Sometimes I am a complete ditz. Yes, me. Friday I was having all sorts of problems with a cable for a box I was building. Now, today I wanted to make things go properly. That is use all the handshaking signals correctly on the RS-232. And I could not get the darn thing to work. Then I tested the cable I was working with last week. It was also now faulty. Hmm. Put it on the test bench. I am only seeing signals go one way. What is going on?

So I trace the signals out. Seems that the return signal does not go where it supposed to. Oops. Look at my wiring diagram. The wiring diagram says things are fine, but the cable does not line up. Neither of the cables line up. Blast. When I tidied up wiring friday night I must have mixed up two wires. And then I copied some of the wires. That would do it! More attention to detail required. Now I can finish building my little box. And it might actually work!

These sorts of cabling problems are a pain. So much time wasted on something which should have just worked. Too many things are like that unfortunately in this world!