Thanks everybody for your answers. Things are clearer now. On 19/12/2014 20:27, Todd Zuercher wrote: > For my setup it often takes a second or two for all the drives to respond to > the "start" command and send back the "I am starting but not up to speed yet" > signal to Linuxcnc. I was able to connect the VFDs state signal to a > image_u32 in pyvcp, to give a visual of the drives state, > (fault,fault-locked, start-pending, stopped, dc-braking, run-at-0hz, running > at speed, accelerating, decelerating, current-limiting, decel-override, and > lower trans. switching-on). Kind of gives you a warm feeling to see all > those brightly colored and labeled boxs blinking, changing colors, and words > when the motors turn on/off. > > ----- Original Message ----- > From: "77dab" <77...@tiscali.it> > To: emc-users@lists.sourceforge.net > Sent: Friday, December 19, 2014 4:19:06 AM > Subject: Re: [Emc-users] Modbus > > Yes, I know, I already made a Java software to control independently 8 > of those VFD via modbus, and it works. They can run up to 38600baud. > what timing do you think i can expect from a sistem like that in > LinuxCNC? something like 10 VFD messages per second? or better? > > On 18/12/2014 14:57, Todd Zuercher wrote: >> I am controling 8 VFDs on a single machine with Linuxchc through one >> USB-RS485 converter (from Automation direct). No real problems for me >> except some random com errors. It works good enough though. I have not had >> to restart or anything like that because of them. They do fill up an error >> log pretty fast when running from terminal. It can be a little slow to >> respond sometimes, reading and writing to 32 different registers at 9600bps >> plus rewrites for bad com. >> >> It can be a little tricky to set up, you have to know all the modbus details >> about your drives (every manufacturers drives are different), and configure >> mb2hal to use them (there is nothing automagic here). >> >> ----- Original Message ----- >> From: "77dab" <77...@tiscali.it> >> To: Emc-users@lists.sourceforge.net >> Sent: Thursday, December 18, 2014 6:53:40 AM >> Subject: [Emc-users] Modbus >> >> 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 >> >> ------------------------------------------------------------------------------ >> 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 >> > > ------------------------------------------------------------------------------ > 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 > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! 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