Rockwell Automation 5370 CVIM Communications Manual User Manual

Page 198

Bulletin 5370 CVIM

Glossary

Configurable Vision Input Module

G–3

PLC
Allen-Bradley trademark for
programmable logic controller.

Q–bus
A set of electrical conductors that
carry specific signals to several other
circuits.

RS–232
Standard electrical interface.

standard deviation
A measure of the dispersion around a
mean value.

serial port
A communications connector
through which data is transmitted
one bit at a time.

space character
A graphic character that is usually
represented by a blank site in a series
of graphics. The space character,
though not a control character, has a
function equivalent that of a formal
effect or that causes the printer or
display to move one position forward
without producing the printing or
display of any graphics.

string
A sequence of ASCII characters.

subroutine
A series of computer instructions
which perform a specific task for
other routines. It is distinguishable
from from a main routine in that it
requires as one of its parameters a
location specifying where to return to
the main program after its function
has been accomplished.

TTL
A signal processing system in which
data in the form of low level
electrical signals is processed
through circuits either discretely or
through integrated circuits comprised
primarily of transistors.

word
A unit of data which contains two
bytes (16 bits).