Hi, indeed i want to go for Modbus TCP, but unfortunately my ventilation system has only Modbus RTU. The BB will act as a Gateway between Modbus TCP and Serial Modbus RTU.
Am 30. November 2016 21:15:14 MEZ, schrieb William Hermans <yyrk...@gmail.com>: >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 a topic in the >Google Groups "BeagleBoard" group. >To unsubscribe from this topic, visit >https://groups.google.com/d/topic/beagleboard/kuEDsK_7YWE/unsubscribe. >To unsubscribe from this group and all its topics, 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. -- Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet. -- 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/76377B55-1666-4E2B-8A05-37C7515F3307%40owee.de. For more options, visit https://groups.google.com/d/optout.
