rs232 to ttl converter without using external power supply

[fireplus]

Hi,
Any body have any idea about that :
can i use DTR , RTS to get the power for the converter circuit (TX , RX)

Thanks for any body wants to help

Fire in the Wire :idea:

 

[IanP]

Re: rs232 to ttl converter without using external power supp

Here you will find several simple options:
"TTL to/from RS232 Signal Conversion"
http://www.piclist.com/techref/io/serial/ttl-rs232.htm

Regards,
IanP

 

[fireplus]

Re: rs232 to ttl converter without using external power supp

all of them use external power supply
thanks for you efforts

any body have a solution ?

Fire in the Wire :idea:

 

[IanP]

Re: rs232 to ttl converter without using external power supp

Below is an example on how to take power from the RS-232 port ..
This circuit was delivered in my previous post, as well as other ciruits with trasistor-based level converters ..
They only require a little bit of effort to combine them into one working circuit .. that's all ..

Regards,
IanP