Thank you very much for your reply. I have tried using the select input. The problem that I see is that when I do that, them both Square Wave Generators use the same parameters (frequency, phase, etc), thus I see no difference in my output wave. Note that both Square Wave Generator VIs live under the same loop and both are using Outside Single Cycle Timed Loop as the Execution Mode.
I am not quite sure what I am missing, I hope you can help.
Thanks for the help in advanced.
A FSK signal is based on the premise that you represent zero's and one's in your data with two different frequency signals. So in your case your two Square Wave Generators need to have different frequencies, most likely multiples of one another in order to maintain phase continuity in your output signal.
One common example of a FSK signal is the analog modem used by computers and fax machines. The chirping you hear when a fax or old time modem connects is the two different frequencies of the analog FSK signal.
A picture of a FSK signal based on binary data is shown in Figure 5 of the following appplication note.
The example discussed in this thread is used to generate a FSK signal using NI HW. It does not use any thrid party components, and we do not have experience using third party HW for this purpose.
If you are looking for a Bellcore 202 decoder I would suggest searching using Google and contacting vendors that supply these types of components.