Change Counter Output Terminal in Data Acquisition Toolbox NI

I have a square wave clock provided by an external timing device synchronized to a pulsed laser. I have some labview code which configures a counter output timed pulse channel on my NI DAQ Card. The channel is triggered by the external device by watching a PFI channel and sents the counter output pulse over RTSI to trigger a frame grabber to acquire a synchronised image from a camera.

I'm transitioning thise code over to Matlab.

When I create a counter output in the Matlab version, the "Terminal" property of the resultant object is defined at creation and is protected. For counter 0 it defaults to PFI12, how can I change this to output over RTSI as I can in labview? Is there a good reason this is protected?

Alternatively, is there a smarter way to send an external clock through the DAQ board over RTSI?

Thanks in advance for any help!