DC3
Device Control Three (XOFF)
ControlASCII 19 | Hex 0x13 | U+0013
DC3 (code 19), known as XOFF, pauses data transmission in software flow control. When a receiving device's buffer fills up, it sends XOFF (Ctrl+S) to tell the sender to stop. The sender resumes only after receiving XON (DC1, Ctrl+Q). This protocol works over any serial link without dedicated hardware flow control lines (RTS/CTS), but it cannot be used on binary data channels because a data byte matching 0x13 would falsely trigger a pause.
ASCII Code
Decimal
19
Hexadecimal
0x13
Octal
23
Binary
0001 0011
Unicode
Code Point
U+0013
Escape
\u0013
UTF-8 Hex
0xE2 0x90 0x93
UTF-8 Binary
111000101001000010010011
UTF-16
0x0013
UTF-32
0x00000013
HTML Entities
Numeric

Hex

How to Type
HTML Entity

Unicode InputU+0013
Source Code Representations
C / Java
"\u0013"CSS
\0013JavaScript
"\u0013"Perl
\x{0013}Python 2
u"\u0013"Python 3
\u0013Ruby
\u{0013}Frequently Asked Questions
What is ASCII code 19?
ASCII code 19 represents the Device Control Three (XOFF) character. In hexadecimal it is 0x13, in binary 0001 0011, and in octal 23. This is a non-printable control character used for device signaling and data transmission control.
How do I type ASCII 19 on a keyboard?
Control characters are typically entered using Ctrl key combinations. For example, Ctrl+S produces ASCII 19 in most terminal emulators. You can also use the HTML entity  in web pages.