Quoth Hal Murray at 2008-05-21 06:06... > My standard setup for debugging RS-232 cabling is one of those gizmos with a > handful of LEDs. They are green for one polarity and red for the other. > Mine is actually a 25 pin version so it lives with a pair of 25-9 adapters. > I use it with a straight-through cable (extension cord) to position it out > where I can see it. > > Connect it to one side. Look at the lights. Then disconnect it from that > side and connect it to the other side. Different LEDs should light up. If > they overlap, you have troubles. If both sides light TD or RD, you need a > null-modem type cable. (or to remove the one you are already using)
A good breakout box is an essential tool for anyone working with serial links. (At least I think so!) My old 'Interfaker' has both male and female DB25 connectors on either side and a switch for each line. The switches mean that any line can be broken and re-patched using rows of 0.1" sockets and little patch leads. Typical use is when you need to reverse RXD and TXD - just flick the switches off for those lines and hook in the patch cables. I started using these beasties back in the days when I was running a load of Wyse terminals off an IBM6150 (RT/PC in the USA). That's before I ever SAW a Pee-Cee; oh happy days... Thing is, even in this day of serial to USB adapters, I wouldn't let anyone take my old Interfaker away! Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
