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Control Functions, Escape Sequences, and VT-Keys
Technical Note 1364
Last Reviewed 07-May-2004
Applies To
Reflection for HP version 10.0 or higher
Reflection for UNIX and OpenVMS version 10.0 or higher
Reflection for ReGIS Graphics version 10.0 or higher
Summary
Technical Note 1364
Last Reviewed 07-May-2004
Applies To
Reflection for HP version 10.0 or higher
Reflection for UNIX and OpenVMS version 10.0 or higher
Reflection for ReGIS Graphics version 10.0 or higher
Summary
This technical note contains information about control functions, escape sequences, and VT-keys and how they interact with Reflection.
Using Control Functions
Control functions sent by the host to a terminal cause specific actions, such as moving the text cursor, adding a line of text, assigning character attributes, and changing character sets.
There are four symbols used in this section that describe a sequence:
- Csi stands for the Control Sequence Introduction character; when Reflection receives this character, it recognizes the string that follows as a control sequence.
- Esc stands for the Escape character, and begins an escape sequence.
- Dcs stands for the Device Control String character, and begins a device control sequence.
- Ss3 stands for the Single Shift-3 character.
To use the functions, you must know what keystrokes send a sequence in a 7-bit environment.
In a terminal window, press the key or key combination shown below:
| Esc |
Press the Esc key. |
| Csi |
Press the Esc+[ keys. |
| Dcs |
Press the Esc+P keys. |
| Ss3 |
Press the Esc+O keys. |
In a command line, enter the characters shown below:
| Esc |
Chr$(27) |
| Csi |
Chr$(27) & "[" |
| Dcs |
Chr$(27) & "P" |
| Ss3 |
Chr$(27) & "O" |
Note: The capital letters "P" and "O" are case sensitive.
Typical uses of escape sequences include keyboard remapping or scripting commands to simulate VT function- or numeric-key strokes. See the sample command at the end of this document.
Codes Sent by the Arrow Keys
The following table shows codes sent by the arrow keys. The codes sent in ANSI mode apply only to VT100-VT300 modes; the VT52 terminal is not compatible with ANSI mode.
| Key |
Numeric |
ANSI Mode Application |
VT52 Mode Cursor or Application |
| Up |
CsiA |
Ss3A |
EscA |
| Dn |
CsiB |
Ss3B |
EscB |
| Rt |
CsiC |
Ss3C |
EscC |
| Lt |
CsiD |
Ss3D |
EscD |
Codes Sent by Editing and VT Function Keys
The following table shows the codes sent by the six editing keys and the VT function keys F6-F20 when you're in VT200 or VT300 mode (only three of the keys are recognized in VT52 and VT100 modes, as noted).
| VT Keystroke |
Generated Code |
| Find |
Csi1~ |
| Insert Here |
Csi2~ |
| Remove |
Csi3~ |
| Select |
Csi4~ |
| Prev Screen |
Csi5~ |
| Next Screen |
Csi6~ |
| F6 |
Csi17~ |
| F7 |
Csi18~ |
| F8 |
Csi19~ |
| F9 |
Csi20~ |
| F10 |
Csi21~ |
| F11 (ESC) |
Csi23~ (Esc in VT52/VT100 modes) |
| F12 (BS) |
Csi24~ (Bs in VT52/VT100 modes) |
| F13 (LF) |
Csi25~ (Lf in VT52/VT100 modes) |
| F14 |
Csi26~ |
| F15 (Help) |
Csi28~ |
| F16 (Do) |
Csi29~ |
| F17 |
Csi31~ |
| F18 |
Csi32~ |
| F19 |
Csi33~ |
| F20 |
Csi34~ |
Codes Sent by the Numeric Keypad
The following table shows the codes sent by the numeric keypad keys.
The codes sent in ANSI mode apply only to VT100-VT300 modes; the VT52 terminal is not compatible with ANSI mode.
| Key |
Numeric |
ANSI Mode Application |
Numeric |
VT52 Mode Application |
| 0 |
0 |
Ss3p |
0 |
Esc?p |
| 1 |
1 |
Ss3q |
1 |
Esc?q |
| 2 |
2 |
Ss3r |
2 |
Esc?r |
| 3 |
3 |
Ss3s |
3 |
Esc?s |
| 4 |
4 |
Ss3t |
4 |
Esc?t |
| 5 |
5 |
Ss3u |
5 |
Esc?u |
| 6 |
6 |
Ss3v |
6 |
Esc?v |
| 7 |
7 |
Ss3w |
7 |
Esc?w |
| 8 |
8 |
Ss3x |
8 |
Esc?x |
| 9 |
9 |
Ss3y |
9 |
Esc?y |
| - |
(minus) |
Ss3m |
- |
Esc?m |
| , |
(comma) |
Ss3l |
, |
Esc?l |
| . |
(period) |
Ss3n |
. |
Esc?n |
| Enter |
Cr or |
Ss3M |
Cr or |
Esc?M |
| |
CrLf |
|
CrLf |
|
| PF1 |
Ss3P |
Ss3P |
EscP |
EscP |
| PF2 |
Ss3Q |
Ss3Q |
EscQ |
EscQ |
| PF3 |
Ss3R |
Ss3R |
EscR |
EscR |
| PF4 |
Ss3S |
Ss3S |
EscS |
EscS |
Sample Command
To access a command line in Reflection, press Alt+L. Enter a command to transmit a control function or escape sequence, such as the sample command shown below:
.Transmit Chr$(27) & "OP"
Additional Resources
For complete documentation of control functions and escape sequences, see the Reflection VT Terminal Reference at http://support.attachmate.com/manuals/rhpuo.html.
