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The MATLAB® serial port interface provides direct access to peripheral devices such as modems, printers, and scientific instruments that you connect to your computer's serial port. This interface is established through a serial port object. The serial port object supports functions and properties that allow you to
Configure serial port communications
Use serial port control pins
Write and read data
Use events and callbacks
Record information to disk
Instrument Control Toolbox™ software provides additional serial port functionality. In addition to command-line access, this toolbox has a graphical tool called the Test & Measurement Tool, which allows you to communicate with, configure, and transfer data with your serial device without writing code. The Test & Measurement Tool generates MATLAB code for your serial device that you can later reuse to communicate with your device or to develop GUI-based applications. The toolbox includes additional serial I/O utility functions that facilitate object creation and configuration, instrument communication, and so on. With the toolbox you can communicate with GPIB- or VISA-compatible instruments.
If you want to communicate with PC-compatible data acquisition hardware such as multifunction I/O boards, you need Data Acquisition Toolbox™ software.
For more information about these products, visit the MathWorks Web site at http://www.mathworks.com/products.
Over the years, several serial port interface standards have been developed. These standards include RS-232, RS-422, and RS-485 - all of which are supported by the MATLAB serial port object. Of these, the most widely used interface standard for connecting computers to peripheral devices is RS-232.
This guide assumes you are using the RS-232 standard, discussed in Overview of the Serial Port. Refer to your computer and device documentation to see which interface standard you can use.
The MATLAB serial port interface is supported on:
Mac OS X
Mac OS X 64-bit
Microsoft® Windows® 32-bit
Microsoft Windows 64-bit
Many of the examples in this section reflect specific peripheral devices connected to a serial port — in particular a Tektronix® TDS 210 two-channel oscilloscope connected to the COM1 port, on a Windows platform. Therefore, many of the string commands are specific to this instrument and platform.
If you are using a different platform, or your peripheral device is connected to a different serial port, or if it accepts different commands, modify the examples accordingly.