RS232 to invert TTL converter - Electronic Circuits Projects Diagrams Free

hani_a · 23rd April 2004, 10:44 PM

I'm using ATMEGA16. It provides me with code to transmit and receive data via the USART. I've been looking for an RS232 to invert TTL conversion device on the internet and I can't find anything.

Thanks!
Hani A.

Exo · 23rd April 2004, 10:47 PM

do a google search for MAX232

Nek · 25th April 2004, 07:09 PM

You can also use the LT1181 which I have used successfully.

tom_electronic · 28th April 2004, 03:48 PM

hi
You can use every RS232 IC for example max 232 or ICL 132 &ICL 233
from HARRIS semiconductore
BUT i have a happy suggestion
test THis circut Its very chep and work very well
[img]

Matt(Pic progger) · 30th April 2004, 10:36 AM

:idea:

For my serial work on PICs (i know you are using an atmel, but it may help others...) I just use a 10k resistor to the RX pin (on the PIC) and connect the TX (from the PIC) straight to the PC.

The catch.... you can't use the UART, the rs232 data is now "inverted", all the max232 ic's etc invert the data for use with the PIC UART...

It works a treat, i have used this reliably (over standard cable lengths) to 115200 at 8mhz

Let me know if anyone wants the code for the serial tx/rx!

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23rd April 2004, 10:44 PM	(permalink)
hani_a	RS232 to invert TTL converter I'm using ATMEGA16. It provides me with code to transmit and receive data via the USART. I've been looking for an RS232 to invert TTL conversion device on the internet and I can't find anything. Thanks! Hani A. __________________ i\'m actually a novice in the robotics field and would love to get help to lunch my projects..

23rd April 2004, 10:47 PM	(permalink)
Exo	do a google search for MAX232

25th April 2004, 07:09 PM	(permalink)
Nek	You can also use the LT1181 which I have used successfully.

30th April 2004, 10:36 AM	(permalink)
Matt(Pic progger)	:idea: For my serial work on PICs (i know you are using an atmel, but it may help others...) I just use a 10k resistor to the RX pin (on the PIC) and connect the TX (from the PIC) straight to the PC. The catch.... you can't use the UART, the rs232 data is now "inverted", all the max232 ic's etc invert the data for use with the PIC UART... It works a treat, i have used this reliably (over standard cable lengths) to 115200 at 8mhz Let me know if anyone wants the code for the serial tx/rx! __________________ Regards MATT!