5
Using Set-Up

Overview

The VT420 has nine set-up screens that list the settings for the terminal's operating features.

You can display these screens and change the settings from the keyboard. This chapter describes set-up and how to use it.

Most set-up features are initially set to a factory-default setting that works with many Digital systems. The VT420 has the factory-default settings permanently stored. If you change settings, you can use the Set-Up Directory to reset the terminal to the factory-default settings.

You can also select and save settings to match your host system. The VT420 saves your selections in nonvolatile memory, along with the factory-default settings. When you shut power off, you do not lose your saved settings.

You can make all changes to set-up features from your keyboard. Also, your host system can change some settings, as described in the VT420 Programmer Reference Manual. See Appendix B to order VT420 manuals.

Independent Setups for Two Sessions

The VT420 can run two sessions with the host system at the same time. Chapters 2 and 3 explain how to set up the terminal to run two sessions.

When you use two sessions, the terminal stores a separate group of features for each session. Only one session is active at a time. The terminal uses the settings for the active session.

If you forget which session is active, you can check the keyboard indicator line at the bottom of the screen. See the "Keyboard Indicator Line" section in Chapter 4.

NOTE: You cannot switch sessions in set-up. To switch sessions, you must leave set-up and press the F4 (Session) key.

Entering and Leaving Set-Up

To enter set-up: You press the F3 (Set-Up) key. When you press F3 (Set-Up), information on the screen disappears. (This information reappears when you leave set-up.) Then the terminal displays the Set-Up Directory screen.

The Set-Up Directory lists all other set-up screens. You can select any other set-up screen from the Set-Up Directory.

To leave set-up: You press F3 (Set-Up) again. You can leave set-up from any set-up screen.

NOTE: Most settings that you change take effect when you leave set-up.

Set-Up Directory

When you enter set-up, the Set-Up Directory is always the first screen to appear. You can select any set-up screen from the Set-Up Directory. You can also perform such functions as saving and recalling feature settings.

Status Line and Keyboard Indicator Line

In set-up, the VT420 always displays the status line and the keyboard indicator line for the active session. Both lines appear at the bottom of the screen. The keyboard indicator line is in the smaller, 132-column font and appears below the status line. The keyboard indicator line is in the same video background as the session at the bottom of the screen. For more information, see the "Keyboard Indicator Line" and "Status Line" sections in Chapter 4.

Set-Up Cursor

Set-Up uses a field cursor that highlights a screen entry, or field, in reverse video. When you enter set-up, the field cursor highlights the Global field in the Set-Up Directory.

You use the arrow keys to move the field cursor to different features.

Action Fields

Most features in the Set-Up Directory are action fields. When you select an action field, the terminal immediately performs that action. You press the Enter key to select the action field highlighted by the cursor. Most set-up screens have some action fields.

Some actions do not affect the screen, so the VT420 displays a message to let you know if the action was successful. This message appears in place of the keyboard indicator line at the bottom of the screen.

The VT420 displays messages for the following action fields on the Set-Up Directory screen.

Set-Up Language

The set-up language feature lets you display the set-up screens in one of three languages: English, French, or German. The language you select takes effect immediately in set-up. To change the setting:

  1. Press F3 (Set-Up). The terminal displays the Set-Up Directory.
  2. Use the arrow keys to move the cursor to Set-Up=English.
  3. Press Enter to change the set-up language setting. Each time you press Enter, the language changes immediately.

Set-Up Directory Fields

Table 5-1 describes the Set-Up Directory features.

Table 5-1 Set-Up Directory Features
Feature Description
Global
Display
General
Comm
Printer
Keyboard
Tab
These fields select the set-up screen. For example, Global selects the Global Set-Up screen.
Clear Display Clears the screen when you leave set-up.
Clear Comm Clears communications for the active session. Clear Comm does not affect the on-line/local state, but does the following:
  • Stops any print operation.
  • Stops any escape sequence, control sequence, control string, or character string processing (ESC, CSI, DCS, APC, OSC, PM, SOS).
  • Clears the keyboard buffers.
  • Clears the receive buffer.
  • Clears the transmit buffer.
  • Stops printer controller mode and returns to normal print mode.
  • Sends an XON signal to the host.
  • Sends an XON signal to the printer if the printer to host and XOFF features are enabled in the Printer Set-Up screen (Chapter 8).
  • Resets the XOFF received flags at the printer and host ports.
  • Does not clear the screen.
  • Clears a keyboard wait condition.
  • Clears the "printer port has seen DSR since power up" flag.
Reset Session

Resets many VT420 operating features for the active session to their initial state.

