Lear Siegler ADM 5 User manual

ADM 5
Dumb Terminal®
Video Display
MAINTENANCE MANUAL

TABLE OF CONTENTS
SECTION PAGE
I GENERAL DESCRIPTION ............................................... 1-1
1.1 INTRODUCTION ..................................................... 1-1
1.2 PURPOSE AND USE ................................................. 1-1
1.3 PHYSICAL DESCRIPTION ........................................... 1-1
1.4 OPERATIONAL DESCRIPTION ........................ , ............. 1-2
1.4.1 Keyboard ....................................................... 1-2
1.4.2 Input/Output (110) Port ........................................ 1-2
1.4.3 ADM 5 Control Logic ........................................... 1-2
1.4.4 Display Memory ................................................ 1-2
1.4.5 CRT Display Monitor ........................................... 1-2
1.5 SPECIFICATIONS ..................................................... 1-2
1.5.1 Send/Receive Modes ............................................ 1-2
1.5.2 Character Format (Figure 1-3) ................................... 1-8
1.5.3 Word Structure .......................................... , ...... 1-8
1.5.4 Data Entry and Overflow ....................................... 1-8
1.5.5 Configuration Control .......................................... 1-8
1.6 OPTIONAL FEATURES .............................................. 1-8
1.6.1 Answerback .................................................... 1-8
1.6.2 20mA Current Loop on Extension Port .......................... 1-8
1.6.3 230 VAC ........................................................ 1-8
1.6.4 Alternate Configuration -Green Phosphor
Screen .......................................................... 1-8
1.7 RELATED DOCUMENTS ............................................. 1-8
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TABLE OF CONTENTS (cont'd)
SECTION
PAGE
II INSTALLATION ........................................................... 2-1
2.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .. 2-1
2.2 SPECIAL SAFETY REQUIREMENTS ................................ 2-1
2.3 UNPACKING AND INITIAL INSPECTION .......................... 2-1
2.4 SITE REQUIREMENTS ............................................... 2-1
2.5 INITIAL PREPARATION .............................................. 2-2
2.5.1 Line Voltage Selection .......................................... 2-2
2.5.2 Configuration Control Switch Settings .......................... 2-2
2.5.3 Access to Configuration Control Switches ....................... 2-2
2.6 INTERFACE INFORMATION ........................................ 2-4
2.6.1 RS-232C Modem Port Interface .................................. 2-4
2.6.2 RS-232C Extension Port Interface ............................... 2-4
2.7 INSTALLING THE ADM 5 ........................................... 2-10
2.8 POWER TURN-ON AND TURN-OFF ................................. 2-10
2.9 CARE OF THE ADM 5 ............................................... 2-10
2.9.1 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .. 2-10
2.9.2 Inspection .................................................... 2-10
III OPERATION ............................................................... 3-1
3.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1
3.2 KEYBOARD OPERATION ............................................ 3-1
3.2.1 Terminal Control Keys .......................................... 3-1
3.2.2 Alphanumeric Keys ............................................. 3-4
3.2.3 Special Character Keys ......................................... 3-4
3.2.4 Operational Control Keys ....................................... 3-4
3.3 CURSOR CONTROL OPERATIONS .................................. 3-4
3.4 DATA EDITING CONTROL OPERATIONS ........................... 3-7
ii DP319

