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HP OpenVMS Systems Documentation

HP OpenVMS DCL Dictionary

SET TERMINAL

Sets the characteristics of a terminal. Entering a qualifier changes a characteristic; omitting a qualifier leaves the characteristic unchanged.

Format

SET TERMINAL [device-name[:]]

Parameter

device-name[:]
Specifies the device name of the terminal. The default is SYS$COMMAND if that device is a terminal. If the device is not a terminal, an error message is displayed.

Description

The SET TERMINAL command modifies specific terminal characteristics for a particular application or overrides system default characteristics. (These defaults are defined at each installation, based on the most common type of terminal in use.) The default characteristics for terminals are listed in Figure DCLII-2. The table extends across two pages to document a range of terminals.
The terminal characteristics, local or remote, are determined automatically by the terminal driver for terminals that have the modem characteristic enabled. These characteristics are not affected by the SET TERMINAL command. For example, when you successfully dial in to an OpenVMS system processor, you establish your terminal as remote. When you hang up, the terminal characteristic is set back to local.
The set of terminals supported by the OpenVMS system includes a set of VT100 family terminals that support special DIGITAL ANSI characteristics and escape sequences. For a description of these special characteristics and escape sequences, refer to the HP OpenVMS I/O User's Reference Manual.
Figure DCLII-2 Default Characteristics for Terminals

Qualifiers

/ADVANCED_VIDEO

/NOADVANCED_VIDEO
Controls whether the terminal has advanced video attributes and is capable of 132-column video. If the terminal width is set to 132 columns and you specify the /ADVANCED_VIDEO qualifier, the terminal page limit is set to 24 lines. If you specify the /NOADVANCED_VIDEO qualifier, the terminal page limit is set to 14 lines.
/ALTYPEAHD
Causes the terminal driver to create a permanent, alternate type-ahead buffer. The system parameter TTY_ALTYPEAHD determines the size of the type-ahead buffer. This specification is effective at your next login and stays in effect until you reboot your VAX computer.
To enable /ALTYPEAHD, you must also set the qualifier /TYPE_AHEAD.
You should specify SETTERMINAL/PERMANENT/ALTYPEAHD in SYS$STARTUP:SYSTARTUP_VMS.COM for those communication lines that require this capability.
To use this feature interactively, specify SET TERMINAL/PERMANENT/ALTYPEAHD. This specification is effective at your next login.
/ANSI_CRT (default)

/NOANSI_CRT
Controls whether the terminal conforms to ANSI CRT programming standards. Because ANSI standards are a proper subset of the DEC_CRT characteristics, the default for all VT100 family terminals is /ANSI_CRT.
/APPLICATION_KEYPAD
Specifies that the keypad is to be set to application keypad mode, which allows you to enter DCL commands defined with the DEFINE/KEY command. By default, the terminal is set to numeric keypad mode.
/AUTOBAUD

/NOAUTOBAUD
Controls whether the terminal baud rate is set when you log in and sets the default terminal speed to 9600. You must press Return two or more times at intervals of at least 1 second for the baud rate to be determined correctly. If you press a key other than Return, the /AUTOBAUD qualifier may detect the wrong baud rate. If this happens, wait for the login procedure to time out before continuing. The /AUTOBAUD qualifier must be used with the /PERMANENT qualifier.
The valid baud rates are as follows:
50 150 1800 4800 38400 75 300 2000 7200 57600 110 600 2400 9600 76800 134 1200 3600 19200 115200
/BACKSPACE=keyword
Controls how the system responds to the backspace key (Ctrl/H) in line editing mode. There are two possible keywords:

BACKSPACE (default) --- The terminal driver returns the user to the beginning of the line. (This is the traditional way OpenVMS has always worked.)
DELETE --- The terminal driver interprets the backspace key as a delete character instruction.
Note the following exceptions:

If the terminal is set in PASSALL or PASTHRU mode, the backspace key is not interpreted as a delete character instruction.
If the user issues an IO$_READVBLK with IO$M_NOFILTR or IO$_READPBLK, the backspace key is not interpreted as a delete character instruction.

