How to formally specify an arbitrary array for PLUTO SDR transmission?

Hi,

I am trying to setup a comm. system with ADLAM PLUTO SDR. I have a doubt regarding 'SamplesPerFrame' of the source data, for example:-

sine = dsp.SineWave('Frequency',3000,...
                    'SampleRate',rx.BasebandSampleRate,...
                    'SamplesPerFrame', 2^15,...
                    'ComplexOutput', true);

For a sine wave, this value can be set with dsp object. How can I set this for an arbitrary array of complex numbers that I want to transmit? I tried dsp workspace object which does not have all these parameters. So the question is how can one formally specify an arbitrary array of complex numbers for transmission through PLUTO SDR?