Hardware Configuration and Installation Chapter 2
STD-GPIB for Windows 2-6 © National Instruments Corp.
Selecting the Base I/O Address
STD/STD32 computers have a segment of address space reserved for input and output.
This segment is referred to as the I/O address space. The base I/O address of an
STD/STD32 module such as the STD-GPIB is the first position in the I/O address space
occupied by the STD/STD32 module.
By default, the STD-GPIB is configured to use base I/O address 2C0 hex. With this
setting, the module uses the I/O address space 2C0 hex through 2DF hex. If this address
range is already in use by another device or if you are installing more than one
STD-GPIB, follow these steps to reconfigure the base I/O address setting.
1. Choose a new base I/O address setting.
You can configure the base I/O addresses to any setting between 0x100 and 0x3E0
that is a multiple of 0x20 hex. If you are installing more than one STD-GPIB, each
module must use a unique base I/O address.
Table 2-2 lists the possible switch settings, the corresponding base I/O addresses,
and the I/O address space used for each setting. The default settings are in bold
italics.
Table 2-2. Possible Base I/O Address Switch Settings
Switch Setting
A9 A8 A7 A6 A5 Base I/O
Address (hex) I/O Address Space
Used (hex)
01000 100 100 to 11F
01001 120 120 to 13F
01010 140 140 to 15F
01011 160 160 to 17F
01100 180 180 to 19F
01101 1A0 1A0 to 1BF
01110 1C0 1C0 to 1DF
01111 1E0 1E0 to 1FF
10000 200 200 to 21F
10001 220 220 to 23F
10010 240 240 to 25F
10011 260 260 to 27F
10100 280 280 to 29F
(continues)