Chapter5 ATSerial Hardware Installation, Verification, and Configuration
©NationalInstruments Corporation 5-25 SerialHardware and Software for Windows
ATBoards (Shared IRQ)Figure 5-12 shows the PnP Port Configuration dialog box for an
AT-232/4 withshared IRQ . The dialog boxesfor other shared IRQ AT
boards are similar.
Figure5-12. PnPPort Configuration Dialog Box for the AT-232/4
Eachshared IRQ ATboard requires multiple base I/O settings(onefor each
port)an d one IRQ that is shared between the ports.
Input/OutputRange: Each Input/OutputRange listing
displays the I/O address ranges assigned
to the corresponding port on the board.
InterruptRequest: TheIRQ shared between the ports on the
board.
Note The niports utility informs you if your resources conflict with the resources of any
otherinterface in the system .It do es not check for conflicts with ports on the same board.
Makesure to assign base I/O addresses that do not co nflict with those assigned to another
porton the same board.