I was watching a video on YouTube where a USB RS485 device was used to control a VFD spindle. I was wondering if it is possible to do this using the RS485 port on the Mesa 7i96 instead of having to use an extra USB device.
Here is the code that was used to access the USB device. Is it even possible to do this with the Mesa 7i96? If so what would I change?
net spindle-cmd-rpm-abs => vfd.speed-command
net spindle-cw motion.spindle-forward =. vfd.spindle-forward
net spindle-ccw motion.spindle-reverse => vfd.spindle-reverse
net on motion.spindle-on => vfd.spindle-on
In several FAQ plenty oft people asking to connect
Mesa cards via the rs422 to a vfd. Wouldn't it be possible to add a second rs 485 in future releases oft the cards?
strahlensauger wrote: In several FAQ plenty oft people asking to connect
Mesa cards via the rs422 to a vfd. Wouldn't it be possible to add a second rs 485 in future releases oft the cards?
The physical connection is not really the problem, it is getting the right data to the the FPGA.
I wonder if there is a way to make the Mesa UART appear in /dev as a serial port?
Its probably possible but I think a cleaner way would be to support a hal string type
so this can all be done by a generic hal protocol component connected to the hal pins
exported by the UART TX and RX modules. This avoids losing real time if its desired
(and even if modbus for example is not real time, there's no reason to add userland
uncertainly to transactions)
PCW wrote: Its probably possible but I think a cleaner way would be to support a hal string type
so this can all be done by a generic hal protocol component connected to the hal pins
exported by the UART TX and RX modules. This avoids losing real time if its desired
(and even if modbus for example is not real time, there's no reason to add userland
uncertainly to transactions)
Indeed. But that would require re-writing of all the existing VFD drivers, which currently hook in to /dev/ttyUSB0