The screen, communication, character set modes, and user-defined keys are not affected. See the VT420 Programmer Reference Manual.

Recall Sets all set-up features for the active session to their saved values. Clears the screen.

NOTE: If you are using a modem, Recall disconnects communication with the host system.

Save Saves all current feature settings in all set-up screens for the active session.
Set-up language
  • Set-Up=English
  • Set-Up=Francais
  • Set-Up=Deutsch
Selects the language used to display set-up screens.
Keyboard dialect
  • North American Keyboard
Lets you select one of many languages and dialects to match your keyboard. The default is North American Keyboard. The other keyboards are the British, Flemish, Canadian (English), Canadian (French), Danish, Dutch, Finnish, German, Italian, Swiss (French), Swiss (German), Swedish, Norwegian, French/Belgian, Spanish, and Portuguese.
Default

Replaces all current settings in all set-up screens with the factory-default settings. This feature may affect both sessions, because the default session configuration is one session.

The default feature also:

  • Clears the screen and returns the cursor to the upper-left corner.
  • Stops any print operation.
  • Stops any escape sequence, control sequence, control string, or character string processing (ESC, CSI, DCS, APC, OSC, PM, SOS).

NOTE: If you are using a modem, Default disconnects communication with the host system.

Enable Sessions

Lets you resume an interrupted session. A session can be interrupted by a power failure to the terminal or host.

To use this feature, your system must have SSU software. Also, you must set the terminal comm ports feature in the Global Set-Up screen to Sessions on Comm1.

When you select this feature, one of the following messages on the status line:

  • Done
  • Sessions restored
  • Sessions not selected

See Chapter 7 for more information.

Disable Sessions Disables the current SSU sessions.
Exit Lets you leave set-up. You can also press F3 (Set-Up) to leave set-up.
Screen Align

Lets you center or rotate the image on the screen. This feature clears the screen and creates a black border around the screen's perimeter. The text area of the screen appears in reverse video from the border.

After you select this feature, follow the directions on the screen to align the image correctly.

Selecting Set-Up Screens

There are two ways to select set-up screens. You can move from one screen to the next, in the same order listed on the Set-Up Directory. You can also select any screen directly from the Set-Up Directory.

Moving from Screen to Screen

Each set-up screen has a To Next Set-Up field. To move from one screen to the next:

  1. Use the arrow keys to move the cursor to To Next Set-Up.
  2. Press Enter.

Selecting a Screen from the Set-Up Directory

The Set-Up Directory lists all the set-up screens. To display a selected screen:

  1. Use the arrow keys to move the cursor to the name of the desired screen.
  2. Press Enter.

Changing and Recalling Settings

This section describes how to change, save, and recall set-up settings.

How to Change Settings

Use the arrow keys to move the set-up cursor to a particular feature on a set-up screen. Most features have two or more possible settings. Use the Enter key to change the setting of the feature highlighted by the cursor. Each time you press Enter, the setting changes. Depending on the feature, the change takes effect immediately or when you leave set-up.

Example

This example shows you how to change the screen display setting from 80 to 132 columns.

  1. Press F3 (Set-Up) to enter set-up. The Set-Up Directory appears. The field cursor is on the Global field.
  2. Use the arrow keys to move to the Display field.
  3. Press Enter. The Display Set-Up screen appears.
  4. Use the arrow keys to move to the 80 Columns field. Press Enter to change the setting to 132 Columns.

When you change a feature setting, the VT420 uses that setting until you turn the terminal off or change the setting again. To save a new setting, read the next section.

How to Save Your Settings

If you make changes to current settings, you can save your changes with the save feature in the Set-Up Directory. This feature saves all current settings (in most set-up screens) for the active session. Even after you turn off the terminal, it retains the saved settings. The VT420 automatically uses these settings each time you turn the terminal on.

Example

This example shows how to save the 132 column setting selected in the previous example.

