The RX and TX at the beaglebone are working just fine. The TX output from the RS-232 is 5V. Also i tried with and without connecting the red wire(5V) from the RS 232. The necessary connections are GND (black wire) , RX and TX(green and white wires) of the PL2303 USB to Serial adapter. I also tried using a BeagleBone Black RS-232 Serial Micro-cape (see http://www.logicsupply.com/cbb-ttl-232/).
Note: RX and TX are working just fine for all the UART ports.(i confirm after every try) On Fri, May 20, 2016 at 10:32 AM, evilwulfie <evilwul...@gmail.com> wrote: > if he connected it to the cnc with no 3.3v adapter it also could have > fried the bbb. > > > > > > On 5/20/2016 7:08 AM, Wally Bkg wrote: > > > You do realize that on your PC the RS232 signal levels from the COM ports > are +/- 12V while without extra hardware the Beaglebone levels are 0-3.3V? > You may have fried the RX input on the Beaglebone if you've connected it > directly to a +/- 12V RS232 TX output. > > Assuming you've got the logic levels right, If you used a "standard" > serial cable on your PC to the CNC machine it probably activated the CTS or > DTR automatically, you may need to run one more wire from the Beaglebone, > or tie it active on the CNC interface side. > > > On Friday, May 20, 2016 at 7:36:15 AM UTC-5, Shaurabh Kumar Singh wrote: >> >> The cnc is dte as far as I know. >> And I am assuming since it worked without hardware handshaking on my pc, >> it shouldn require the same for the bbb either. >> That said, I have tried both the settings. With and without hardware >> handshaking. >> The only thing I can think of is for some reason perhaps, the default >> serial port settings must be different on the bbb (with debian) than my pc >> (where I previously successfully had communicated-windows) >> On 20 May 2016 08:19, "Wally Bkg" <wb666...@gmail.com> wrote: >> >>> On Thursday, May 19, 2016 at 7:08:55 PM UTC-5, Shaurabh Kumar Singh >>> wrote: >>> >>>> Okay. I shall look it up. >>>> By the way, i did confirm the working of the UART pins(UART1 RX to >>>> UART4 TX and vice versa). >>>> I had two terminal tabs open and when i typed into one and >>>> entered(UART1 settings) it showed up on the other terminal with UART4 >>>> settings. I inferred that the Adafruit libraries work just fine for the BBB >>>> (correct me if i am mistaken) >>>> >>>> It is just that while interacting with a CNC machine(with a HAAS OS) it >>>> is not communicating rather just showing up what is being sent. >>>> >>> >>> You may need CTS or DTR active for the other end to accept data and >>> respond. Are you sure the CNC machine doesn't need a "hardware >>> handshaking" protocol? >>> >>> If you have uart1 talking to uart4 on the Beaglebone, that says the >>> problem is the physical connection and/or the protocol to the CNC machine. >>> Is the CNC machine wired to be DTE or DCE? >>> >>> At this point I think you need help from the CNC machine's >>> documentation, or from someone familiar with that particular machine. >>> >>> -- >>> 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> >>> https://groups.google.com/d/topic/beagleboard/Z1s_NwXYNrw/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> beagleboard...@googlegroups.com. >>> To view this discussion on the web visit >>> <https://groups.google.com/d/msgid/beagleboard/3b9db8f5-b454-4801-b4a5-49a867c0e255%40googlegroups.com?utm_medium=email&utm_source=footer> >>> https://groups.google.com/d/ >>> msgid/beagleboard/3b9db8f5-b454-4801-b4a5-49a867c0e255% >>> 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 beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > <https://groups.google.com/d/msgid/beagleboard/30ad5a80-4c6b-453b-b74b-c63f010996c4%40googlegroups.com?utm_medium=email&utm_source=footer> > https://groups.google.com/d/msgid/beagleboard/30ad5a80-4c6b-453b-b74b-c63f010996c4%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 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 > beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/0eb51074-b51a-f658-f69c-10a7ec8aa58b%40gmail.com > <https://groups.google.com/d/msgid/beagleboard/0eb51074-b51a-f658-f69c-10a7ec8aa58b%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. 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