National Instruments 6509 Programmer's Manual page 46

Glossary
I
isolation
L
LSB
M
MSB
O
optical isolation
optocoupler
P
PCI
port
PXI
Static DIO Register-Level Programmer Manual
signal conditioning to break ground loops and reject high common-mode
voltages to protect equipment and users and to ensure accurate
measurements
least significant bit
most significant bit
the technique of using an optocoupler to transfer data without electrical
continuity, to eliminate high-potential differences and transients
a device that transfers electrical signals by utilizing light waves to provide
coupling with electrical isolation between input and output
Peripheral Component Interconnect—a high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA
a digital port, consisting of eight lines of digital input and/or output
PCI eXtensions for Instrumentation—an open specification that builds on
the CompactPCI specification by adding instrumentation-specific features
G-2 ni.com