  1. After you select the 132 columns setting, use the arrow keys to move to the To Directory field.
  2. Press Enter to return to the Set-Up Directory screen.
  3. Use the arrow keys to move to the Save field.
  4. Press Enter to save all current settings.
  5. Press F3 (Set-Up) to leave set-up.

If you change settings again, you can recall your saved settings. Read the next section.

How to Recall Saved Settings

For some applications, you may want to make temporary changes to current settings. When you are finished using the temporary settings, you can recall your saved settings with the recall feature in the Set-Up Directory.

To recall saved settings:

  1. Press F3 (Set-Up). The terminal displays the Set-Up Directory.
  2. Use the arrow keys to move the cursor to the Recall field.
  3. Press Enter. The VT420 replaces all existing settings with the previously saved settings. A Done message on the status line indicates the action is complete.
  4. Press F3 (Set-Up) to leave set-up.

NOTE: If you are using a modem, Recall disconnects communication with the host system.

Global Set-Up Screen

This screen has features that affect both sessions when you use two sessions. Table 5-2 describes each feature on the Global Set-Up screen.

Two Sessions

You use two features on the Global Set-Up screen to set up the VT420 for two sessions.

The feature settings must match the system cable connection on the rear of the terminal. After you connect the terminal's cables and select the set-up features for two sessions (Chapter 3), refer to Chapter 7 to use two sessions.

Table 5-2 Global Set-Up Features
Feature and Settings Description
Default settings are in bold type.
On-line/local Selects whether or not the VT420 can communicate with a host system.
  • On Line
Lets the VT420 communicate with a host.
  • Local
Puts the host on hold. The characters you type go directly to the screen.
Terminal comm ports Assigns the communication connectors on the rear of the terminal to session 1 or 2.
  • S1=Comm1
Assigns only one session to the Comm1 connector. The Session indicator does not appear on the keyboard indicator line.
  • S1=Comm1,S2=Comm2
Assigns session 1 to the Comm1 connector, and session 2 to the Comm2 connector.
  • S1=Comm2,S2=Comm1
Assigns session 1 to the Comm2 connector, and session 2 to the Comm1 connector.
  • Sessions on Comm1
Assigns both SSU sessions to the Comm1 connector. Both sessions use the same communication cable.
CRT saver Increases screen life.
  • CRT Saver
If the terminal is left on but inactive for 30 minutes, the screen goes blank. You can press any key to reactivate the screen. The host can also reactivate the screen by sending any character.
  • No CRT Saver
CRT saver feature is disabled.
Comm port selection Selects the 25-pin, RS-232 or 6-pin, DEC-423 connector as the Comm1 port.
  • Comm1=RS-232
Selects the 25-pin RS-232 connector as the Comm1 port. The connector conforms to EIA RS-232 standards. You can use this setting for a connection to a host, terminal server, or modem.
  • Comm1=DEC-423
Selects the 6-pin DEC-423 port as the Comm1 port. The connector conforms to EIA RS-423 standards. You can use this setting for a connection to a host or terminal server.
Screen refresh rate Sets the video refresh rate.
  • 70 Hz
This screen refresh rate is recommended in most environments, to minimize flicker.
  • 60 Hz
Used in environments with electrical noise interference.
Printer assignment Selects which session can use the printer port.
  • Printer Shared
Both sessions can use the printer port, but not at the same time.
  • Printer Session 1
Only session 1 can use the printer port.
  • Printer Session 2
Only session 2 can use the printer port.

Display Set-Up Screen

This screen has features that affect the way data appears on the screen. Table 5-3 describes the Display Set-Up features.

Selecting a Page Size

The VT420 has page memory that can store up to 144 lines of text entered from the keyboard or host system. You can divide the 144 lines into a different number of pages, by using the page arrangement feature on the Display Set-Up screen.

There are many page sizes available (Table 5-3). The default page size is the same size as the default screen display area.

Pages create boundaries. Before you change the standard page size of 24 lines, you may want to check your application's documentation to make sure the application can recognize the new page boundaries. To display a new page, use the Ctrl Next and Ctrl Prev keys.

