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

Introduction
The IBM 5251 Display Stations Models 1 and 11 are
tabletop, online work stations that are used for data
entry or interactive display functions .. The display station
contains a display screen that displays data, a keyboard
that is used to enter data, a control unit that contains
storage, and a cable adapter that handles the
communications between the controller and the display
station.
The Model 1 displays up to 960 characters in 12 rows
of 80 characters each. These 12 rows are interspersed
by 12 blank rows that improve readability.
The Model 11 displays up to 1920 characters in 24 rows
of 80 characters each.
SYSTEM CONFIGURATION
The following figure shows a configuration of a 5251
Display Station Model 1 or 11 attached to a controller at
a system location. The number of display stations that
are attached to the system is specified during system
configuration. Display stations and printers can be
attached in a point-to- point configuration, or they can
be attached in a series configuration by means of a
Cable Thru feature that is installed on each work station
in the configuration.
Display stations rely on a controller and a system. Data
entered at the keyboard" is moved to the
microprocessing unit, and then to the cable adapter; the
data is then serially shifted on the system cable to the
controller
II.
After the controller receives the data, it
translates it
II
or sends it to the system
II.
The data
is then returned to the display station where it is
displayed
II.
Theory
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Theory 5251 MIM 4-1