ASCII 19
ASCII 19 is Device Control 3 (XOFF) — the control character DC3.
Every representation
| Character | DC3 (not printable) |
| Name | Device Control 3 (XOFF) |
| Decimal | 19 |
| Hexadecimal | 0x13 |
| Octal | 0023 |
| Binary | 00010011 |
| HTML entity |  |
| Escape sequence | \x13 |
| Unicode | U+0013 |
| Keyboard | Ctrl+S |
| Group | Control character |
What it is for
Also called XOFF. Pauses transmission so a slow device can catch up. Ctrl+S sends it, which is the usual explanation for a terminal that suddenly stops responding to keystrokes.
Where the number comes from
Codes 0 to 31 were reserved for control: instructions to a teleprinter rather than characters to print. Code 19 is Ctrl+S because the Ctrl key was originally wired to clear the top two bits of whatever you typed, mapping the letter S at 83 down to 19.
Frequently asked questions
What is ASCII 19?
Device Control 3 (XOFF) (DC3), a control character. In hexadecimal it is 0x13, in octal 0023, and in binary 00010011.
How do I type ASCII 19?
Press Ctrl+S in a terminal. In a string literal you can write it as \\x13 in most languages.
Is ASCII 19 printable?
No. Codes 0 to 31 and 127 are control characters — they were instructions to a teleprinter rather than marks on paper, and most terminals show nothing for them.
Nearby codes
- ASCII 12 — FF
- ASCII 13 — CR
- ASCII 14 — SO
- ASCII 15 — SI
- ASCII 16 — DLE
- ASCII 17 — DC1
- ASCII 18 — DC2
- ASCII 20 — DC4
- ASCII 21 — NAK
- ASCII 22 — SYN
- ASCII 23 — ETB
- ASCII 24 — CAN
- ASCII 25 — EM
- ASCII 26 — SUB
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