National Instruments 321042A-01 Benutzerhandbuch
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.
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.
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.
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.
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)
0
1
0
0
0
100
100 to 11F
0
1
0
0
1
120
120 to 13F
0
1
0
1
0
140
140 to 15F
0
1
0
1
1
160
160 to 17F
0
1
1
0
0
180
180 to 19F
0
1
1
0
1
1A0
1A0 to 1BF
0
1
1
1
0
1C0
1C0 to 1DF
0
1
1
1
1
1E0
1E0 to 1FF
1
0
0
0
0
200
200 to 21F
1
0
0
0
1
220
220 to 23F
1
0
0
1
0
240
240 to 25F
1
0
0
1
1
260
260 to 27F
1
0
1
0
0
280
280 to 29F
(continues)