Selecting the Number of Lines/Screen

You use the lines/screen feature on the Display Set-Up screen to select the number of text lines you see on the screen. The ability for the VT420 to display the selected number of lines depends on the following factors:

If... Then...
The page size is less than the number of Lines/Screen displayed The VT420 displays only the number of lines on the page.
The page size is greater than the number of Lines/Screen display The VT420 may display additional lines on the screen. For example, when the status display feature is disabled, an additional line of data is put in place of the missing status line.
You use two windows The number of lines displayed is limited by the screen area allocated to each session.

Coupling the Cursor to the Display

The VT420 lets you pan through the information stored on one page or move to another page. The Display Set-Up screen has two features that determine whether or not the display automatically pans to keep the cursor visible: vertical coupling and page coupling. See Chapter 7 for a description of panning.

Table 5-3 Display Set-Up Features
Feature and Settings Description
*The number of lines/screen is a user preference feature. If you select the user features locked feature in the General Set-Up screen and enable auto resize screen in the Display Set-Up screen, then the number of lines/screen changes when the page size change. For more information, see "Selecting the Number of Lines/Screen" at the beginning of this section.
Default settings are in bold type.
80/132 column mode Selects an 80- or 132-column page width for text.
  • 80 Columns
  • 132 Columns

The screen display width is the same as the page width.

If you change the current setting, page memory clears.

Control representation mode
  • Interpret Controls
  • Display Controls
Selects whether the terminal processes (interprets) or displays control characters. You can use this feature as an aid for debugging programs. See "Display Controls Mode" in the VT420 Programmer Reference Manual.
Auto wrap Selects whether or not text automatically wraps to the next line when you reach the right margin.
  • No Auto Wrap
When you reach the margin, the VT420 displays each new character in the last column of the line. Each new character overwrites the previous character at that position.
  • Auto Wrap
When you reach the margin, the VT420 displays new characters on the next line.
Smooth/jump scroll
  • Smooth-2 Scroll
  • Smooth-4 Scroll
  • Jump Scroll
When you select Smooth-2 Scroll or Smooth-4 Scroll, text on the screen scrolls smoothly. Smooth-4 Scroll is twice as fast as Smooth-2 Scroll. When you select Jump Scroll, text on the screen scrolls as fast as the terminal processes it.
Light/dark screen
  • Dark Screen
  • Light Screen
Selects light text on dark background, or dark text on light background. Takes effect in set-up.
Cursor
  • Cursor
  • No Cursor
Selects whether or not to display the cursor.
Cursor style
  • Block Cursor Style
  • Underline Cursor Style
Selects a block or underline cursor.
Status display Selects how and when to use the status line.
  • No Status Display
This session does not display a status line outside of set-up.
  • Indicator Status Display
The VT420 displays a status line for the current session.
  • Host Writable Status Display
The host can display information on the status line for this session.

NOTE: In set-up, the terminal always displays the status line for the current session.

Cursor blink
  • Cursor Blink
  • Cursor Steady
Selects whether or not the cursor blinks (flashes).
Page arrangement Selects the number of lines/page. The effect of this feature depends on whether you are running one session or two sessions.
  • For Two Sessions
  • 3x24
Selects 3 pages, with 24 lines/page.
  • 2x25
Selects 2 pages, with 25 lines/page.
  • 2x36
Selects 2 pages, with 36 lines/page.
  • 1x48
Selects 1 page of 48 lines.
  • 1x72
Selects 1 page of 72 lines.
  • For One Session
  • 6x24
Selects 6 pages, with 24 lines/page.
  • 5x25
Selects 5 pages, with 25 lines/page.
  • 4x36
Selects 4 pages, with 36 lines/page.
  • 3x48
Selects 3 pages, with 48 lines/page.
  • 2x72
Selects 2 pages, with 72 lines/page.
  • 1x144
Selects 1 page of 144 lines.
Number of lines/screen* Selects the number of lines displayed on the screen at one time.
  • 24 Lines/Screen
Selects the 24 lines/screen font.
  • 36 Lines/Screen
Selects the 36 lines/screen font.
  • 48 Lines/Screen
Selects the 48 lines/screen font.
Vertical coupling
  • Vertical Coupling
  • No Vertical Coupling
Selects whether or not to automatically pan when the cursor moves beyond the top or bottom border of a window. Automatic panning keeps the cursor visible.
Page coupling
  • Page Coupling
Selects whether or not to automatically display a new page when the cursor moves to a new page in page memory. For more information, se "Windows" in Chapter 7.
  • No Page Coupling
If the cursor moves to a new page, you cannot see the page or the cursor.