TABLE OF CONTENTS (cont'd)
SECTION PAGE
3.5 DATA TRANSMISSION CONTROL ................................... 3-7
3.5.1 BREAK Key .................................................... 3-7
3.5.2 TAB Key ....................................................... 3-7
3.6 PROGRAMMING CONSIDERATIONS ................................ 3-7
3.6.1 CONTROL Key ................................................. 3-7
3.6.2 ESC Key ....................................................... 3-7
3.6.3 PROG Key ...................................................... 3-7
3.6.4 HERE IS Key ................................................... 3-7
3.7 INTERFACE CONTROL OPERATIONS .............................. 3-8
3.7.1 Data Communication Ports ..................................... 3-8
3.7.2 Request to Send Operation ...................................... 3-8
3.7.2.1 Secondary Channel Turnaround Operation ............ 3-8
3.7.2.2 Code Turnaround Operation ........................... 3-8
3.8 PROGRAMMING CONSIDERATIONS ............................. 3-9/10
3.8.1 Remote CTRL Operation
.............. ~ ..................... 3-9/10
3.8.2 Remote Load-Cursor Operation
.............................. 3-9/10
3.9 GATED EXTENSION PORT OPERATION
......................... 3-9/10
3.9.1
............................................................. 3-9/10
3.10 VIDEO ATTRIBUTES ............................................. 3-9/10
IV THEORY OF OPERATION ............................................... 4-1
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4.1 GENERAL ............................................................ 4-1
4.2 FUNCTIONAL DESCRIPTION ....................................... 4-1
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
Display Generation •............................................ 4-1
Display Refresh Operation ...................................... 4-1
Monitor Video and Drive Circuits ............................... 4-6
Receiving and Storing Data ..................................... 4-6
Cursor Generation .............................................. 4-6
Keyboard Logic ................................................. 4-6
Data Transmitter Logic ......................................... 4-6
Interface Logic Control ........................................ .4-7
4.2.8.1 Code Turnaround Control ............................. 4-7
4.2.8.2 Reverse Channel Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-7
iii

TABLE OF CONTENTS (cont'd)
SECTION
PAGE
4.2.9 CRT Display Monitor ........................................... 4-7
4.2.10 Power Supplies
................................................. 4-7
4.3 LOGIC DESCRIPTION
............................................... 4-9
4.3.1 General Clear Circuit ... : ...................................... .4-9
4.3.2 Display Counters
............................................... 4-9
4.3.3 Row Counter and Offset Counter Logic .......................... 4-9
4.3.4 Column Counter Logic ........................................ 4-11
4.3.5 Cursor Presentation Logic .................................... 4-11
4.3.6 Memory Address Logic. .. . . .... . .. . . . . . .... . . . . ...... . . .. . .... 4-13
4.3.7 Refresh Memory
and Character ROM Logic ................... 4-15
4.3.8
Erase Logic ................................................... 4-16
4.3.9 WRITE PULSE Logic
......................................... 4-16
4.3.10 Keyboard Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-16
4.3.11 Beeper Logic
.................................................. 4-18
4.3.12
Data Receiver and Command Decoder Logic ................... 4-18
4.3.13
Data Transmitter Logic.. . . .. . . . . .. . . . . . . . . . . . . .. . . .. . .. . . . . .. 4-19
4.3.14 Video Blanking
and Serializer Logic .......................... 4-21
4.3.15 Monitor Drive Logic .......................................... 4-21
4.3.16 Baud Rate Select Logic ....................................... 4-23
4.3.17 Interface Control Logic
....................................... 4-23
4.3.17.1 Code-Turnaround Control
............................ 4-24
4.3.17.2 Reverse-Channel Control
............................. 4-24
4.3.18 Attribute Logic
............................................... 4-24
4.3.19 Program Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 4-24
4.3.20 Keyboard Lock Logic
......................................... 4-24
4.3.21 Power Supplies
............................................... 4-24
4.3.22 ADM 5 Answerback
.......................................... 4-25
4.3.23 ADM 5 Extension
Port Current Loop (Option) ................. 4-25
V MAINTENANCE ........................................................... 5-1
5.1 INTRODUCTION ..................................................... 5-1
5.2 PREVENTIVE MAINTENANCE ...................................... 5-1
5.3 CORRECTIVE MAINTEANCE ........................................ 5-1
5.3.1 Fault Isolation .................................................. 5-1
5.3.2 Failure Analysis ................................................ 5-1
5.4 ADJUSTMENTS ..................................................... ; 5-4
iv DP319

