".

Relevance is: Students working on an APRS satellite project. I can do it EASILY from all kinds of other devices, but the professor insists on using MATLAB syntax.

Thanks

Bob, WB4APR