Glossary
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National Instruments Corporation
G-3
NI PCI-7342 Hardware User Manual
Axis <1..2> Home
Input
axis 1 through 2 home input
Axis <1..2> Reverse
Limit Input
axis 1 through 2 reverse/counter-clockwise limit input
B
b
bit—one binary digit, either 0 or 1
base address
memory address that serves as the starting address for programmable or
I/O bus registers. All other addresses are located by adding to the base
address.
binary
a number system with a base of 2
buffer
temporary storage for acquired or generated data (software)
bus
the group of conductors that interconnect individual circuitry in a computer.
Typically, a bus is the expansion vehicle to which I/O or other devices are
connected.
byte
eight related bits of data, an eight-bit binary number. Also used to denote
the amount of memory required to store one byte of data.
C
CCW
counter-clockwise—implies direction of rotation of the motor
closed-loop
a motion system that uses a feedback device to provide position and
velocity data for status reporting and accurately controlling position and
velocity
common
reference signal for digital I/O
CPU
central processing unit
crosstalk
an unwanted signal on one channel due to an input on a different channel
CSR
Communications Status Register
CW
clockwise—implies direction of motor rotation
