As eaolson said a DAQ is not intended to control devices. However it is an interesting project to enter the guts of the communication protocol. Doing it with a DAQ would require to:
- Identify the protocol (GPIB or RS-232)
- Make your cable from the DAQ output connector
- For each command, generate the waveform in LabVIEW, by using the letters' ASCII code, stop bits, etc. This is the funniest part (INMHO, but I understand it's not everybody!)
- Send it (using DAQ analog write VIs, you should find many examples for this)
- The oscilloscope will be your best friend