| Decimal | Symbol | Meaning |
|---|
| 0 | NUL | Null character |
| 1 | SOH | Start of Header |
| 2 | STX | Start of Text |
| 3 | ETX | End of Text |
| 4 | EOT | End of Transmission |
| 5 | ENQ | Enquiry |
| 6 | ACK | Acknowledgment |
| 7 | BEL | Bell |
| 8 | BS | Backspace |
| 9 | HT | Horizontal Tab |
| 10 | LF | Line feed |
| 11 | VT | Vertical Tab |
| 12 | FF | Form feed |
| 13 | CR | Carriage return |
| 14 | SO | Shift Out |
| 15 | SI | Shift In |
| 16 | DLE | Data Link Escape |
| 17 | DC1 | Device Control 1 (oft. XON) |
| 18 | DC2 | Device Control 2 |
| 19 | DC3 | Device Control 3 (oft. XOFF) |
| 20 | DC4 | Device Control 4 |
| 21 | NAK | Negative Acknowledgement |
| 22 | SYN | Synchronous idle |
| 23 | ETB | End of Transmission Block |
| 24 | CAN | Cancel |
| 25 | EM | End of Medium |
| 26 | SUB | Substitute |
| 27 | ESC | Escape |
| 28 | FS | File Separator |
| 29 | GS | Group Separator |
| 30 | RS | Record Separator |
| 31 | US | Unit Separator |
| 32 | SPC | Space |
| 33 to 126 are printable characters, '!' through '~' |
| 127 | DEL | Delete |