MATLAB to control the serial port voltage

absoluthish · Apr 23, 2007

Hi
i m trying to control(ON/OFF) a LED using the serial port on the MATLAB .. up till now all i found that the MATLAB only sends a string or binary to the port
can anyone help me on how to control the voltage on the serial port pins ?
thanks in advance
Hisham

IRstuff · Apr 23, 2007

As a computer professional, you should already know that RS-232 does not allow for voltage adjustment

TTFN

FAQ731-376

absoluthish · Apr 23, 2007

As a Computer Professional i already know that pin4 and pin7 in the RS232 change polarity during the transmission and reception ..
my problem is that i need to control these pins
thanks for your generous help

Hisham

IRstuff · Apr 23, 2007

It changes polarity because it SWITCHES between the FIXED positive supply and the FIXED negative supply. There is no programming of the voltages.

TTFN

FAQ731-376

cev · Apr 24, 2007

If you are trying to do a binary switch, the parallel port would be your best choice. The matlab data acquisition toolbox has support for parallel port operations.

A quick web search turned up several other options. Here is one that describes one of the harder techniques:

http://www.dsprelated.com/groups/matlab/show/2929.php

At your own risk, you may be able to find someone who has already done this and posted the DLL.

CV

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MATLAB to control the serial port voltage

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