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HP 2624 User Manual

HP 2624
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Data
Communications
Receive Errors
When
receiving
data
from
the
remote
device,
the
terminal
will
detect
the
following
three
types
of
error
conditions (in
addition
to
parity
errors):
1.
Character
overruns-a
character
is received before
the
preceding
character
was processed
by
the
terminal's
data
comm firmware.
2.
Framing
errors-no
stop
bit
was detected
at
the
end
ofa
character
(this
may
go undetected for a
single-character
transmission
or
for
the
final
character
in
a
string
of
received characters).
3. Buffer
overflows-the
entire
allocated buffer space
is
filled (both
the
working
buffer
and
the
overrun
area).
The
final
character
received before
this
condition
was
detected will be
overwritten.
Note
that
if
receive
pacing
is
enabled
and
the
remote device is
using
the
selected
form of pacing,
this
condition should
never
occur.
Receive errors,
when
detected,
are
reported
to
the
remote
device
by
way
of
byte
5
of
the
primary
terminal
status
bytes.
The
remote device will
not
be
able
to
determine
which
type
of
error
occurred.
If
multiple
receive
errors
occur simultaneously, only one will be
reported
as
per
the
following
order
of
precedence:
1.
Framing
error
(highest priority)
2.
Parity
error
3.
Character
overrun
4. Buffer overflow (lowest priority)
Transmit State
In
a
half
duplex
environment,
the
following RS-232C sig-
nals
are
required
for
the
terminal
to
be
in
transmit
state:
Request
to
Send (RS/CA)
high
Data
Terminal
Ready (TRlCD)
high
Secondary Request to
Send
(SCA) low
When
filling
in
either
of
the
half
duplex
data
comm
configuration menus, you
may
specify
whether
the
ter-
minal
is
to be
in
transmit
or
receive
state
after
its
power is
first
turned
on
or
after
the
terminal
is
reset
(Ini
tStl!lt
field).
it
is
important
that
the
terminal
and
the
remote
driver
or
controller
program
be
in
complementary
states
when
the
communications
link
is
being
established.
Ifboth
are
in
transmit
state
or
ifboth
are
in
receive
state,
the
link
cannot
be
established.
Receive State
In
a
half
duplex environment,
the
following RS-232C sig-
nals
are
required
for
the
terminal
to be
in
receive
state:
Request to Send (RS/CA) low
Data
Terminal Ready (TRlCD)
high
Secondary Request to Send (SCA)
high
When
filling
in
either
of
the
half
duplex
data
comm
configuration menus, you
may
specify
whether
the
ter-
minal
is
to be
in
transmit
or
receive
state
after
its
power
is
7-14
first
turned
on
or
after
it
is
reset
(Ini
tSti!!lt
field).
It
is
important
that
the
terminal
and
the
remote
driver
or
con-
troller
program
be
in
complementary
states
when
the
(
communications
link
is
being
established.
If
both
are
in
transmit
state
or
if
both
are
in
receive
state,
the
link
cannot
be established.
Local/Remote Modes
The
data
communications
portion
of
the
terminal
operates
independently
of
whether
the
terminal
is
in
local
or
remote.
If
the
terminal
is
switched from
remote
to local
while
data
is
being
received from
the
remote
device,
the
data
comm
portion
of
the
terminal
continues
receiving
data
(it
does NOT
halt
the
transmission).
In
such
a case,
the
data
received while
the
terminal
is
in
local
is
discarded
by
the
terminal's
data
comm firmware.
The
transmit/receive
state
of
the
terminal
is
not
affected
by
a
transition
from
remote
to local
or
from local to remote.
Full Duplex Operation
In
a full duplex
environment,
the
HP
2624A
is
capable
of
transmitting
and
receiving simultaneously.
The
ability
to
transmit
may
be
inhibited
temporarily,
but
it
is
never
exclusive of
the
ability
to receive.1\vo physical
sets
of
data
lines
are
required; control lines
are
needed only
when
hard-
ware
handshaking
or
a modem
is
used.
'fransitions
on
the
control
lines
have
no
effect
upon
the
actual
trans-
mit/receive
state
of
the
terminal.
When
the
terminal
is
connected to
the
host
computer
by
way
of
a modem,
the
following
primary
control lines
are
required:
Request
to
Send
(RS/CA)
Clear
to
Send
(CS/CB)
Data
Terminal
Ready
(CD/TR)
In
addition,
the
following control
lines
may
be
used:
Receiver Ready
(RRlCF)
Data
Signal
Rate
Select (SRlCH)
Secondary
Request
to
Send
(SRS/SCA)
Secondary Receiver Ready (SRRlSCF)
Half Duplex Operation
In
a
half
duplex
environment,
the
HP
2624A
has
two
mutually
exclusive
states:
transmit
and
receive.
Although
the
transmission
line
may
physically
have
two
sets
of
data
lines,
the
terminal
functions
as
though
there
is
only
one
set
(that
is,
it
assumes
that
transmissions
must
be
prevented
while
the
terminal
is receiving,
and
vice versa). A line-
turnaround
occurs
when
the
terminal
switches from one
state
to
the
other. A
half
duplex
configuration
implies
that
a modem
is
present.
The
transition
from receive
state
to
transmit
state,
and
vice
versa,
is
governed
by
the
particular
half
duplex
line
protocol
being
used.
In
order
to complete
an
attempt
to
switch from receive
state
to
transmit
state,
Clear
to
Send
(CB)
must
be high.
Ifcircuit
assurance
is enabled,
then
the
(
(

