RS232 Expander


Posted on May 23, 2012

I got a problem with my notebook, because it has only COM1. My programmer board, Easy-Downloader must use serial port and the application board also needs to communicate via the same serial port. I do remembered I have to swap DB9 connector of both devices many times. So I spent 30 minutes built above simple hardware. Of course it was not the expander by meaning. But it helps me a lot. Someone may prefer to call it as the rs232 selector, but I like `expander`. Above picture is the sample board, no need to make a pcb.


RS232 Expander
Click here to download the full size of the above Circuit.




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