https://store.chipkin.com/articles/rs232-how-can-i-do-serial-port-sniffing-snooping-through-rs232
Assemble the cable.
You need three conductor cables and three 9-pin d-type connectors. We suggest you put a male on one end and a female on the other end and do not cross pins 2 and 3 over. That way you have a cable segment that will extend any cable without requiring gender changes or worrying about 2-3 cross over. Put a female connector on the snoop end so it connects to your PC port without a gender change.
The diode part number is 1N4148. The black band on a diode is the cathode end and corresponds to the vertical bar in the schematic of a diode.
A diagram is provided below the text of this article.
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