National Instruments VXI-USB User Manual

dynamically 
configured device

A device that has its logical address assigned by the Resource Manager. 
A VXI device initially responds at Logical Address 255 when its MODID 
line is asserted. The Resource Manager subsequently assigns it a new 
logical address, to which the device responds until powered down.

ECL

Emitter-Coupled Logic

EEPROM

Electronically Erasable Programmable Read Only Memory—ROM that 
can be erased with an electrical signal and reprogrammed.

embedded controller

An intelligent CPU (controller) interface plugged directly into the VXI 
backplane, giving it direct access to the VXIbus. It must have all of its 
required VXI interface capabilities built in.

EMC

electromagnetic compliance

EMI

electromagnetic interference

external trigger

A voltage pulse from an external source that triggers an event.

fair requester

A VXIbus device that will not arbitrate for the VXIbus after releasing 
it until it detects the bus request signal inactive. This ensures that all 
requesting devices will be granted use of the bus.

firmware

Software embedded in the VXI-USB, contained on EEPROM and flash 
memory that can be updated with a special utility (part of MAX). In 
combination with the hardware, the firmware enables the VXI-USB to act 
as a translator between USB and VXI protocols.

g

(1) grams
(2) a measure of acceleration equal to 9.8 m/s

2

GPIB

General Purpose Interface Bus (IEEE 488)

g

RMS

A measure of random vibration. The root mean square of acceleration 
levels in a random vibration test profile.