On Saturday 02 March 2019 17:47:26 Thaddeus Waldner wrote: > I get 24v on one wire, zero on all of the rest.
Thats not a legal voltage on any pin of an rs485 connection. Some marketing dweeb is playing fast and loose with the jargon IMO. Its (rs485) a balanced differential signal where one wire is compared to the other to determine the logic state. Because most noise is longitudinal, meaning its identical on both wires, comparing two noisy wires is a good way to get extreme noise immunity. I haven't personally used the circuit for that, but I made the mistake of buying an encoder with differential outputs on 6 wires. Feeding that encoder a/b to a pair of diff to ttl gismo's sold as an rs485 interface you can get for about a dollar a copy on ebay, I made perfect ttl signals out of that encoder at close to a 100 kilohertz. fed as single ended to an encoder in a mesa 5i25, linuxcnc loved it. I think that it was intended to run on 12 volts, but its happy as a clam on 5 volts and has been for a year now. The actual signal wires are sitting at about 2 volts, have about a 200 mv signal on each wire from the omron encoder. I had to wire them up as one way, though they can be full duplex on those 2 wires. Someone else with wider experience than I might be able to help. All my experience with vfd's has been with direct controls, not all of which has worked. > > Thaddeus Waldner > Newdale School > Elkton, SD 57026 > > ________________________________ > From: Gene Heskett <[email protected]> > Sent: Saturday, March 2, 2019 8:48 AM > To: [email protected] > Subject: Re: [Emc-users] VFS-11 modbus driver > > On Saturday 02 March 2019 08:31:57 Thaddeus Waldner wrote: > > I purchased a usb RS485 port that looks similar to the one you have. > > I have the VF-s11 driver successfully loading and exposing its HAL > > pins. The HAL pins are connected and are switching with my spindle > > start-stop commands. I have also set the baud rate, parity, number > > of bits, stop bits, and target where applicable in both the .ini > > file and on the inverter panel. > > > > And I get nothing. > > > > I wonder if i’m not missing something. I do have an actual VF-S9 > > instead of the VF-s11, but the VF-s11 documentation states that the > > I/O should mostly match. > > > > I suspect that maybe I am using the wrong pair of wires on the RJ45 > > connector. I couldn’t find any Toshiba documentation on that so I > > just used what appears to be a standard for RS485 half-duplex on > > that connector; the blue = A and the blue-white = B. > > First, find a ground on the vfd, then you should see a low voltage, > maybe 2 volts or thereabouts on the active wires used. The other 6 s/b > millivolts or less. you may have to interchange them to get the > correct polarity. Whoever thought useing an rj45 for a 2 wire circuit > ought to be fixed so he can't make any more such mistakes. Sure its > cheap, and dependable but theres also 7!=49 ways to screw it up! > > > The manual indicates that the inverter is always listening for > > serial communication, and that sending the inverter enable signal > > automatically cedes control from the inverter panel to serial. For > > this reason I assume that I don’t need to enable serial > > communication on the inverter in order for it to work. > > > > Thaddeus Waldner > > ________________________________ > > From: andy pugh <[email protected]> > > Sent: Tuesday, January 29, 2019 4:07 AM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] VFS-11 modbus driver > > > > On Tue, 29 Jan 2019 at 01:39, Thaddeus Waldner <[email protected]> > > wrote: > > > > As I understand it, I need a RS485 port. Is it reasonably possible > > to add a > > > > > second serial port on some of the unused I/O pins to the MESA > > > card? Would I be better served buying a usb-RS485 adapter? > > > > The vfs11 driver runs in user-space so the fact that you can't have > > realtime control through USB is not such a problem. This means that > > a cheap USB-RS485 dongle probably is as good a way to do it as any. > > This is how I connected my VFD. > > https://forum.linuxcnc.org/forum/18-computer/30675-on-motherboard-mo > >db us-rs485-connection > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
