How to communicate with Arbitrary Waveform Generator through Simulink?

Hi, I am new to instrument control toolbox. I want to send a pn sequence to Keithley 3390 arbitrary waveform generator (AWG) using simulink blocks. I have seen a couple of examples on how to connect simulink to a instrument, but they don't work with this generator. The AWG displays "remote error in commands". I used NIVisa USB interface created on MATLAB workspace. I need help specifically connecting simulink model to a Arb. waveform generator. So that the pn sequence can be saved in the AWG for later use. Thank you. Your help is greatly appreciated!