On Wed, Nov 30, 2016 at 11:45 AM, Bouni <bo...@owee.de> wrote: > 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. > > We bought a Logicsupply RS485 / CAN cape for a similar purpose. The CAN device we were trying to communicate with was actually a Schneider AC inverter, using a proprietary CANBUS protocol called "Xanbus"( Originally Xantrex ).
Anyway, for your case, I'm wondering why you need RS485 / Modbus at all. Considering the beaglebone has an ethernet port . . .I mean, you're probably going to want to use Cat5e, or Cat6 anyway, right ? -- 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/CALHSORqgRgUOqaPcOj%3DJ-4akOG2co35d-GGqB%2B4btLYuQNLM%3Dw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