You can use SYSGEN to make /BACKSPACE=DELETE the default for all terminals by setting the system parameter TTY_DEFCHAR3 to 16.
If the default is set to DELETE, the user can still go to the start of a line by pressing F12 or by entering the following sequence: Ctrl/V Ctrl/H Ctrl/H.
If you use SET HOST, both the local node and the remote node must be capable of responding to your definition of the BACKSPACE key.
/BLOCK_MODE

/NOBLOCK_MODE
Controls whether block mode transmission, local editing, and field protection are performed.
/BRDCSTMBX

/NOBRDCSTMBX
Controls whether broadcast messages are sent to an associated mailbox if one exists.
/BROADCAST (default)

/NOBROADCAST
Controls whether reception of broadcast messages (such as those issued by MAIL and REPLY) is enabled. Specify the /NOBROADCAST qualifier when you are using a terminal as a noninteractive device or when you do not want special output to be interrupted by messages. Use the SET BROADCAST command to exclude certain types of messages from being broadcast, rather than eliminating all messages.
/COLOR
Sets the ANSI_COLOR terminal characteristic and identifies the terminal as capable of supporting the ANSI color escape sequences.
/COMMSYNC

/NOCOMMSYNC (default)
Allows connection of asynchronous printers and other devices to terminal ports, using standard modem control signals as flow control. Transmission to the device stops if either data set ready (DSR) or clear to send (CTS) EIA modem control signals are dropped. Transmission resumes when both signals are present.
The /COMMSYNC qualifier and the /MODEM qualifier are mutually exclusive.
The COMMSYNC feature has the following limitations:

Cannot be used on LAT ports
Can only be used on ports with full modem control
Should not be used in conjunction with Xon/Xoff flow control (the port may hang)

Caution
The /COMMSYNC qualifier should never be set on a line with a modem that is intended for interactive use. The qualifier disables the modem terminal characteristic that disconnects a user process from the terminal line in case of a modem phone line failure. With the /COMMSYNC qualifier enabled, the next call on the terminal line could be attached to the previous user's process. Security administrators should be aware that the characteristic should not be used on interactive terminal ports. In addition, the /COMMSYNC qualifier is not supported on a port connected to a LAT line.

/CRFILL[=fill-count]
Generates the specified number of null characters after each carriage return before transmitting the next meaningful character (to ensure that the terminal is ready for reception). The value must be an integer in the range 0 to 9. The default is the /CRFILL=0 qualifier.
/DEC_CRT[=(value1,value2,value3)]

/NODEC_CRT[=(value1,value2,value3)]
Controls whether the terminal conforms to DIGITAL VT100-, VT200-, VT300-, VT400-, or VT500-family standards and supports the minimum standards, including the additional DIGITAL escape sequences.
You can specify one of the following values:

1 (default) Requests that the DEC_CRT terminal characteristic be set.

2 Requests that the DEC_CRT2 terminal characteristic be set.

3 Requests that the DEC_CRT3 terminal characteristic be set. A level 3 terminal supports the following additional features:

A status line (line 25, at the bottom of the screen)
The ISO Latin1 character set
Terminal state interrogation (describes what state your terminal is in)

4 Requests that the DEC_CRT4 terminal characteristic be set. A level 4 terminal supports the following additional features:

Extended keyboard
Key position mode
Secure reset
Novice mode
Selective erase
On-line transaction processing (OLTP) features:

Page memory
Rectangular editing
Text macros
Data integrity reports

Note that DEC_CRT2, DEC_CRT3, and DEC_CRT4 are supersets of DEC_CRT. Clearing DEC_CRT causes DEC_CRT2, DEC_CRT3, and DEC_CRT4 to be cleared. Similarly, setting DEC_CRT4 causes all subsets of DEC_CRT4 (including ANSI_CRT) to be set.
/DEVICE_TYPE=terminal-type
Informs the system of the terminal type and sets characteristics according to the device type specified. You can specify any of the following terminal types:

