On Fri, 20 May 2016 14:41:25 -0400, you wrote: >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.
I've reached the limits of my expertise on this platform. Someone else will have to answer the question. Harvey > >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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