Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 160)

Glossary
Appendix D
DĆ2
Command line: The command and any other input needed to
execute the command properly.
Command mode: Direct operation of the 1775-S4B scanner
through data terminal keyboard input. The prompt S4B> cues
the user for input.
CRT terminal: A terminal containing a cathode ray tube used
to display programs, reports, or user input.
Cursor: A means for indicating on a CRT screen where data
entry or editing occurs.
Data: A general term for any type of information.
Data table: The part of the PLC-3 memory that contains
current I/O values, files, etc., where data is monitored,
manipulated, operated upon, and changed for control purposes.
Data terminal: A device used only to send or receive data.
Decimal: Pertains to the base-10 numbering system.
Display: The image which appears on a CRT screen.
Duplex: A means of two-way data communication. See full-
duplex and half-duplex.
Echo: A portion of the transmitted signal returned from the
start point to the source with sufficient magnitude and delay to
cause interference.
Edit: To deliberately modify a procedure.
Execution: The performance of a specific operation that is
accomplished through processing one instruction, a series of
instructions, or a complete program or procedure.
Full duplex: A bi-directional mode of communication where
data may be transmitted and received simultaneously.
Floating point value: A fractional (fixed point) or
exponential value. These values can be stored in the floating
point section of the data table.
Function: An auxiliary command that works with a report
generation command to specify how a command line should
execute.