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Glossary
VXI-USB User Manual G-4 ni.com
dynamically
configured device
A device that has its logical address assigned by the Resource Manager.
AVXI 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.
E
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.
F
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
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.