imaqio (fpga) PCIe 8255R read/write control ISO input

[Jason_col]

Hi. I have an external trigger connected to ISO INPUT 5 on my PCIe 8255R which has an fpga RIO (see manual). I  want to read the value of ISO INPUT 5  using Read/Write control vi on Labview but this vi doesn't show that input (it shows iso inputs from 6 to 11). I'm using the default IMAQIO bitfile that comes in the installation directory to open the FPGA. What should I do?. Thanks in advance.