NOTE: The page coupling feature is only useful when the page arrangement feature is set to two or more pages.

Auto resize screen*
  • No Auto Resize Screen
Selects whether or not to automatically change the number of lines/screen when the page arrangement changes.
  • Auto Resize Screen
Resizes the screen when the page size changes.
Page size Screen size
24 lines 24 lines
25 24
36 36
48 48
72 48
144 48

General Set-Up Screen

This screen lets you set general features, such as the character set used to display characters on the screen. The terminal mode feature lets the VT420 emulate other VT series terminal for software compatibility. Table 5-4 describes the General Set-Up features.

Character Sets

The General Set-Up screen lets you select the type of character set suited for your computing environment, multinational or national. Both types include the characters for many different languages. However, the multinational mode supports 8-bit characters, while the national mode restricts you to 7-bit characters.

You use the character set mode feature to select multinational or national mode. Chapter 9 shows all the built-in character sets.

Multinational Mode

This mode supports two 8-bit character sets:

Both character sets have two parts -- the U.S. ASCII character set and a supplemental set.

If you select multinational mode, you use the UPSS (user-preferred supplemental set) feature to select the supplemental character set you prefer, DEC Supplemental or ISO Latin-1 supplemental. You can enter many of the characters in a supplemental set by using compose sequences (Chapter 6).

By default, the VT420 uses the DEC Multinational character set.

National Mode

This mode supports 12 national replacement character sets (NRCs) built into the VT420. Each 7-bit NRC set is for a particular European language or dialect. You select an NRC set the keyboard dialect feature in the Keyboard Set-Up screen. You can only use one NRC set at a time.

National mode is for 7-bit computing environments. You cannot use the 8-bit multinational character sets in national mode.

NOTE: You cannot select national mode when the keyboard dialect feature is set to North American.

Table 5-4 General Set-Up Features
Feature and Settings Description
*Chapter 9 shows the VT420 character sets.
†The setting is not saved in nonvolatile memory.
Default settings are in bold type.
Terminal mode Selects the terminal's operating mode. The VT420 can emulate any VT series text terminal.
  • VT400 Mode, 7-Bit Controls
Lets the terminal use all VT420 features. The terminal normally uses 8-bit graphic characters and 7-bit control characters. Select this mode for VT200 and VT300 applications. Digital recommends this mode for most applications.
  • VT400 Mode, 8-Bit Controls

Lets the terminal use all VT420 features. The terminal uses 8-bit control characters. See Chapter 9 for details. Select this mode for all VT200 and VT300 applications that use 8-bit control characters.

This mode is the most efficient, but not yet supported by all applications.

  • VT100 Mode
Use this mode for applications that require VT100 compatibility.
  • VT52 Mode
Lets the terminal run VT52 applications.
User defined keys lock
  • User Defined Keys Unlocked
  • User Defined Keys Locked
Selects whether or not the host system can change user-defined key (UDK) definitions.
User features locked
  • User Features Unlocked
  • User Features Locked
Selects whether or not the host system can change the settings of the user preference features: auto repeat, smooth/jump scroll, light/dark screen, tab, keyboard lock, and number of lines/screen. User preference features are intended to be controlled by the user or terminal management software, rather than by application software.
Character set mode Selects whether to use an 8-bit multinational character set or a 7-bit national replacement character (NRC) set.
  • 8-bit Characters
Lets you use one of the 8-bit multinational sets -- DEC Multinational or ISO Latin-1. Both include the 7-bit U.S. ASCII set. You can select the specific set with the UPSS feature listed in this table.*
  • 7-bit NRCS Characters
Lets you use one of the 7-bit NRC sets. You select the specific NRC set with the keyboard dialect feature in the Keyboard Set-Up screen.*

NOTE: If you set the keyboard dialect feature to North American Keyboard, the VT420 automatically sets the character set mode to 8-bit Characters.

