Hi, all. i have beening trying to use the control register and the status register as parallel port input. i have read the article named "Using the Parallel Port in LabVIEW" at the address "http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596?opendocument"; i did exactly what it told me to do. program the control signals c3,c2,c1,c0 to logical high first(that is 0100 in binary), and then try to read these control signals back. these pins are exteranlly connected to my circuit.
but no matter how i change the external signal level(0 and 1), the values i read in are always the same as the values i write to the control register(0100 in this case), can anyone tell me why? please!!
