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Chapter 2
Installation and Configuration
©
National Instruments Corporation
2-11
Follow these steps to reconfigure the interrupt request line:
1.
Find the jumpers that set the interrupt request line. The jumpers are
located on the lower edge of your AT-GPIB/TNT. Refer to the parts
locator diagram, Figure 2-5.
2.
Change the jumper settings to configure the AT-GPIB/TNT to the
new interrupt request line.
To use lines 10, 11, 12, or 15, use the jumper block shown in
Figure 2-7. To use interrupt lines 3, 4, 5, 7, or 9, use the jumper
block shown in Figure 2-8.
Figure 2-7 shows the setting for IRQ11.
Figure 2-7. AT-GPIB/TNT Interrupt Jumper Setting for IRQ11 (Default Setting)
Figure 2-8 shows the setting for IRQ5.
Figure 2-8. AT-GPIB/TNT Interrupt Jumper Setting for IRQ5
Configure the AT-GPIB/TNT Direct Memory Access
Direct memory access (DMA) refers to data transfers directly to or
directly from devices such as the AT-GPIB/TNT and computer
memory. Your GPIB hardware and software are designed to perform
DMA. Programmed I/O transfers use more CPU time. However, if
Windows is unable to assign a DMA resource to the AT-GPIB/TNT,
you can configure DMA to none and still use the GPIB software. By
default, the AT-GPIB/TNT is configured to use DMA channel 5.
DRQ7
DACK7
DRQ6
DACK6
DRQ5
DACK5
15
14
12
11
10
IRQ
= Used to Select the DMA Channel
IRQ3
IRQ9
3
4
5
6
7
9