RS232 Control LED without MCU

[Help]

Hi,

Is it possible without MCU directly using RS232 to control some output device?

At this moment i just only need to control one LED and one Buzzer.
I just need to control 2 output signal. So, hope can design a very simple and no costly design and i just only have serial port TXD and RXD pin only.
I had seen other people did before, they had using MAX232 as a driver to control 2 output but i'm not sure whether their thing is work fine not.

Thank you.

[Ret12_12]

Hi,

Tx pin is for transmite data or to set hi or low, so the first output is this,
The Rx pin is to receive dataand i don't remember if you can use it as an input, but
Pin 7 RTS it is also an output so you have the second output and another one is the pin 4 DTR also for output,
From the sample i had read on a book you can connect direct one led from DTR to the GND easy.

[fuflogen]

it's simply, look at internet, for example I used this: http://www.builder.cz/art/delphi/serialout6.html
but when I tried to control relay without diod I've damaged DTR output pin
so be carefull

[eugen]

In Elektor September 2000 - March 2001 they explain how to use the serial port

[Ret12_12]

for this reason you can use optotransistor