On Fri, Apr 14, 2017 at 3:27 AM, <[email protected]> wrote: > Hi All, > > I hope someone can help me out there as I'm pulling my hair out in > frustration at trying to get a simple serial port write from my BBB using > Node-Red. > I have tried lots of different images to try and sort this problem out and > thought I'd try you guys to see if anyone has successfully got this > working?!?!?! > > Software: > My latest attempt is to use the recently released Debian BBB image > (https://beagleboard.org/latest-images) 8.7 [2017-3-19]... this has node red > baked in as standard.(Ver 0.15.2). > > Hardware: > I have a (RS485) waveshare cape fitted to my BBB to which is then connected > an FTDI RS485 to serial (USB) interface cable - so to test comms I should be > able to write a simple flow that uses an injection node into a serial output > node and the message should go through the RS485 cape into the RS485 cable > where it is converted into serial and back into my computer where it appears > as a serial message in a terminau program (Terra Term).
sorry i don't have that cape, but i'd expect that to work, just placed an order for one.. > > When I click on the serial node I can search for the available comm ports and > it allows me to select '/dev/ttySx' (where x is 0 to 5).... when I deploy the > node it say connected in the serial node status. When I inject a message > nothing is sent from the selected comm port. (Note - I have also tried an > injection from the USB serial port into the cape to see if I can get a > incomming message displayed in the debug window....but that doesn't work > either) > > I have read lots of comment online from people saying to adjust the uEnv.txt > file to include a cape structure..... but this didn't work in the past - now > with the latest build of Debian I can't seem to modify this file to try it as > it says permission denied when I try to save the modified file (is this > because I now have to login as Debian instead of Root - a recent change in > the latest image)??? you've always had to be root to open uEnv.txt, as debian run: sudo nano /boot/uEnv.txt > > In the past I have also tried OctalBoneScript node install instead of using > the standard Node-Red serial node, but this didn't work either Node-Red actually pulls in OctalBoneScript.. (ps, just a few days ago i syned in node-red 0.16.2) > I seem to be going round in circles with this a burning hours/days in the > process.... can anyone help please?? Regards, -- Robert Nelson https://rcn-ee.com/ -- 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/CAOCHtYgDrTqQmRPAoGsGwH0qXY4JooabaqbDS0Zf%2BU%3D9shG1nA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
