National Instruments 321042A-01 사용자 설명서
Hardware Configuration and Installation
Chapter 2
STD-GPIB for Windows
2-12
© National Instruments Corp.
IRQ 5
IRQ 6
IRQ 9
IRQ 14
IRQ 10
W1
IRQ 11
IRQ 12
W2
IRQ 5
IRQ 9
IRQ 7
IRQ 10
IRQ 11
IRQ 12
IRQ 14
IRQ 15
Ziatech
WinSystems
Figure 2-7. Jumper Setting for Disabling Interrupts
4.
Record your new setting on the STD -GPIB Hardware and Software Configuration
Form in Appendix C, Customer Communication.
Form in Appendix C, Customer Communication.
5.
Remember that after you install the NI-488.2 software, you must use the GPIB
software configuration utility to configure your software settings to match your new
hardware settings. Refer to the Configure the Software section in Chapter 3,
Software Installation and Configuration , for more information.
software configuration utility to configure your software settings to match your new
hardware settings. Refer to the Configure the Software section in Chapter 3,
Software Installation and Configuration , for more information.
Selecting the DMA Channel
Direct memory access (DMA) refers to data transfers directly to or directly from devices
such as the STD-GPIB and system memory. Your GPIB hardware and the NI-488.2
software are designed to perform DMA. In most cases, data transfers using DMA are
significantly faster than programmed I/O transfers, which use more CPU time.
such as the STD-GPIB and system memory. Your GPIB hardware and the NI-488.2
software are designed to perform DMA. In most cases, data transfers using DMA are
significantly faster than programmed I/O transfers, which use more CPU time.
The STD-GPIB is able to perform DMA transfer through the use of a frontplane DMA
connector. By default, the STD-GPIB is configured to use DMA channel 5. If this is not
an acceptable setting, or if you are installing more than one STD-GPIB, follow these
steps to reconfigure the DMA channel.
connector. By default, the STD-GPIB is configured to use DMA channel 5. If this is not
an acceptable setting, or if you are installing more than one STD-GPIB, follow these
steps to reconfigure the DMA channel.
Note: The STD-GPIB supports only 16-bit DMA transfers. If your CPU board does
not support 16-bit DMA transfers, you must disable DMA. Refer to Figure 2-9,
which shows how to set the DMA jumpers for no DMA.
which shows how to set the DMA jumpers for no DMA.