Sam,
apology accepted.
Thank you.
...keyboard extension that is one to one, but RS232 is a whole another issue requiring knowledge of what each end (data set and terminal/computer) requires for signals.
I agree that RS232, as a protocol, is specified as regards which pins perform what specific functions. However, every standard 9-pin RS232/RS232C/modem cable/keyboard extension cable have all 9 wires connected straight through, end-to-end.
Again, it's the RS232 protocol that states which wires are used for what purpose. The wire itself is always a straight through connection on all 9 pins.
All of the above cables may be used interchangeably for any of their intended functions. The one cable that is different although it looks the same is the null modem cable, which crosses receive and send.
Rather than possibly confuse those reader of my book with unnecessary technical specifications, I simply applied generic names for cables that are readily available for purchase, under those names.
However, this does run the risk of causing more technically astute readers, such as yourself, to perhaps read too much into my writing. ![](https://ogrforum.ogaugerr.com/static/images/graemlins/icon_smile.gif)