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

[Charon102]

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

 

[zevon8]

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

 

[Charon102]

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