Keypad mode Selects the type of characters sent by the numeric keypad.
  • Numeric Keypad
The keypad sends the numbers shown on the keycaps (using ASCII code).†
  • Application Keypad
The keypad sends control sequences (used with some applications).†
Cursor key mode
  • Normal Cursor Keys
  • Application Cursor Keys
Selects whether the arrow keys send ANSI cursor control sequences or application-specific control functions.*
New line Selects how the Return key works.
  • No New Line
Pressing Return sends a carriage return character. The VT420 does not automatically move the cursor to a new line.
  • New Line
Pressing Return sends a carriage return and a line feed. Used for some non-Digital applications.
User-preferred supplemental set (UPSS) When the character set mode feature is set to 8-bit Characters, this feature selects the 8-bit supplemental character set.
  • UPSS DEC Supplemental
Selects the DEC Supplemental character set, which is part of the 8-bit DEC Multinational set. See Chapter 9.
  • UPSS ISO Latin-1 Supplemental
Selects the ISO Latin-1 supplemental character set, which is part of the ISO Latin-1 multinational character set.
Terminal ID
  • VT420 ID
  • VT100 ID
  • VT101 ID
  • VT102 ID
  • VT220 ID
  • VT320 ID
Selects the device attributes response (terminal ID). Some applications require specific responses. This response lets the host system know specific operating attributes of the terminal.

NOTE: If your operating system does not recognize the VT420 ID setting, select the VT320 ID setting (Chapter 3).

Update method Selects how and when to update page memory for the inactive session.
  • When Available Update
Updates page memory for the other session whenever the terminal is not busy with the active session for one second.
  • Shared Update
Updates page memory for a session whenever the terminal is not busy with the other session. Neither session has priority.
  • Never Update
Prevents updates to page memory for the inactive session.

Communications Set-Up Screen

This screen lets you set up the terminal to communicate with your host system. The default settings are those commonly used on Digital systems. Make sure the settings you use match the communication settings of your system.

This screen also includes features for use with modems. Chapter 8 has more information on modems.

If you use the printer connector to connect a second host system to the terminal, the Communications Set-Up screen indicates which port is in use for the current session. The term Comm or Print appears on the top line of the set-up screen.

Table 5-5 describes the Communications Set-Up features. For more information, see VT420 Programmer Reference Manual.

Table 5-5 Communications Set-Up Features
Feature and Settings Description
*See the VT420 Programmer Reference Manual.
Default settings are in bold type.
Transmit speed
  • Transmit=9600
Selects the baud rate the VT420 uses to send data to the host system. The transmit baud rates range from 300 to 38400 bits/second. The default setting of Transmit=9600 works with most Digital systems.

NOTE: The terminal's transmit speed must match the host's receive speed. However, the VT420 can transmit at one speed and receive at another.

Receive speed
  • Receive=Transmit
Selects the baud rate the VT420 uses to receive data from the host system. Receive baud rates range from 300 to 38,400 bits/second. The default setting is Receive=Transmit.

NOTE: The terminal's receive speed must match the host's transmit speed. However, the VT420 can receive at one speed and transmit at another.

XOFF
  • XOFF at 64
Selects the number of characters the VT420 stores in its input buffer before sending the XOFF flow control signal. If you use one session, you can select an XOFF point of 64 or 128. If you use two SSU sessions, you can select an XOFF point of 64, 256, or 1792 (Appendix C).
  • No XOFF
Will not send an XOFF signal.
Data bits/parity
  • 8 Bits, No Parity
Specifies the character format for communicating with the host system, including:
  • Bits used to send each characteer (7 or 8)
  • Parity setting: even, odd, or none
  • Whether or not to check parity on received characters at the host port

If you select a 7-bit environment for the host port, you cannot use 8-bit character sets.

Stop bits
  • 1 Stop Bit
  • 2 Stop Bits
Selects the number of stop bits used by the host port.
Local echo Selects whether or not to send the characters you type directly to page memory.
  • No Local Echo
Sends keyboard data to the host system. The host decides whether or not to send the data back to the terminal.
  • Local Echo
Sends keyboard data both to the host and back to the terminal.
Modem control Configures the terminal to work with various modem features. See Chapter 8.

NOTE: You must select the 25-pin, RS-232 connector on the VT420 to use all the modem control features. When you attach a modem to the 25-pin connector, you must also enable the Comm1=RS-232 setting in the Global Set-Up screen.

