Chapter 4
Nonvolatile Configuration
4-4
ni.com
The first four sections display the National Instruments-reserved variables.
The last section displays hexadecimal values representing the contents of
the user-defined variables. In this example, no user-defined variables have
been initialized.
The following sections describe the fields in the Nonvolatile Configuration
Information Display.
Logical Address
This field contains the VXI logical address of the GPIB-VXI/C. It specifies
the location of the GPIB-VXI/C registers in VXI A16 space. The formula
is as follows:
C000h + (40h * Logical Address)
If the Logical Address is set to 0, the GPIB-VXI/C will attempt to be the
VXI Resource Manager. If the Logical Address is set in the range of 01 to
FEh (1 through 254), the GPIB-VXI/C is set up to be a Static Configuration
(SC) Message-Based (or possibly Register-Based) device. If the Logical
Address is set to FFh (255), the GPIB-VXI/C is set up to be a Dynamic
Configuration (DC) Message-Based (or possibly Register-Based) device.
The factory setting is Logical Address 0.
Device Type
You can set up the GPIB-VXI/C to be either a Message-Based or a
Register-Based VXI device. Normally, the GPIB-VXI/C should be a
Message-Based device. In Register-Based mode, however, the
GPIB-VXI/C can reside virtually transparently in the VXI system for use
as a debugging tool. It can still access the VXIbus directly as a bus master,
perform Word Serial operations and GPIB transactions, and use Code
Instruments. None of the functionality is removed; however, the Resource
Manager does not grant any Servants to a Register-Based GPIB-VXI/C.
Manufacturer Id
The Manufacturer Id is set at the factory and cannot be changed.
Manufacturer Ids are assigned by the VXI Consortium. The Manufacturer
Id for National Instruments is FF6h.
Model Code, Slot 0/Non-Slot 0
You can configure the GPIB-VXI/C for either Slot 0 or Non-Slot 0
operation. According to the VXIbus specification, a device configured to
be in Slot 0 must have a Model Code between 000h and 0FFh. A device
