another possibility with python: https://code.google.com/p/modbus-tk/ (work with serial and ethernet modbus protocol, very handy)
for serial, the adaptor I use mostly : http://sigma-shop.com/product/68/usb-to-rs485-ftdi-interface-board-pcb.html work with my specific hardware @500kbauds, up to 10 devices on the bus, without troubles. I have done already some hal module that make remote action from Gcode command, I may look back for an example if you want. for serial communication, a good trick is to add a weak polarisation of the bus, like this http://saphum.com/content/rs485-line-polarization (I use 390 ohms), soldered on the back of adaptor. I end up making my how board for USB/RS485, that include these resistor (no galvanic insulation yet, as I don't have trouble, this may comes latter!) Claude Le 18.12.2014 17:13, Carsten Presser a écrit : > I am using this python lib: > https://pypi.python.org/pypi/MinimalModbus/0.6 > together with this adapter: > www.ebay.de/itm/111326580742 > > Its not FTDI, but the drivers are also in the linux-kernel. No need to > compile or patch anything. > > The Software is just a few lines in python to interface it with HAL. > > > > Am 18.12.2014 um 12:53 schrieb 77dab: >> Hi all, >> I have on my hand some mitsubishi VFD with 550w winches. >> I would like to try to move them using LinuxCNC. >> the thing is not meant to be Real time, and I've read the modbus module >> lives in User space and it's not RT. >> So, my question: >> Since it isn't RT, can I drive the rs485 thru a USB->rs485 converter, >> using a laptop? >> >> Thanks, Davide. >> ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