If you select the 6-pin, DEC-423 connector on the VT420, you cannot use the modem control features.

  • Data Leads Only
Modem control pins on the DEC-423 or RS-232 connector are not used.
  • Modem Control
Uses DSR (pin 6) and DTR (pin 1) of the DEC-423 connector.
Disconnect delay Selects the delay time allowed for the VT420 to disconnect from a communication line. The VT420 disconnects when it no longer sees the receive line signal detection (RLSD) signal. The modem control must be enabled.
  • Disconnect, 2s Delay
Selects a 2-second delay (used in most countries except the United Kingdom).
  • Disconnect, 60 ms Delay
Selects a 60-millisecond delay (used in the United Kingdom).
  • No Disconnect
Does not disconnect from the line when the terminal loses RLSD.
Transmit rate limit
  • Limited Transmit
  • Unlimited Transmit
Selects whether or not to limit the terminal to sending 150 to 180 characters/second. A limited rate reduces the interrupt burden on the host system.
Auto answerback
  • No Auto Answerback
  • Auto Answerback
Selects whether or not to send the answerback message to the host system when establishing a connection.
Answerback = Lets you type an answerback message. You can use up to 30 characters. This prompt appears on the status line, indicating the start of the message. If you press the F3 (Set-Up) key while entering an answerback message, the VT420 deletes the new message and saves the old message.
Conceal answerback
  • Not Concealed
  • Concealed
Selects whether or not the VT420 will display the answerback message.

NOTE: If the conceal answerback feature is set to Concealed, you must enter a new answerback message before you can set it back to Not Concealed.

Modem high speed
  • Modem High Speed = Ignore

Selects a baud rate when the modem's speed indicator line is on. The modem control feature must be set to Modem Control.*

The VT420 uses the baud rates selected by the transmit speed and receive speed features. The baud rates range is from 300 to 38,400 bits/second.

Modem low speed
  • Modem Low Speed = Ignore

Selects a baud rate when the modem's speed indicator line is off. The modem control feature must be set to Modem Control.*

The VT420 uses the baud rates selected by the transmit speed and receive speed features. The baud rates range is from 300 to 38,400 bits/second.

Keyboard Set-Up Screen

This screen lets you control the operation of the keyboard. This includes the function of various keys and the keyboard's keyclick, warning bell, and margin bell.

The typewriter/data processing feature lets you select the standard typewriter layout or data processing layout on the keyboard. This setting affects keys that have characters on the right half on their keycaps. If you select Typewriter Keys, you can type all the legends on the left half of the keycaps. If you select Data Processing Keys, you can type all the legends on the right half of the keycaps.

Table 5-6 describes the Keyboard Set-Up features.

Table 5-6 Keyboard Set-Up Features
Feature and Settings Description
*The following keys never repeat: F1, F2, F3, F4, F5, Return, Ctrl, Alt Function, Compose Character, and lock.
† This feature applies only to the North American/United Kingdom keyboard.
Default settings are in bold type.
Typewriter/data processing Selects which characters are sent by data processing keys.
  • Typewriter Keys
Selects characters on the left half of the keycaps.
Data Processing Keys

Selects characters on the right half of the keycaps.

If character set mode is set to 7-bit Characters on the General Set-Up screen, the terminal uses the U.S. ASCII character set.

