Hi mana111,
Are you using LabVIEW or Measurement Studio in this application? How do you have the output from the parallel port wired to these indicators? ( maybe post a screenshot of your code).
Regards,
Matt S.
LabVIEW Integration Engineer with experience in LabVIEW Real-Time, LabVIEW FPGA, DAQ, Machine Vision, as well as C/C++. CLAD, working on CLD and CLA.