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Chapter 2
Installation and Configuration
©
National Instruments Corporation
2-13
Figure 2-10 shows the jumper position for selecting no DMA channel.
Figure 2-10. AT-GPIB/TNT DMA Jumper Setting for No DMA Channel
Setting the AT-GPIB/TNT Shield Ground
Configuration
The AT-GPIB/TNT is set at the factory with the jumper in place to
connect the logic ground of the AT-GPIB/TNT to its shield ground.
This configuration minimizes EMI emissions.
Caution:
The AT-GPIB/TNT was tested for compliance with FCC standards with the
shield ground connected to logic ground. Removing the jumper might
cause EMI emissions to exceed any or all of the applicable standards.
If your application requires that logic ground be disconnected from
shield ground, follow these steps:
1.
Refer to Figure 2-5 to locate the shield ground jumper W3 on the
AT-GPIB/TNT.
2.
Remove the jumper and place it across only one of the jumper pins,
as shown in Figure 2-11.
DRQ7
DACK7
DRQ6
DACK6
DRQ5
DACK5
15
14
12
11
10
IRQ
= Used to Select the IRQ Level
!