ESPTerm emulates VT102 (pictured) with some additions from later VT models and Xterm. All commonly used attributes and commands are supported. ESPTerm is capable of displaying ncurses applications such as _Midnight Commander_ using _agetty_.
ESPTerm accepts UTF-8 characters received on the communication UART and displays them on the screen, interpreting some codes as Control Characters. Those are e.g. _Carriage Return_ (13), _Line Feed_ (10), _Tab_ (9), _Backspace_ (8) and _Bell_ (7).
Escape sequences start with the control character _ESC_ (27), followed by any number of ASCII characters forming the body of the command.
Nomenclature & Command Types
Examples on this help page use the following symbols for special characters and command types:\\ (spaces are for clarity only, _DO NOT_ include them in the commands!)
| Name | Symbol | ASCII | C string | Function |
|---|---|---|---|---|
| *ESC* | `\e` | `ESC` (27) | `"\e"`, `"\x1b"`, `"\033"` | Introduces an escape sequence. _(Note: `\e` is a GCC extension)_ |
| *Bell* | `\a` | `BEL`~(7) | `"\a"`, `"\x7"`, `"\07"` | Audible beep |
| *String Terminator* | `ST` | `ESC \`~(27~92) _or_~`\a`~(7) |
`"\x1b\\"`, `"\a"` | Terminates a string command (`\a` can be used as an alternative) |
| *Control Sequence Introducer* | `CSI` | `ESC [` | `"\x1b["` | Starts a CSI command. Examples: `\e[?7;10h`, `\e[2J` |
| *Operating System Command* | `OSC` | `ESC ]` | `"\x1b]"` | Starts an OSC command. Is followed by a command string terminated by `ST`. Example: `\e]0;My Screen Title\a` |
| *Select Graphic Rendition* | `SGR` | `CSI n;n;nm` | `"\x1b[1;2;3m"` | Set text attributes, like color or style. 0 to 10 numbers can be used, `\e[m` is treated as `\e[0m` |
There are also some other commands that don't follow the CSI, SGR or OSC pattern, such as `\e7` or `\e#8`. A list of the most important escape sequences is presented in the following sections.