we had already told you you MUST use a 3.3v translator of your choosing.
On 5/22/2016 4:22 PM, Shaurabh Kumar Singh wrote: > @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] > <mailto:[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] > <mailto:[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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAEh-rEGhkEakpTL4Vi3aZHg5SgTJX6ou0re75_q5%3DhQrWbSFOA%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAEh-rEGhkEakpTL4Vi3aZHg5SgTJX6ou0re75_q5%3DhQrWbSFOA%40mail.gmail.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/0a14b26f-3f0d-6be6-01ee-2e60b08d237d%40gmail.com. For more options, visit https://groups.google.com/d/optout.
