# xonoff command

The xonoff BASIC program disables or
enables x-on/x-off on a specified port, or the
current port.

## Syntax

```
 xonoff {(options}
```

## Parameter(s)

| options | port.number | Integer number that indicates the port number. |
| --- | --- | --- |
| f | Sets the xon/xoff command to Off. | |
| n | Sets the xon/xoff command to On. This is the default setting. | |
| s | Suppresses the output of the status message. | |
When the xon/xoff capability is On:

- CTRL+S stops output from displaying on the terminal.

- CTRL+Q resumes the display.

- If no options are specified, you will see the status.

The xon and xoff commands are used for flow control to
 printers and other devices.

## Example(s)

**Example 1**

```

 xonoff
 [1314] xon/off is enabled.
```

 **Example 2**

```

 xonoff (f
 [1315] xon/off is disabled.
```

 **Example 3**

```

 xonoff (n
 [1314] xon/off is enabled.
```

## See also

- [dtr-on command](https://d3codex.com/tcl/cdtr-on-command/)
- [list-lines command](https://d3codex.com/tcl/list-lines-command/)
- [modem-off macro](https://d3codex.com/tcl/modem-off-macro/)
- [modem-on macro](https://d3codex.com/tcl/modem-on-macro/)
- [Port number](https://d3codex.com/definitions/port-number/)
- [reset-port command](https://d3codex.com/tcl/reset-port-command/)
- [wheres command](https://d3codex.com/tcl/wheres-command/)

---
Source: https://d3codex.com/tcl/xonoff-command/ - part of the D3Codex reference.