Chapter 2
Hardware Configuration and Installation
© National Instruments Corp.
2-3
GPIB-PCIIB/MS-DOS
Base I/O Address Selection
The GPIB-PCIIB is programmed by the CPU by reading and writing eight
consecutive addresses on the I/O channel. The base I/O address for the
GPIB-PCIIB is determined by the switches at position U22. The switches
are set at the factory for the I/O address 2B0 hex. The GPIB-PCIIB uses
the I/O address space 2B0 through 2BF hex with this setting.
Note:
Check to determine that this space is not already used by other
equipment installed in your computer. If any equipment in your
computer uses this I/O address space, change the base I/O
address of either the GPIB-PCIIB or the other device. If the
GPIB-PCIIB I/O address is changed, make a corresponding
change to the GPIB-PCIIB software as described in the Step 3.
Configure the Software section of Chapter 3.
Press the side marked OFF to select a binary value of 1 for the
corresponding address bit. Press the ON side of the switch to select a
binary value of 0 for the corresponding address bit. Refer to Figure 2-2.
Figure 2-2 shows two possible switch settings. In this figure, the black side
of the switch is the side you press down. Each of the address selections
shows how the base I/O address was calculated from the switch positions.