HP 2624 User Manual

queued by the terminal and sent as a block after the •
key is pressed. If handshaking is disabled, the data block is
sent when the. key is pressed. When the DC1 trigger
handshake is enabled, the data block is sent when the next
subsequent <DC1> is received from the host computer.
When the DC 1 I DC2 I DC 1 handshake is enabled, pressing the
• key causes the terminal to send a <DC2> to the host
computer and then send the data block when the computer
responds with a <DC1 >. The operation of the. key is
described in detail in table 3-1 in Section III of this manual.
There are certain functions which always result in a
multicharacter (block) data transfer:
• terminal-to-computer data transfers initiated by an
<ESC>d or some ofthe <ESC>&p sequences.
• user key-to-computer data transfer (T or 1'1 attribute).
• responses to status requests from the host computer.
• responses to cursor sensing requests from the host com-
puter.
The driver program at the host computer must support
whatever handshaking process is being used by the ter-
minal (no handshake, DC 1 trigger handshake, or
DC1 IDC2/DC1 handshake). In the latter case theDC2 must be
recognized
as a request to send data and the DC1 must be
sent to trigger the transfer after buffers have been
allocated to receive the data block. Additional software
support may be needed depending upon your need for ter-
minal or device control. The I nhHndShkCG) and I nh
DC2(H) fields
of the Term #1-4 configuration menus
specify which form of handshaking the.terminal will use.
The Terminal Configuration menu is described in Section
II,
Configuring the Terminal.
Note:
The computer should not be allowed to echo back
information that has been transmitted as a block
from
the terminal.
Start and Stop Bits
These hardware-generated bits are used for synchronizing
the transmit and receive devices in an asynchronous
environment. A start bit is a "zero" line state ( + 12V) that
lasts for 1.0 bit time; it is affixed to the beginning of a serial
character bit stream (which may also include a parity bit).
A stop
bit is a mark or a "one" line state (-12V) that lasts for
1.0, 1.5, or 2.0 bit times; it is appended to the end of each
serial character bit stream. After the stop bit, the line
remains in the mark state until the next character, sig-
nified by a start bit, is transmitted.
Data Bits (Character Length)
The character length is the number of bits (excluding
parity) used to represent each data character. The HP
Data Communications
2624A allows
you to specify either 7 -bit or 8-bit data codes,
thus accomodating 7 -bit ASCII and 8-bit ASCII (where the
eighth bit is used to specify whether or not the character
code is from the alternate character set).
Parity Checking
In an asynchronous point-to-point environment the HP
2624A provides a vertical redundancy check (VRC) that is
a
character-based error checking mechanism for non-
binary data. With VRC an additional bit is affixed to each
character to provide an expected high-order bit state for
each character. This type of parity generation and check-
ing is a means of determining the validity of data transfer
on a character-by-character basis.
Note that when 8-bit data is being exchanged, parity can-
not be used and the "Pari ty" field in the data comm
configuration menu must be set to "NONE".
The HP 2624A offers the following four types of parity:
1. Os. The high-order bit is always a zero.
2. Is. The high-order bit is always a one.
3.
Odd. The high-order bit is set to a zero or a one,
whichever produces
an odd number of one bits in the
overall character representation (the seven data bits
plus the eighth parity bit). •
4. Even. The high-order bit is set to a zero or a one,
whichever produces an even number of one bits in the
overall character representation (the seven data bits
plus the eighth parity bit).
Receive Buffer
The terminal's receive buffer is a first in/first out (FIFO)
storage area for accepting data from the remote device.
When you are using any type of receive pacing, this buffer
is
partitioned into a working buffer and a 40-byte overrun
area. For example, if the specified buffer size is 128 bytes
and receive pacing is being used, the working buffer is 88
bytes long and the overrun area is 40 bytes long. When the
data being received exceeds the working buffer and in-
trudes upon the overrun area, the terminal will exercise its
receive pacing mechanism (send an XDFF, for example, if
XonXoff receive pacing is enabled) at that time to
temporarily halt the flow of data from the remote device.
When
enough data has been processed so that the receive
buffer
is only half full, the terminal then signals the remote
device to resume transmission (by sending an XON, for
example, ifXonXoff receive pacing is enabled).
There is no equivalent overrun area for transmitting data
from the terminal to the remote device.
7-13

HP 2624 Specifications

General

Brand	HP
Model	2624
Category	Touch terminals
Language	English

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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