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Chapter 5 Peripherals
VXIpc-850 Series User Manual
5 - 10
© National Instruments Corporation
memory operations. A 64- byte FIFO allows the 53C810 to support up
to 16 longword bursts across the PCI interface.
SCSI signals require termination at each end of the network. The
VXIpc-850 provides automatic termination networks (two TL2218
chips from Texas Instruments) that you can disable via a jumper
setting; however, you should not need to do this since the VXIpc-850
should be the controller (and therefore on the end) for any SCSI
network connected to it.
GPIB (IEEE 488.2)
The VXIpc-850 uses the National Instruments TNT4882C ASIC,
providing the VXIpc-850 with a full GPIB Talker/Listener/Controller
functionality. This ASIC gives the VXIpc-850 complete compatibility
with the National Instruments AT-GPIB/TNT. In fact, the default base
address, interrupt level, and DMA level are the same on the VXIpc-850
as they are on the AT-GPIB/TNT.
Because of this compatibility, included with your VXIpc-850 kit are the
same manuals usually sent with an AT-GPIB/TNT kit. They explain
how to get your GPIB system up and running.
Base Address, DMA, and IRQ Configuration
Although the VXIpc-850 hardware is compatible with the
AT-GPIB/TNT, you do not have the option to change the base address
or the DMA level of the GPIB circuitry on the VXIpc-850.
•
The base I/O address is 2C0
•
The DMA level is 5
•
The IRQ is 11 (you can also select an IRQ of 5)
The hardware installation and configuration information in the GPIB
getting started manual is not relevant to the VXIpc-850.
Installing the NI-488.2 Software
Because the VXIpc-850 comes with the NI-488.2 software already
installed on it, you do not need to read the software installation chapter.
The rest of the GPIB getting s tarted, user, and function reference
manuals contain information about how to configure and use your
GPIB system.