Hi, I have almost the same situation. I have a Beaglebone Green and the Waveshare RS485 CAN CAPE mentioned in the first post. In the near future I want to use RS485 to build a Modbus TCP to Modbus RTU Gateway to communicate with a central ventilation system in my house.
What i found out so far is that the Waveshare cape can by default only receive or transmit, but not both because it has no way to switch the /RE and DE pins of the MAX485. But in my opinion the middle pin of the 485_RSE JMP Jumper header could be connected to a appropriate pin using a jumper wire. My problem at the moment is that i have no idea if the kernel shipped with the BeagleBone Green (3.8 something) is able to handle RS485, especially direction switching. I've read that I should use the omap-serial driver instead of the 8XXX-serial driver and that i have to apply some overlay stuff, but actually 'm completely lost. It would be very helpful if somebody could point out what steps i need to do in order to get RS485 working. On Friday, November 4, 2016 at 11:07:49 AM UTC+1, Firrel wrote: > > Hi Travis, > > I am trying to do the same thing as you. With the Waveshare RS485/CAN cape > make the CAN portion working. Could you please specify the steps you made > in order to make it working? Were you using the provided image from 2013 or > a clean new image? > > Best regards > Firrel > > Dňa nedeľa, 9. októbra 2016 3:30:23 UTC+2 Travis Lytle napísal(-a): >> >> I've use the dts from waveshare website and have used the can portion of >> the board with no issue. >> >> http://www.waveshare.com/wiki/RS485_CAN_CAPE >> >> >> >> On Friday, September 23, 2016 at 9:10:14 AM UTC-4, >> [email protected] wrote: >>> >>> Hi, >>> >>> I got this Beaglebone Black RS485 Cape from amazon >>> https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=BeagleBone+Black+CAPE+RS485&pldnSite=1 >>> >>> I'm new to Beaglebone Black and RS485 Cape. I didn't any source for the >>> communication between RS485 and BBB online. So I need help in software >>> module and and how to communicate using RS485 via BBB. In the end I want to >>> control Relay (3.3V / 5V) using RS485 Cape. >>> >> -- 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/0a22cdc5-8477-4fcb-ba65-22aa6cf51561%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
