MATLAB Release Notes

External Interfaces/API Problems

Available Serial Ports on Windows 98

On Windows 98 platforms, you can access no more than four serial ports. The four serial ports are labeled COM1 through COM4.

The COM1 and COM2 serial ports are standard components of your Windows platform. You can add two additional serial ports, COM3 and COM4. If you have more than four serial ports, you can access only the first four ports. If you try to access a port that does not exist, MATLAB will return the following error message after the fopen function is issued.

• s = serial('COM3');
  fopen(s)
  ??? Error using ==> serial/fopen
  Error using ==> fopen
  Cannot connect to the COM3 port. Possible reasons are another 
  application is connected to the port or the port does not exist.
  

Accessing Serial Ports on Solaris

If you repeatedly open and close one or more serial ports on Solaris, MATLAB will become unresponsive. To minimize the chance of encountering this problem, you should:

• Use only one serial port on your platform.
• Connect the serial port object to your device once per MATLAB session.

Development Environment Problems

Graphics Problems