murat

Hi, I have written the LabVıew code in the attachement for sending signals through parallel port. There is no problem with the signals, I can on-off the LEDs in the circuit repeatedly. But, I have problem with the frequency. Even if the loop is working at its highest frequency, I can not see a on-off switching of the LEDs more than approximately 0.5 Herz. Every shifting of the signal from one value to another becomes 2 seconds at a time. How can I increase the frequency of this operation??? Take care Murat