UNKNOWN
FT1--FT8
LA12
LA34
LA36
LA38

LA100
LA120
LA210
LN01K
LN03
LQP02

PRO_SERIES
VT05
VT52
VT55
VT100
VT101

VT102
VT105
VT125
VT131
VT132
VT173

VT200
VT300
VT400
VT500

The default characteristics for the VT100-, VT102-, and VT125-series terminals are as follows:

/ADVANCEDVIDEO /NOALTYPEAHD ¹ /ANSI_CRT

/NOAUTOBAUD /NOBLOCK_MODE /NOBRDCSTMBX

/BROADCAST /CRFILL=0 /ECHO

/NOEIGHT_BIT /NOESCAPE /NOFORM

/FULLDUP /NOHOSTSYNC /LFFILL=0

/LOWERCASE /NODMA /PAGE=24

/NOPARITY /NOPASTHRU /NOREADSYN

/SPEED=9600 /TAB /TTSYNC

/TYPE_AHEAD /WIDTH=80 /WRAP

¹This is the default characteristic set by the system and is not a valid qualifier for your use.

The terminal types and characteristics that can be set are listed in Figure DCLII-2.

/DIALUP

/NODIALUP (default)

Controls whether the terminal is a dialup terminal.

/DISCONNECT

/NODISCONNECT (default)

Controls whether the process connected to this terminal is disconnected if the line detects a hangup. The /DISCONNECT qualifier is valid only when the /PERMANENT qualifier is specified.

/DISMISS

/NODISMISS (default)

Controls whether the terminal driver ignores data that causes a parity error (instead of terminating the currently outstanding I/O with an error status).

/DMA

/NODMA

Controls whether direct memory access (DMA) mode is used on a controller that supports this feature.

/ECHO (default)

/NOECHO

Controls whether the terminal displays the input it receives. With the /NOECHO qualifier, the terminal displays only system or user application output, or both.

/EDIT_MODE

/NOEDIT_MODE

Controls whether the terminal can perform ANSI-defined advanced editing functions.

/EIGHT_BIT

/NOEIGHT_BIT

Controls whether the terminal uses the 8-bit ASCII protocol rather than the 7-bit ASCII protocol. You can use the Terminal Fallback Facility (TFF) to set the 8-bit characteristic on terminals. If the terminal you specify has the TFF enabled, the /EIGHT_BIT qualifier has no effect. For more information on terminal fallback, refer to the OpenVMS Terminal Fallback Utility Manual (available on the Documentation CD-ROM).

/ESCAPE

/NOESCAPE (default)

Controls whether escape sequences are validated.

/FALLBACK

/NOFALLBACK

Controls whether the 8-bit DEC Multinational character set characters are displayed on the terminal in their 7-bit representation. The default depends on the /EIGHTBIT setting of the terminal. If the OpenVMS Terminal Fallback Facility (TFF) is enabled, it activates the default character conversion tables for the named terminal. For more information, refer to the OpenVMS Terminal Fallback Utility Manual (available on the Documentation CD-ROM). If TFF is not enabled on your system, the /FALLBACK qualifier has no effect and no error message is displayed.

/FORM

/NOFORM

Controls whether a form feed is transmitted rather than translated into multiple line feeds.

/FRAME=n

Specifies the number of data bits that the terminal driver expects for every character that is input or output. The value of n can be from 5 to 8. The default value depends on the settings for the terminal established by the /PARITY and /EIGHTBIT qualifiers.

/FULLDUP (default)

/NOFULLDUP

Controls whether the terminal operates in full-duplex mode. The /FULLDUP qualifier is equivalent to the /NOHALFDUP qualifier.

/HALFDUP

/NOHALFDUP (default)

Controls whether the terminal operates in half-duplex mode. The /HALFDUP qualifier is equivalent to the /NOFULLDUP qualifier.

