Hi Sushi,
The first thing to investigate is whether the PC's parallel port can actually drive that many relays due to loading conditions. Check out the specs of your PC's bus versus the loading requirements (typically mA) for a given relay.
As for controlling the relay using the parallel port, you can have a look at the example provided by Labview by searching within the Help menu, under "Find Examples", then search "parallel port". Although reading & writing to the parallel port is relatively easy, the nice thing with the examples is that it provides information on each line of the port (data vs control, etc). I also posted an attachment a few years ago on how to set up the port. This was used to open / close relays.. I will look for the thread.
Regards,
JLV
