Earl, Yes. My zip file with the Python code and xml for the pyvcp_options are now here: http://www.autoartisans.com/CAN/LinuxCANopen.zip I was suggesting CAN bus only because I've been using it since 1992 and so for me it's pretty easy. But the example was more to show how you can send commands through a serial port to a device. If it's a CANUSB then the serial information is formatted to create CAN message. If it's MODBUS the information is formatted to create MODBUS messages.
Here's an example of Arduino code for Modbus. https://docs.arduino.cc/learn/communication/modbus This is one of the things I found searching LinuxCNC and MODBUS. https://linuxcnc.org/docs/html/drivers/mb2hal.html It likely should be pretty easy in LinuxCNC. In MACH3 it was almost trivial to talk to MODBUS devices. John > -----Original Message----- > From: Earl Weaver [mailto:weaverst...@frontier.com] > Sent: August 22, 2023 1:34 PM > To: John Dammeyer; emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Reverse Pulse Control on Dust Collectors > > > John, > So if I understand you correctly, you are suggesting using > LinuxCNC computer to communicate via CANBUS or MODBUS > long distance remotely with the dust collectors? > > The way I have it set up is: The dust collectors are suspended from the > ceiling, > but I have all the solenoid wires coming to a central location > electrical panel > that also holds the VFD's for starting and stopping the motors. > I run the VFD's at half speed while doing the reverse pulse. > So all the pulse control can be at the central electrical panel. > > -Earl > > On 8/22/2023 11:59 AM, John Dammeyer wrote: > > Earl, > > I tried to send this to the list but both the xml and zip files resulted in > > black listed attachment messages. > > John. > > > > Although I haven't touched this for almost 2 years and only tested on Pi4 > > LinuxCNC on the benchtop one approach to dealing with external hardware > is > > CAN bus using the CANopen protocol. Attached is my source code for that. > > Eventually I will do a far more extensive write-up on how to interface to > > CAN bus and LinuxCNC. Especially using a Pi with a CAN Hat instead of the > > serial port and the LAWICEL CANUSB dongle. > > > > Alternatively there are examples out there for MODBUS and I'm sure you > can > > find Arduino code that makes an Arduino a MODBUS module. > > > > John Dammeyer > > > >> -----Original Message----- > >> From: Earl Weaver [mailto:weaverst...@frontier.com] > >> Sent: August 22, 2023 8:41 AM > >> To: emc-users@lists.sourceforge.net > >> Subject: [Emc-users] Reverse Pulse Control on Dust Collectors > >> > >> Hi everyone, > >> > >> Does anyone have suggestions what would be a good option > >> for reverse pulse control on my dust collectors? > >> > >> I have 3 separate dust collectors that use (two each) air solenoid valves > >> to give the filters an alternating 100 millisecond (1/10 second) pulse > >> to remove the dust from the filters. > >> I have solid state switch relays (triac) to pulse the 120 volt AC > >> solenoid valves. > >> > >> I already have this setup on my LinuxCNC Plasma cutter and have it > >> working with ClassicLadder in LinuxCNC. > >> It seems somewhat overkill to use a full LinuxCNC setup to control these > >> other three dust collectors. > >> > >> Would a micro-controller like Arduino be a better solution? > >> I have no experience with Arduino. > >> > >> What about a PLC? > >> > >> Any input, or suggestions? > >> > >> Thanks, > >> Earl > >> -- > >> > >> > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