/HANGUP

/NOHANGUP (default)

May require LOG_IO (logical I/O) or PHY_IO (physical I/O) privilege depending on system generation parameter settings.

Controls whether the terminal modem is hung up when you log out.

/HARDCOPY

/NOHARDCOPY

Controls whether the device is established as a hardcopy terminal and outputs a backslash (\) when the Delete key is pressed. The /HARDCOPY qualifier is equivalent to the /NOSCOPE qualifier.

/HOSTSYNC

/NOHOSTSYNC (default)

Controls whether system transmission from the terminal is stopped (by generating a Ctrl/S) when the input buffer is full and resumed (by generating a Ctrl/Q) when the input buffer is empty.

/INQUIRE

Sets the device type when the /INQUIRE qualifier is specified and the DEC_CRT characteristic is set. The SET TERMINAL command reads the current screen size from the terminal and sets the corresponding page length and page width values appropriately. The default device type is UNKNOWN. Works only on DIGITAL terminals, and not on LA36 or VT05 terminals. Some VT100 family terminals, including the VT101 and VT105, return a VT100 type response. LA38 terminals respond as LA43 terminals.

Note

The SET TERMINAL/INQUIRE command works correctly on DIGITAL supplied VT100 and later terminals. Some personal computer terminal emulators may not work correctly, because they do not correctly emulate all VT100 escape sequences. HP recommends that users who experience problems with these terminal emulators contact the terminal emulator supplier.

You can include the SET TERMINAL/INQUIRE command in your LOGIN.COM file to detect the terminal type automatically.

If you specify /INQUIRE=OLD, OpenVMS sets the terminal window to 24 lines by 80 columns and ignores the real terminal size. (This is the behavior of the SET TERMINAL/INQUIRE command prior to OpenVMS Version 6.2.)

Caution

This qualifier clears the type-ahead buffer. If the response sequence is unrecognized, no action message or error message is displayed. The /INQUIRE qualifier should be used only on DIGITAL terminals; however, the LA36 and VT05 terminals do not support this feature.

/INSERT

Sets the terminal to insert mode. This feature allows you to insert characters when editing command lines. The default mode is overstrike, which allows you to type over the current character when editing a command line. Press Ctrl/A to switch from one mode to the other.

/LFFILL[=fill-count]

Transmits to the terminal the specified number of null characters after each line feed before transmitting the next meaningful character (to ensure that the terminal is ready for reception). The value must be an integer in the range 0 to 9. The default is installation dependent. See Figure DCLII-2 for a list of default terminal characteristics.

/LINE_EDITING

/NOLINE_EDITING

Controls whether advanced line-editing features are enabled for editing command lines: pressing Return and pressing Ctrl/Z are recognized as line terminators, as are escape sequences.

/LOCAL_ECHO

/NOLOCAL_ECHO (default)

Controls whether the terminal echoes characters locally (rather than the host echoing them) for command level terminal functions. (Do not use the /LOCAL_ECHO qualifier with utilities that require control over echoing, such as line editing or EDT's screen mode.)

Caution

When logging in to terminals with the LOCAL_ECHO characteristic, the OpenVMS system has no control over the echoing of passwords.

/LOWERCASE

/NOLOWERCASE

Controls whether lowercase characters are passed to the terminal. The /NOLOWERCASE qualifier translates all input to uppercase. The /LOWERCASE qualifier is equivalent to the /NOUPPERCASE qualifier.

/MANUAL

Indicates manual switching of terminal lines to dynamic asynchronous DDCMP lines when your local terminal emulator does not support automatic switching. The /MANUAL qualifier should be specified with the /PROTOCOL=DDCMP and /SWITCH=DECNET qualifiers.

/MODEM

/NOMODEM

Specifies whether the terminal is connected to a modem or a cable that supplies standard EIA modem control signals. If your terminal has the MODEM characteristic, entering SET TERMINAL/NOMODEM automatically logs you out. The /MODEM qualifier and the /COMMSYNC qualifier are mutually exclusive.