Caps/shift lock Selects the function of the lock key in the down position.
  • Caps Lock
When the lock key is down, the alphabetic keys send their uppercase character. Other keys still send the bottom character on their keycap.
  • Shift Lock
When the lock key is down, all keys send the shifted or top character on their keycap.
Auto repeat
  • Auto Repeat
  • No Auto Repeat
Selects whether or not a key sends its character repeatedly when you hold the key down.*
Keyclick
  • Keyclick High
  • Keyclick Low
  • Keyclick Off
Selects whether or not keys click when you press them. You can select a high or low volume.
Margin bell
  • Margin Bell Off
  • Margin Bell High
  • Margin Bell Low
Selects whether or not the VT420 bell sounds when the text cursor approaches the right margin. You can select a high or low volume.
Warning bell
  • Warning Bell High
  • Warning Bell Low
  • Warning Bell Off
Selects whether or not the VT420 bell rings when (1) operating errors occur or (2) the terminal receives CtrlG. You select a high or low volume.
Character mode Selects whether the keys send their normal characters or report their key position.
  • Character Mode
Selects ANSI/ISO character encoding for the keyboard.
  • Position Mode
The keyboard sends control strings that indicate the position of the key pressed.
Backarrow key Selects the function of the <×] key.
  • <×] Delete
<×] sends the DEL (delete) character.
  • <×] Backspace
<×] sends the BS (backspace) character.
Compose key Selects the function of the Compose Character keys (or Group Shift key on the German keyboard).
  • Local Compose
Compose Character starts a compose sequence (Chapter 6).
  • Report Compose
Compose Character sends a control string to the host to report each down or up key transition.
  • Ignore Compose
Compose Character keys are ignored.
Alt Function key Selects the function of the Alt Function keys.
  • Report Alt
Alt Function sends a control string to the host to report each up or down key transition.
  • Ignore Alt
Alt Function keys are ignored.
F1 = Selects the function of the F1 (Hold) key.
  • F1 = Hold
F1 stops the scrolling of text for the active session (Chapter 4).
  • F1 = Fkey
F1 (unshifted) sends a function key sequence to the host.
  • F1 = Ignore
F1 is ignored. This setting does not disable F1 for a copy and paste operation.
F2 = Selects the function of the F2 (Print) key.
  • F2 = Print
F2 performs the local print functions described in Chapter 8.
  • F2 = Fkey
F2 (unshifted) sends a function key sequence to the host.
  • F2 = Ignore
F2 is ignored.
F3 = Selects the function of the F3 (Set-Up) key.
  • F3 = Set-Up
F3 is used to enter or leave set-up.
  • F3 = Fkey
F3 (unshifted) sends a function key sequence to the host. To enter set-up after you disable this key; log out, turn off the terminal, wait 10 seconds, then turn on the terminal and make F3 the first key you press.
  • F3 = Ignore
F3 is ignored.
F4 = Selects the function of the F4 (Session) key.
  • F4 = Session
Pressing F4 switches the active session when you use two sessions (Chapter 8).
  • F4 = Fkey
F4 (unshifted) sends a function key sequence to the host.
  • F4 = Ignore
F4 is ignored.
F5 = Selects the function of the F5 (Break) key.
  • F5 = Break
F5 (unshifted) sends a break signal.
  • F5 = No Break
  • F5 (unshifted) is ignored.
  • F5 (shifted) performs a disconnect.
  • F5 = Fkey
F5 (unshifted) sends a function key sequence to the host.
  • F5 = Ignore
F5 is ignored.
,, and .. keys† Selects the function of the shifted comma and period keys.
  • ,, and .. Keys Send ,< and .>
The comma key sends a comma when unshifted and a < character when shifted. The period key sends a period when unshifted and a > character when shifted.
  • ,, and .. keys
The shifted comma key sends a comma. The shifted period key sends a period.
<> key† Selects the function of the <> angle bracket key.
  • <> Key
<> sends a < when unshifted and a > when shifted.
  • <> Key Sends `~
<> sends a ` when unshifted and a ~ when shifted.
`~ key† Selects the function of the `~ key.
  • `~ Key
`~ sends a ` when unshifted and a ~ when shifted.
  • `~ Key Sends ESC
`~ sends an escape (ESC) character.

Tab Set-Up Screen

This screen lets you set the number of tab stops on a line. Tab stops on the screen are similar to tab stops on a typewriter. When you press the Tab key outside of set-up, the cursor advances to the next tab stop. Table 5-7 describes the Tab Set-Up features.

There is one tab stop field for each column on the screen. You can use a screen display of 80 or 132 columns wide. See the 80/132 column mode feature in the Display Set-Up screen.

You can use the arrow keys or the Tab key to move the cursor to any tab stop field. Press the Enter key to place a T in a blank field or erase a T from that field. The following figure shows the default tab stop settings.

NOTE: You cannot put a tab in column 1.

Table 5-7 Tab Set-Up Features
Feature Description
Clear all tabs Removes all current tab settings shown on the Tab Set-Up screen.
Set 8 column tabs Automatically sets one tab every eight columns, starting at column 9.