so if you jumper txd and rxd you can loopback your data ? if so the "drivers" are just fine.
time to grab a scope and troubleshoot On 5/22/2016 4:33 PM, Shaurabh Kumar Singh wrote: > Sorry for saying the USB end on my previous post. > > On Sun, May 22, 2016 at 7:32 PM, Shaurabh Kumar Singh > <[email protected] <mailto:[email protected]>> wrote: > > The RS232 that I am talking about is a BeagleBone Black RS-232 > Serial Micro-cape. It is indeed designed specifically for BBB. > > On Sun, May 22, 2016 at 7:26 PM, evilwulfie <[email protected] > <mailto:[email protected]>> wrote: > > 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. >> >> >> 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. >> 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 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/0a14b26f-3f0d-6be6-01ee-2e60b08d237d%40gmail.com > > <https://groups.google.com/d/msgid/beagleboard/0a14b26f-3f0d-6be6-01ee-2e60b08d237d%40gmail.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-rEGyuhHVyU_tQQp4kP7xe47EMLcQYQdOP3u48E_wAVdy1Q%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CAEh-rEGyuhHVyU_tQQp4kP7xe47EMLcQYQdOP3u48E_wAVdy1Q%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/55f3216e-05df-0be6-03ef-9216ab642581%40gmail.com. For more options, visit https://groups.google.com/d/optout.