/NUMERIC_KEYPAD (default)

Specifies whether the keys of the numeric keypad are used to type numbers and punctuation marks (/NUMERIC_KEYPAD) or to enter DCL commands defined with the DEFINE/KEY command (/APPLICATION_KEYPAD).

/OVERSTRIKE (default)

Sets the terminal to overstrike mode. This feature allows you to type over the current character when you are editing a command line. Set your terminal to insert mode if you want to insert characters when editing command lines. Press Ctrl/A to switch from one mode to the other.

/PAGE[=lines-per-page]

Specifies the number of print lines between perforations for hardcopy terminals. (When the terminal reads a form feed, it advances the paper to the next perforation.) The value of the lines-per-page parameter can be from 0 to 255 and defaults to 0 (which treats a form feed as a line feed).

/PARITY[=option]

/NOPARITY (default)

Controls whether the terminal passes data with only odd or even parity, where option equals ODD or EVEN. If you specify the /PARITY qualifier without an option, the value defaults to EVEN.

/PASTHRU

/NOPASTHRU (default)

Controls whether the terminal passes all data (including tabs, carriage returns, line feeds, and control characters) to an application program as binary data. The setting of /TTSYNC is allowed.

Make sure that you spell both these qualifiers exactly as they appear in the text.

/PERMANENT

Requires LOG_IO (logical I/O) or PHY_IO (physical I/O) privilege.

Sets characteristics on a permanent basis, that is, over terminal sessions; however, the characteristics revert to their initial values if the system is halted and restarted. Use in a system startup file to establish characteristics for all terminals on the system.

/PRINTER_PORT

/NOPRINTER_PORT

Specifies whether the terminal has a printer port (an attribute not set by the SET TERMINAL/INQUIRE command). The default is installation dependent. See Figure DCLII-2 for a list of default terminal characteristics.

/PROTOCOL=DDCMP

/PROTOCOL=NONE (default)

On VAX, controls whether the terminal port specified is changed into an asynchronous DDCMP line. The /PROTOCOL=NONE qualifier changes an asynchronous DDCMP line back into a terminal line. Note that /PROTOCOL=DDCMP is a permanent characteristic; therefore, the /PERMANENT qualifier is not required.

/READSYNC

/NOREADSYNC (default)

Controls whether the terminal uses the Ctrl/S and Ctrl/Q functions to synchronize data transmitted from the terminal.

Caution

SET TERMINAL/READSYNC should not be used on LAT terminal lines. Setting this characteristic may cause unexpected results.

The default is the /NOREADSYNC qualifier; the system does not use the Ctrl/S and Ctrl/Q functions to control reads to the terminal. The /READSYNC qualifier is useful for certain classes of terminals that demand synchronization or for special-purpose terminal lines where data synchronization is appropriate.

/REGIS

/NOREGIS

Specifies whether the terminal understands ReGIS graphic commands.

/SCOPE

/NOSCOPE

Controls whether the device is established as a video terminal. The /SCOPE qualifier is equivalent to the /NOHARDCOPY qualifier.

/SECURE_SERVER

/NOSECURE_SERVER (default)

Requires either LOG_IO (logical I/O) or PHY_IO (physical I/O) privilege.

Controls whether the Break key on the terminal logs out the current process (except on a virtual terminal). With the /SECURE_SERVER qualifier in effect, pressing the Break key when there is no current process initiates the login sequence. With the /NOSECURE_SERVER qualifier in effect, the break is ignored.

On terminals with the AUTOBAUD and SECURE_SERVER characteristics, pressing the Break key disconnects the current process, but is not required to start a new login sequence. However, when the NOAUTOBAUD characteristic is set, the SECURE_SERVER characteristic requires a break to initiate a new login sequence.

/SET_SPEED

/NOSET_SPEED

Requires either LOG_IO (logical I/O) or PHY_IO (physical I/O) privilege.