Table of Contents

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HP 2624 Specifications

General IconGeneral
BrandHP
Model2624
CategoryTouch terminals
LanguageEnglish

Summary

Introduction to the HP 2624A

The Keyboard

Describes the HP 2624A keyboard layout, divided into five major groups of keys.

Function Keys

Explains the eight function keys and their dynamic behavior, including mode selection.

Display Screen

Details the HP 2624A display screen structure, resolution, and character cell.

Display Memory

Describes the HP 2624A's display memory configuration and storage.

Configuring the Terminal

Explains how to configure the terminal using menus and programmatic sequences.

Integral Printer

Details the optional integral printer's capabilities and usage.

Data Communications

Discusses the terminal's data communication ports and modes.

Self-Test

Covers the various self-test features for verifying terminal operation.

Configuring the Terminal

Introduction to Terminal Configuration

Overview of terminal configuration through menus and escape sequences.

Configuration Function Keys

Explains the function keys used to access configuration menus.

Configuration Menus

Summarizes the available configuration menus for the HP 2624A.

Terminal Configuration Menu

Details the terminal configuration menu and its fields.

Programmatic Configuration

Describes how to change terminal parameters using escape sequences.

Lock and Unlock Configuration Menus

Explains how to lock and unlock configuration menus for security.

Keyboard Control

Introduction to Keyboard Control

Overview of the HP 2624A keyboard and its functional groups.

Selecting Modes

Explains how to select terminal operating modes using function keys.

Character and Block Modes

Describes data transmission modes: character mode and block mode.

Format Mode

Details the format mode for creating and using data entry forms.

Line Modify Mode

Explains the line modify mode for editing command strings.

Modify All Mode

Describes the modify all mode for editing data on the screen.

Auto Line Feed Mode

Explains the auto line feed mode for appending line feeds to carriage returns.

Memory Lock Mode

Details the memory lock mode for overflow protection and display lock.

Display Functions Mode

Describes how display functions mode affects ASCII control code handling.

Caps Mode

Explains the caps mode for controlling alphabetic key output.

Caps Lock Mode

Details the caps lock mode for generating uppercase ASCII codes.

User-Definable Keys

Explains how to define custom functions for the eight function keys.

Defining Keys Programmatically

Describes how to define user keys remotely using escape sequences.

Controlling Function Key Labels Programmatically

Explains programmatic control of function key labels on the display.

The Enter Key

Details the operation of the Enter key for data transfer and block operations.

Send Display Command

Explains the ESC>d command for triggering block transfers from display memory.

Enable/Disable Keyboard

Describes how to enable and disable the terminal's keyboard via escape sequences.

Soft Reset

Explains the soft reset procedure and its effects on terminal operation.

Hard Reset

Details the hard reset procedure and its effects on terminal configuration.

Break Function

Describes the break function for interrupting computer operations.

Bell Function

Explains the terminal's bell speaker and its response to control codes.

Wait Function

Describes the wait function for pausing terminal operations.

Modem Disconnect

Explains how to disconnect the modem using an escape sequence.

Display Control

Introduction to Display Control

Overview of the HP 2624A display screen and memory operations.

Cursor Control

Explains how to alter the cursor position using keys or escape sequences.

Move Cursor Up

Details how to move the cursor one row up in the current column.

Move Cursor Down

Details how to move the cursor one row down in the current column.

Move Cursor Right

Details how to move the cursor one column right in the current row.

Move Cursor Left

Details how to move the cursor one column left in the current row.

Roll Text Up

Explains how to scroll display memory up one row.

Roll Text Down

Explains how to scroll display memory down one row.

Next and Previous Page

Describes how to access subsequent or preceding pages of display data.

Screen Relative Addressing

Explains cursor positioning relative to the current screen position.

Absolute Addressing

Details cursor positioning using absolute row and column coordinates.

Cursor Relative Addressing

Explains cursor positioning relative to the current cursor position.

Edit Operations

Covers various screen edit functions like insert/delete line and character.

Clear Display

Explains how to clear display memory from the cursor position.

Clear Line

Details how to clear the current line from the cursor position.

Setting and Clearing Margins

Describes how to define and reset left and right margins.

Setting and Clearing Tabs

Explains how to define and clear tab stops for cursor positioning.

Display Enhancements

Details standard display enhancements like inverse video and blinking.

Designing and Using Forms

Introduction to Forms Design

Overview of creating data entry forms with line types and annotations.

