On Thu, 16 Apr 2015 23:33:14 -0700 (PDT), you wrote: >Oh, Lord.. I wasted one whole day trying to figure this out. Turns out I >connected Rx to Rx and Tx to Tx.
Find an RS-232 LED monitor. You want something that monitors the state of each line, and shows you a red or green light depending on the state of the line. I have seen them in 25 pin versions, but you'd likely want a 9 pin version. Connecting that up to each device in turn shows you which line is drive, and which is not. There's DTE (Data Terminal Equipment) and DCE (Data Communications Equipment) (IIRC), they have different signals on different pins, since the original idea was that they'd be able to be wired pin to pin to function. DTE was supposed to be a terminal of some sort, DCE was the external modem. Now that your computer could be both, there's a connection problem. Been there, done that. Harvey >Thank you, Dale Schaafsma. > >On Wednesday, September 11, 2013 at 11:33:36 PM UTC+5:30, Dale Schaafsma >wrote: >> >> You need to connect to J1, not P9...see the SRM (System Reference Manual) >> at >> http://circuitco.com/support/index.php?title=BeagleBoneBlack#Hardware_Files >> Make sure cable's RX is connected to BBB's TX and cable's TX is connected >> to BBB's RX. >> -Dale >> >> On Tuesday, September 10, 2013 11:10:54 PM UTC-5, cerry wang wrote: >>> >>> >>> I'm new in beaglebone black. I know in original version beaglebone, I can >>> get serial debug information just plugging mini usb to pc. But Beaglebone >>> black can't. I search from >>> http://circuitco.com/support/index.php?title=BeagleBone_Black_Accessories >>> and try to use Adafruit 4 Pin Cable (PL2303) by plugging green line to >>> P9-4, white line to P9-5, black line to GND. I use putty trying to get >>> serial information but I can get only much of disorder and non-meaningful >>> characters just like setting wrong baud-rate. But I don't know why I set >>> 115200 in putty and it work in original version beaglebone. How can I get >>> right serial debug information in Beaglebone Black. Thanks. >>> >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