Controls whether the /SPEED qualifier can be used to change the terminal speed.

/SIXEL_GRAPHICS

/NOSIXEL_GRAPHICS

Specifies whether the terminal is capable of displaying graphics using the sixel graphics protocol. The default is device dependent. For a list of default terminal characteristics, see Figure DCLII-2.

/SOFT_CHARACTERS

/NOSOFT_CHARACTERS

Specifies whether the terminal is capable of loading a user-defined character set. The default is device dependent. See Figure DCLII-2 for a list of default terminal characteristics.

/SPEED=(input-rate,output-rate)

Sets the baud rate at which the terminal receives and transmits data. If the input and output rates are the same, specify /SPEED=rate.

Not all terminals support different input and output baud rates. For specific information on baud rates for your terminal, consult the manual for that terminal.

The default transmission rates are installation dependent.

The valid values for input and output baud rates are as follows:

 50       150       1800       4800       38400
 75       300       2000       7200       57600
110       600       2400       9600       76800
134      1200       3600      19200      115200

/SWITCH=DECNET

On VAX, causes the terminal lines at each node to be switched to dynamic asynchronous DDCMP lines, when specified with the /PROTOCOL=DDCMP qualifier. Note that /SWITCH=DECNET is a permanent characteristic; therefore, the /PERMANENT qualifier is not required.

/SYSPASSWORD

/NOSYSPASSWORD (default)

Requires LOG_IO (logical I/O) privilege.

Determines whether the terminal requires that a system password be entered before the Username: prompt.

/TAB

/NOTAB

Controls whether tab characters are converted to multiple blanks. The /NOTAB qualifier expands all tab characters to blanks and assumes tab stops at 8-character intervals. The default is device dependent. For a list of default terminal characteristics, see Figure DCLII-2.

/TTSYNC (default)

/NOTTSYNC

Controls whether transmitting to the terminal is stopped when Ctrl/S is pressed and resumes transmission when Ctrl/Q is pressed.

/TYPE_AHEAD (default)

/NOTYPE_AHEAD

Controls whether the terminal accepts unsolicited input to the limit of the type-ahead buffer.

When you specify the /NOTYPE_AHEAD qualifier, the terminal accepts input only when a program or the system issues a read to the terminal, such as for user input at the DCL prompt ($). When you specify the /TYPE_AHEAD qualifier, the amount of data that can be accepted is governed by the size of the type-ahead buffer. That size is determined by system generation parameters.

/UNKNOWN

Specifies a terminal type that is unknown to the system, which then uses the default terminal characteristics for unknown terminals. For a summary of the settings, see Figure DCLII-2.

/UPPERCASE

/NOUPPERCASE

Controls whether lowercase characters are translated to uppercase. The /UPPERCASE qualifier is equivalent to the /NOLOWERCASE qualifier.

/WIDTH=characters-per-line

Specifies the maximum characters per line. This value must be an integer in the range 1 to 511. With the /WRAP qualifier, the terminal generates a carriage return and line feed when the width specification is reached.

If the specified width on an ANSI terminal is 132, the screen is set to 132-character mode. If the terminal does not have advanced video option (AVO), the page length limit is set to 14 lines.

/WRAP (default)

/NOWRAP

Controls whether a carriage return and line feed are generated when the value of the /WIDTH qualifier is reached.

Examples

#1
$ SET TERMINAL/DEVICE=VT102

In this example, the SET TERMINAL command establishes the current terminal as a VT102 terminal and sets the default characteristics for that terminal type.

#2
$ SET TERMINAL/WIDTH=132/PAGE=60/NOBROADCAST $ TYPE MEMO.DOC . . . $ SET TERMINAL/DEVICE=LA36

In this example, the first SET TERMINAL command indicates that the width of terminal lines is 132 characters and that the size of each page is 60 lines. The /NOBROADCAST qualifier disables the reception of broadcast messages while the terminal is printing the file MEMO.DOC. The next SET TERMINAL command restores the terminal to its default state.

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