DECRQM—Request Mode - Host To Terminal
The host sends this control function to find out if a particular mode is set or reset. The terminal responds with a report mode function (DECRPM—Report Mode - Terminal To Host).
DECRQM functions in ANSI and DEC modes.
Requesting ANSI Modes
| CSI 9/11 |
Pa 3/n |
$ 2/4 |
p 7/0 |
Requesting DEC Modes
| CSI 9/11 |
? 3/15 |
Pd 3/n |
$ 2/4 |
p 7/0 |
Parameters
Pa
indicates the ANSI mode that the host is asking about. Table 5–7 lists the values
for Pa.
Pd
indicates the DEC mode the host is asking about. Table 5–8 lists the values for
Pd.
Examples
The following sequences request the setting of some ANSI modes:
| Host | Meaning |
|---|---|
| CSI 2 $ p | What is the current state of keyboard action mode (KAM)? (KAM = 2) |
| CSI 4 $ p | What is the current state of insert/replace mode (IRM)? (IRM = 4) |
The following sequences request the setting of some DEC modes:
| Host | Meaning |
|---|---|
| CSI ? 36 $ p | What is the current state of Hebrew encoding mode (DECHEM)? (DECHEM = 36) |
| CSI ? 6 $ p | What is the current state of origin mode (DECOM)? (DECOM = 6) |
Notes on DECRQM
- The terminal does not respond to a DECRQM sequence when in VT52 mode.
- A DECRQM sequence can only ask about one mode at a time.
| Mode | Mnemonic | Pa |
|---|---|---|
| Guarded area transfer | GATM* | 1 |
| Keyboard action | KAM | 2 |
| Control representation | CRM† | 3 |
| Insert/replace | IRM | 4 |
| Status reporting transfer | SRTM* | 5 |
| Vertical editing | VEM* | 7 |
| Horizontal editing | HEM* | 10 |
| Positioning unit | PUM* | 11 |
| Send/receive | SRM | 12 |
| Format effector action | FEAM* | 13 |
| Format effector transfer | FETM* | 14 |
| Multiple area transfer | MATM* | 15 |
| Transfer termination | TTM* | 16 |
| Selected area transfer | SATM* | 17 |
| Tabulation stop | TSM* | 18 |
| Editing boundary | EBM* | 19 |
| Line feed/new line | LNM | 20 |
*This control function is permanently reset. †The host cannot change the setting of CRM. You can only change CRM from Set-Up. If CRM is set, then the terminal ignores DECRQM and most other control functions. |
||
| Mode | Mnemonic | Pd |
|---|---|---|
| Cursor keys | DECCKM | 1 |
| ANSI | DECANM | 2 |
| Column | DECCOLM | 3 |
| Scrolling | DECSCLM | 4 |
| Screen | DECSCNM | 5 |
| Origin | DECOM | 6 |
| Autowrap | DECAWM | 7 |
| Autorepeat | DECARM | 8 |
| Print form feed | DECPFF | 18 |
| Printer extent | DECPEX | 19 |
| Text cursor enable | DECTCEM | 25 |
| Cursor direction, right to left | DECRLM | 34 |
| Hebrew keyboard mapping | DECHEBM | 35 |
| Hebrew encoding mode | DECHEM | 36 |
| National replacement character set | DECNRCM | 42 |
| Greek keyboard mapping | DECNAKB | 57 |
| Horizontal cursor coupling | DECHCCM* | 60 |
| Vertical cursor coupling | DECVCCM | 61 |
| Page cursor coupling | DECPCCM | 64 |
| Numeric keypad | DECNKM | 66 |
| Backarrow key | DECBKM | 67 |
| Keyboard usage | DECKBUM | 68 |
| Vertical split screen | DECVSSM / DECLRMM | 69 |
| Transmit rate limiting | DECXRLM | 73 |
| Key position | DECKPM | 81 |
| No clearing screen on column change | DECNCSM | 95 |
| Cursor right to left | DECRLCM | 96 |
| CRT save | DECCRTSM | 97 |
| Auto resize | DECARSM | 98 |
| Modem control | DECMCM | 99 |
| Auto answerback | DECAAM | 100 |
| Conceal answerback message | DECCANSM | 101 |
| Ignoring null | DECNULM | 102 |
| Half-duplex | DECHDPXM | 103 |
| Secondary keyboard language | DECESKM | 104 |
| Overscan | DECOSCNM | 106 |
*This control function is permanently reset. |
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