Problem with DTR(20) ....serial port pic programmer.

Hello

I want to build this circuit:

http://hyvatti.iki.fi/~jaakko/pic/jdm84ne3.png

It`s a pic programmer that is connected to the serial port. And this is also the problem that I have. I don`t know where to connect the DTR(20) wire . I mean the serial port has only 9 connectors. 20 is only possible at the parallel port, or the number indicates something else.

Any suggestions?

Greetings Charon102

It refers to the 25 pin version of the serial port. If you are using the 9 pin version, you will need to connect to the equivalent pin. Here is a cross reference:

https://www.aggsoft.com/rs232-pinout-cable/pinout-and-signal.htm

Thanks zevon8, that was very helpful. I didn`t know that there are two diffrent types of serial ports avaliable.