
Code Abbr. Name Ctrl-x Typical usage
0013 DC3 Device control three Ctrl-S Pause data transmission
0014 DC4 Device control four Ctrl-T Deactivate ancillary device
0015 NAK Negative acknowledge Ctrl-U Negative response to sender
0016 SYN Synchronous idle Ctrl-V Synchronization of transmission
0017 ETB End of transmission block Ctrl-W Transmission of data in blocks
0018 CAN Cancel Ctrl-X Ignore preceding data
0019 EM End of medium Ctrl-Y End of medium or recorded data
001A SUB Substitute Ctrl-Z Indicates invalid/erroneous data
001B ESC Escape Ctrl-[ Starts a control command
001C FS File separator Ctrl-\ Delimits a set of data (file)
001D GS Group separator Ctrl-] Delimits a data group
001E RS Record separator Ctrl-^ Delimits a line or other record
001F US Unit separator Ctrl-_ Delimits a unit (field) of data
007F DEL Delete Data or time fill
The DEL character was originally used on punched tapes to delete a character by mak-
ing all seven bits to one. This explains its code position. Later it has been used as a fill
in a data stream. Do not confuse it with the effect of a Delete (or Del or Rubout) key,
which often sends the code for backspace (BS, Ctrl-H).
Normal plain text data seldom contains C0 Controls except CR and LF to indicate line
breaks, sometimes HT to indicate tabbing, and rarely VT or FF for vertical spacing.
When reading text data in a program, occurrences of other C0 Controls can ...