# serial.close

## Function

Close the open serial port.

## Syntax

```bt
device.open(config).close()
```

## Parameters

No parameters.

## Return value

| Type | Description |
| ------ | ------ |
| Bool | Returns true if the shutdown is successful. |

## Example

```bt
port = device.open({type: 'serial', port: 'COM3'})
result = port.close()

// Output: true
print result
```

## Notes

- The handle remains the Device value after closing, but the underlying port is closed.