I have this module:
My question pertains specifically to the RX and TX pins shown (sorry for having it upside down, only way I could make it look clear.)
I don't understand why there are 4 pins, for 2 signals. I would like to use this module to send information to my FPGA (DE0-nano), using an IP core that implements UART-RS232. However I do not know how to connect the two.
If some of those pins are ground, how do I know which ones? It is not labeled.
This thing was originally used to program a PIC through the computer, by the way.