ASCII code for device control 1 (xon)
17
Device Control 1 (XON) — a control character, not printable
| Decimal | 17 |
| Hexadecimal | 0x11 |
| Octal | 0021 |
| Binary | 00010001 |
| HTML entity |  |
What it is
Also called XON. Resumes a paused transmission. This is what Ctrl+Q sends, and why a terminal that has mysteriously frozen often unfreezes when you press it.
The full entry
ASCII 17 in full — the code point page, with what sits either side of it and how the character is encoded elsewhere.
Frequently asked questions
What is the ASCII code for device control 1 (xon)?
The ASCII code for device control 1 (xon) is 17 in decimal, 0x11 in hexadecimal and 0021 in octal.
What is device control 1 (xon) in binary?
00010001 — eight bits, though ASCII only defines seven, so the top bit is always zero.
Is device control 1 (xon) a printable character?
No. Device Control 1 (XON) is a control character — an instruction to a teleprinter rather than a mark on paper, which is why most tables show an empty cell for it.
Other characters
- ASCII code for device control 2 — 18
- ASCII code for device control 3 (xoff) — 19
- ASCII code for device control 4 — 20
- ASCII code for negative acknowledge — 21
- ASCII code for synchronous idle — 22
- ASCII code for end of transmission block — 23
- ASCII code for cancel — 24
- ASCII code for end of medium — 25
- ASCII code for substitute — 26
- ASCII code for escape — 27
- ASCII code for file separator — 28
- ASCII code for group separator — 29
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