Drawing Forms

Explains the process of creating the linear structure of a form.

Defining Fields

Covers defining protected, unprotected, and transmit-only fields.

Transmit-Only Fields

Details the characteristics and behavior of transmit-only fields.

Field Attributes

Explains implicit and explicit attributes for data entry fields.

Defining Fields From the Keyboard

Describes how to specify field types and attributes using a menu.

Defining Fields Programmatically

Explains how to define fields remotely using escape sequences.

Transmit Modified Fields

Details how the Modified Data Tag affects data transmission.

Transferring Form Structures

Explains how to transfer form structures from screen to host computer.

Device Control

Introduction to Device Control

Overview of controlling printers and data transfers.

Display to Printer Data Transfers

Explains how to print data from display memory to printers.

Copy Line

Describes how to copy the current line to a printer.

Copy Page

Details how to copy a page of data to a printer.

Copy All

Explains how to copy all lines from cursor to end of display memory.

Copy All of Display Memory

Describes how to copy the entire display memory content to a printer.

Skip Line

Explains how to advance the paper by one line.

Computer to Terminal Data Transfers

Details how to transfer data from a host computer to printers.

Selecting Printer Modes

Explains how to select printer modes like expanded or compressed characters.

Report Format

Describes the report format for printing 66-line pages.

Metric Format

Details the metric format for printing 70-line pages.

Data Logging

Explains data logging features for capturing data to printers.

Printer Self-Test

Covers the printer self-test procedure to verify functionality.

Data Communications

Introduction to Data Communications

Overview of connecting terminals to computers for data exchange.

Selecting Equipment and Cables

Guides on selecting appropriate equipment and cabling for data links.

Hardwired Connections

Details on establishing point-to-point hardwired connections.

Modem Connections

Explains factors for choosing modems for point-to-point connections.

Installing Point-to-Point Configuration

Provides instructions for installing a point-to-point data link.

Port #2 Cabling

Details cabling requirements for the terminal's second data port.

Configuring the Terminal for Data Comms

Explains how to configure data communications settings on the terminal.

Point-to-Point Programming Information

Provides programming reference for asynchronous point-to-point communication.

Start and Stop Bits

Explains the role of start and stop bits in asynchronous data transmission.

Data Bits (Character Length)

Details the number of data bits per character and 7-bit vs 8-bit operation.

Parity Checking

Covers vertical redundancy check (VRC) for character-based error checking.

Receive Buffer

Describes the terminal's receive buffer and its role in data reception.

Receive Errors

Explains types of receive errors detected by the terminal.

Local/Remote Modes

Describes the terminal's local and remote modes for data communications.

Full Duplex Operation

Details simultaneous transmission and reception in full duplex environments.

Half Duplex Operation

Explains the mutually exclusive transmit and receive states in half duplex.

Pacing Mechanisms

Covers transmit and receive pacing mechanisms like handshake and XON/XOFF.

Status

Introduction to Status Information

Overview of obtaining and interpreting status information from the HP 2624A.

Interpreting Status

Explains how to interpret status bytes using ASCII character codes.

Terminal ID Status

Describes how to request and verify the terminal's model identification.

Primary Terminal Status

Details the first set of status bytes reporting configuration and error flags.

Secondary Terminal Status

Covers the second set of status bytes reporting configuration and memory lock.

Device Status

Explains how to obtain status information for printers.

Error Messages and Self-Tests

Introduction to Errors and Self-Tests

Overview of terminal error messages and self-test procedures.

Error Messages

Lists and explains various error messages that may appear on the terminal.

Terminal Self-Tests

Details the six types of self-tests available for the HP 2624A.

User Data Comm Test

Describes the user data communication test procedure.

Printer Test

Explains the printer test procedure to verify integral printer functionality.

Manufacturing Test

Covers the manufacturing test used during terminal burn-in.

Identify ROMs

Explains how to generate a list of all installed ROM chips.

Terminal Maintenance Procedures

Cleaning the Screen and Keyboard

Provides instructions for cleaning the terminal's screen and keyboard.

Battery Maintenance

Details the battery replacement schedule and procedure for non-volatile memory.

Thermal Printer Paper

Specifies the type of thermal paper required and how to purchase it.

Paper Loading

Provides step-by-step instructions for loading thermal printer paper.

Appendix A: Summary of Command Sequences

Data Operations

Lists escape sequences for controlling data transfers and operations.

Appendix B: Keyboards and Character Set

National Keyboards

Shows layouts for various national keyboards available as options.

7-Bit vs. 8-Bit Operation

Explains the terminal's configuration for 7-bit and 8-bit data operations.

ISO/ASCII Character Set

Details the standard ISO/ASCII character set and national language variations.

Large Character Set

Describes how to construct large characters using alphanumeric and symbol keys.

Math Set

Explains how to generate mathematical symbols using keyboard keys.

Line Drawing Set

Details how to use the line drawing set for creating forms.

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