Okay from what you said I guess it could be a drivers issue. The rest of it i have tried. What do you suggest if it is a driver problem?which driver and how do i install the drivers? could you perhaps tel me where to look exactly.
Thank you On Fri, May 20, 2016 at 1:12 PM, Harvey White <[email protected]> wrote: > rOn Fri, 20 May 2016 11:55:28 -0400, you wrote: > > >Exactly. I did what you just said. Used the ground RXD TXD. And the > >examples shown online do not use the red wire(power line) at all. And that > >is exactly what i did. I went by the conventional method before starting > to > >try out other things. also i later used the 3.3 V jumper. > >Do you have any suggestions on what i could perhaps try? > > If you have the 3.3 volt jumper enabled, then that will protect your > processor from overvoltage. > > Now I'd ask if you have RXD and TXD reversed (regardless of how the > software works, unless it can do that). Check the pins with a logic > probe, or a scope to see that the TXD is connected to the proper RXD > line. > > If you have the right signals on the right lines, it's going to be > either a hardware configuration problem (in terms of what the software > is set to do) or a software problem (no drivers). > > I'd also write a small routine to output characters from one to the > other to see what's going on, just test signals. > > Check the destination to see what lines are active other than TXD and > RXD, you may need to duplicate them. > > > Note that an RS232 line level input and output are at least +/- 6 > volts. > > From a computer to the BBB is likely to be USB to 3.3 volts, and the > output from the BBB to the RS-232 level converter is likely to need 5 > volts unless it is specified to be 3.3. It is likely that the BBB > cannot properly drive the RS-232 converter unless the converter can > tolerate that. > > The input from the 5 volt RS232 converter is going to be 5 volts, > which cannot be connected to the BBB directly, it needs to go through > a level converter. > > the BBB is a 3.3 volt world. > > Harvey > > > >Thanks > > > >On Fri, May 20, 2016 at 11:49 AM, Harvey White <[email protected]> > >wrote: > > > >> On Fri, 20 May 2016 11:11:39 -0400, you wrote: > >> > >> >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) > >> > >> Even though you check after each try, putting a signal over 3.3 volts > >> on the BBB pins (or 1.8 volts on the analog pins) is just asking for > >> trouble. > >> > >> Good engineering says not to put too much voltage on processor pins. > >> > >> 5 volts on a 3.3 volt maximum pin is too much. You may or may not > >> have overstressed the pins, which may or may not fail sooner or later. > >> > >> If you are in college, and you have not been told this, then you need > >> to speak to your professors. Data sheet maximum ratings are not > >> suggestions. > >> > >> You need the ground and the RXD and TXD lines. The maximum voltage on > >> the RXD and TXD lines should be 3.3 volts, on the average adaptor, > >> there's a jumper for that. There's also a jumper to select a 5 volt > >> swing. You do not need either the 3.3 volt power line or the 5 volt > >> power line. > >> > >> Harvey > >> > >> > >> > >> > > >> >On Fri, May 20, 2016 at 10:32 AM, evilwulfie <[email protected]> > >> 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" <[email protected]> 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 > >> >>>> [email protected]. > >> >>>> 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 [email protected]. > >> >> 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 > >> >> [email protected]. > >> >> 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 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/ggbujb1tgbnopo5bgh2i32hu8ekd8l356c%404ax.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]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/7pgujb1en66bk8hgi520jgs9u101lomhbc%404ax.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. 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