(Not recommended) Connect serial port object to device
This serial object function is not recommended. Use serialport
object functions instead. See Compatibility Considerations.
fopen(obj)
fopen(obj) connects the serial port object,
obj to the device.
This example creates the serial port object s, connects
s to the device using fopen, writes and
reads text data, and then disconnects s from the device. This example
works on a Windows® platform.
s = serial('COM1'); fopen(s) fprintf(s,'*IDN?') idn = fscanf(s); fclose(s)
Before you can perform a read or write operation, obj must be
connected to the device with the fopen function. When
obj is connected to the device:
Data remaining in the input buffer or the output buffer is flushed.
The Status property is set to
open.
The BytesAvailable, ValuesReceived,
ValuesSent, and BytesToOutput
properties are set to 0.
An error is returned if you attempt to perform a read or write operation while
obj is not connected to the device. You can connect only one
serial port object to a given device.
Some properties are read-only while the serial port object is open (connected), and
must be configured before using fopen. Examples include
InputBufferSize and OutputBufferSize.
Refer to the property reference pages to determine which properties have this
constraint.
The values for some properties are verified only after obj is
connected to the device. If any of these properties are incorrectly configured, then an
error is returned when fopen is issued and obj
is not connected to the device. Properties of this type include
BaudRate, and are associated with device settings.