TABLE OF CONTENTS (conl'd)
SECTION
PAGE
5.5 REMOVING AND REPLACING MONITOR CRT
AND SUBASSEMBUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-4
5.5.1 Removing and Replacing CRT .................................. 5-4
5.5.2 Removing and Replacing Flyback Assembly .................... 5-4
5.5.3 Removing and Replacing Monitor Circuit Board ................. 5-5
5.6 TROUBLESHOOTING THE MAIN CIRCUIT BOARD ................ 5-5
5.7 REMOVING AND REPLACING THE MAIN CIRCUIT BOARD ....... 5-5
5.8 REMOVING AND REPLACING KEY SWITCH CONTACTS .......... 5-5
VI REFERENCE DRAWINGS ................................................ 6-1
6.1 REFERENCE DRAWINGS ............................................ 6-1
APPENDIX
ASCI CODE CHART ................................................................... A-I
CONTROL AND OPERATORS CODES
................................................ A-2
ABSOLUTE CURSOR ADDRESSING OPERATION CODES .......................... A-3
LIST OF TABLES
TABLE PAGE
1-1 ADM 5 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-4
2-1 Baud Rate Switch Functions .............................................. 2-4
2-2 Configuration Control Switch Functions .................................. 2-5
3-1' Keyboard Operations ..................................................... 3-5
3-2 ADM Codes for Model 310 Printer ...................................... 3-9/10
5-1 ADM 5 Fault Isolation .................................................... 5-2
5-2
Beep and Contrast Fault Isolation ........................................ 5-2
5-3
HDX Keyboard Fault Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-3
5-4 FDX (Wraparound Plug) or Current Loop Fault Isolation .................. 5-3
5-5 Main Circuit Board Connector Terminals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-6
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TABLE OF CONTENTS (cont'd)
LIST OF FIGURES
FIGURE
1-1
1-2
1-3
1-4
1-5
2-1
2-2
2-3
2-4
2-5
3-1A
3-1B
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
PAGE
ADM 5 Video Display Terminal ........................................... viii
ADM 5
Data Flow Block Diagram ......................................... 1-3
Standard ADM 5 Character Format (By Ascending ASCII
Codes) with Hex Codes .................................................... 1-9
ADM 5 Graphic Set and Control Codes .................................. 1-10
Word Format Codes with Switch Configurations ....................... 1-11112
ADM 5 Connector
and Configuration Switch Locations. . . . . . . . . . . . . . . . . . .. 2-3
Typical ADM 5 Application .............................................. 2-7
RS-232C MODEM and EXTENSION Interface Logic ...................... 2-8
Current Loop Interface Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-9
ADM 5 Read Panel Controls ............................................. 2-11
ADM 5 Standard Keyboard Operational Characteristics ................... 3-2
ADM 5 Standard Keyboard Operational Characteristics (continued) ....... 3-3
ADM 5 Functional Block Diagram ........................................ 4-2
Character Position Layout (5 x 8 Character) ............................... 4-3
Display Counter Timing for 5 x 8 Character ............................... 4-4
Organization of Display Data in Refresh Memory ......................... 4-5
Keyboard Logic Timing. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-8
Display Counters, Block Diagram ........................................ 4-10
Row Counter and Offset Counter Logic, Block Diagram ................... 4-10
Logic Block Diagrams ................................................... 4-12
Memory Address Logic Block Diagram ................................... 4-14
Keyboard Logic Timing .................................................. 4-17
Data Receiver Logic and Command Decoders ............................. 4-19
Data Transmitter Logic, Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-20
Video Blanking and Serializer Logic, Block Diagram . . . . . . . . . . . . . . . . . . . .. 4-22
Baud Rate Select Logic, Block Diagram .................................. 4-23
Interface Timing for Code Turnaround ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-25
Interface Timing for Reverse-Channel Operation ......................... 4-26
vi DP319

SECTION I
GENERAL DESCRIPTION
1.1 INTRODUCTION
This section describes the primary functions
of the Lear Siegler ADM 5 Video Display
Terminal shown
in figure 1-1. Other
information in this section includes
specifications,operatingfeatures and ranges,
physical dimensions,
and a list of available
options.
1.2 PURPOSE AND USE
There are numerous applications of the ADM
5, all involving
the transfer of asynchronous
data.
In someapplications, data transfer may
be exclusively unidirectional; eitherfrom the
ADM 5 to a host computer, or from the
computer to the ADM 5. However, a more
frequent application is one
in which an
operator communicates with the computer,
and the computer reacts in accordance with
its stored program.
The
ADM 5 Video Display Te~nal has the
following general capabilities:
• Full 128 ASCII character set with 80 x 24
character nonglare display
• Lower case standard with full two-dot
descenders
• CAP LOCK Key
• Edit Keys
• Visual Attributes
• TAB Key
• Numeric Keypad with 15 keys
• Program Mode
• Five separate cursor control keys
DP319 1-1
• 10 communication rates in full-duplex and
half-duplex send/receive modes
• Scrolling
• Absolute cursor positioning
• Variable 9-, 10-, or ll-bit word structures
• Selectable Auto New Line operation
• Selectable standard RS-232C or 20mA
current-loop interface, with RS-232C
extension interface, for auxiliary devices.
(Selectable
keyboard lock or gated
EXTENSION port.) Optionalcurrent-loop
interface
on EXTENSION port.
• Special control character sequences
• Selectable refresh rate
1.3 PHYSICAL DESCRIPTION
The ADM 5 is a self-contained unit
consisting of three majorassemblies: (1) base
and cover assembly, (2) main logic board and
(3) the CRT monitor. The power transformer,
a beeper,
and interconnectcabling are located
on the base portion of the terminal. Supports
and guide pins are also located on the base,
and these are used for installing the main
logic board.
The
co~er portionof the terminalcontains the
CRT monitor and its associates
subassemblies. The cover is hinged to the
base at the rear, and when swung open (see
2.5.3), all components of
the ADM 5 are
exposed.
The
main logic board contains all other
operatingelements
of the ADM 5 that are not
contained in the CRT monitor and the base

