@Bruce I should have mentioned it earlier. Anyway, it is a null modem cable (DB 25 male to DB 9 female). I have tried every permutation and combination between the TxDs' and RxDs' . I am not using any adapter at the BBB. I am simply making wired connections. From the RS 232 USB end I have four wires (red,green,white,black) of which i am connecting green white and black as suggested and shown in examples available online. I had previously asked if i should instead use an FTDI USB to serial adapter designed for BBBs. Also, a possibility is, as discussed earlier, the BBB might be lacking necessary drivers.
On Sun, May 22, 2016 at 1:47 PM, Bruce Boyes <[email protected]> wrote: > If you used a straight through serial cable from your PC to the CNC then > the CNC is likely DCE, since the PC serial is usually DTE. If you used a > null modem cable then the CNC could be DTE. You didn't specify which cable > you used. > > DCE is Data Communication Equipment and originally was a device like a > modem, not a Terminal or PC. DTE, the Data Terminal Equipment was "in > charge" and could control peripherals like serial modems or printers. > > A modem or DCE device generally just waits there to be told what to do. > DTE connects to DCE with a "standard" cable which is just straight through > since the hardware DCE and DTE ports themselves are wired such that the TXD > from DTE connects to the RXD of DCE and vice versa. To connect DTE to DTE > or DCE to DCE you need a "null modem" cable which swaps those pins in the > cable, otherwise you have both TXD connected to each other = won't work. > > What UART adapter are you using on BBB? Did I miss that information? > Apologies if I just added to the confusion. > > Bruce > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/Z1s_NwXYNrw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/41fdcae3-e966-415c-bb07-156662743ee5%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/41fdcae3-e966-415c-bb07-156662743ee5%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAEh-rEGhkEakpTL4Vi3aZHg5SgTJX6ou0re75_q5%3DhQrWbSFOA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
