Connecting to the Device :: Serial Port I/O (External Interfaces)

External Interfaces

Connecting to the Device

Before you can use the serial port object to write or read data, you must connect it to your device via the serial port specified in the serial function. You connect a serial port object to the device with the fopen function.

```
fopen(s)
```

Some properties are read-only while the serial port object is connected and must be configured before using fopen. Examples include the InputBufferSize and the OutputBufferSize properties. Refer to Property Reference to determine when you can configure a property.

Note You can create any number of serial port objects. However, you can connect only one serial port object to a given serial port at a time.

You can examine the Status property to verify that the serial port object is connected to the device.

```
s.Status
ans =
open
```

As illustrated below, the connection between the serial port object and the device is complete, and you can write and read data.

Connecting a serial port object and a device

Creating an Array of Serial Port Objects Configuring Communication Settings