assembly. This includes the keyboard. The
keyboard is made up of integrated key rows,
or modules. It is built directly on the main
logic board. The logic board rests on supports
within the base, and is held in placeby guide
pins. Two connectors
at the rear edge of the
logic board provide the RS·232C/current·loop
interface and the RS·232C extension
interface.
The CRT monitor is a transistorized unit
consisting of three subassemblies: (1) the
CRT itself, (2) a printed circuit board that
contains most of the video circuitry, and (3)
the flyback subassembly. The monitor
display· screen measures 12 inches
diagonally, and resembles the CRT of a small
black and white television set.
1.4 OPERATIONAL DESCRIPTION
The ADM 5 is an interactive device which is
used to enter, display, and send information
to a host computer, and to receive and display
information from the computer. Using a
keyboard
similar to that of a teletypewriter,
the operator may enter information which is
immediately transmitted to the computer and
may be simultaneously displayed on a
cathode ray tube (CRT). Data from the
computer is received and displayed at baud
rates as high as 19200 (the maximum baud
rate when using the current loop option is
9600). Figure 1-2 illustrates the functional
areas of the ADM 5 with corresponding data
flow between these functional areas.
1.4.1 Keyboard
The keyboard contains 83 keys from which
data entry and controlfunctions are initiated.
Each keystroke is encoded into a
corresponding ASCII
character which is
immediately transmitted to the host
computer. The character is alsorouted back to
the CRT display; directly via the I/O
interface in half-duplex operation, or echoed
from
the host computer via the I/O interface
in full-duplex operation.
1.4.2 Input/Output (I/O) Port
The MODEM (I/O) port is the link, or
interface,
that handles the flow of data in
both directions between the ADM 5 and the
computer. In half-duplex operation, each
1-2
character entered from the keyboard is
transmitted and simultaneously routed back
to the control logic and display memory for
CRT display.
1.4.3 ADM 5 Control logic
ADM 5 Control Logic interprets the control
codes
that originate either at the keyboard or
host computer, and directs the activities of the
ADM 5 accordingly. These activities include
data handling, and formatting.
1.4.4 Display Memory
The display memory contains random access
memory (RAM), video logic,
and character
generation circuits appropriate for
controlling the CRT display. The memory is
capable of holding 1920 characters, which are
stored in sequentially scanned locations. The
scanned data is then sent to the CRT for
displaying.
Input to the display memory
consists
of the data character codes from the
I/O port or keyboard, under the control of
signals from the control logic circuits.
1.4.5 CRT Display Monitor
The CRT display monitor is a rectangular
screen measuring 12 inches diagonally. Data
characters are displayed on 24 equally-spaced
rows,
each consisting of 80 (maximum)
characters. The 80 character lines are
displayed clearly at a refresh rate of either 50
or 60 Hz, corresponding to the AC line
frequency.
1.5 SPECIFICATIONS
The ADM 5 specifications are listed in Table
1-1. In addition, several operation features,
such
as send/receive modes, character
format, word structure, data entry and
overflow, and configuration control are
discussed in the paragraphs that follow.
Specific operational
information regarding
configuration control, format and work
structure, modes, etc., is
contained in Section
II of this manual.
1.5.1 Send/Receive Modes
Two switch-selectable send/receive modes
are available in the ADM 5: half-duplex and
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