Theory; Introduction; System Configuration - IBM 5251 11 Maintenance Information Manual

Introduction
The IBM 5251 Model 11 Display Station is a tabletop,
online work station for data entry or interactive display
functions. The display station contains a display screen
for displaying data, a keyboard for data entry, a control
unit that contairrs storage, and a cable adapter for
communication with a controller.
SYSTEM CONFIGURATION
The following figure shows a configuration of a 5251
Model 11 Display Station attached to a controller at a
system location. The number of display stations
attached to this system is specified during system
configuration for the customer's application. Display
stations and printers can be attached in a point-to-point
configuration, or can be attached in a series
configuration by means of a Cable Thru feature on each
work station in the configuration.
Display stations rely on a controller and a system. Data
entered at the keyboard
D
is moved into the
microprocessing unit, to the cable adapter, and serially
shifted on the system cable to the controller
B.
The
controller receives the data, translates it
II
or sends it
on to the system
II.
The data is then returned to the
display station to be displayed
II.
Theory
Theory 5251 MIM 4-1