Writing a triangular waveform to serial port

Hello, 

I would like to send triangular waveform on a serial port say at 30ms period.  what should be best option to do this. Can we use simulate signal vi and then wiring this directly to serial write VI . 

or should we must place inside a while loop and place wait until next ms vi to control the sample period .

the objective is to tight ms period in between data points.

regards,