Hello,
we have set up an MPG jog wheel on the encoder on our 7i96S' TB2 pins 7 - 11 which works really well except it sometimes "misses" 1 or 2 increments of a full rotation but other than that it's been a real pleasure to use after getting it set up...
Yesterday we wanted to add Modbus to read the spindle load from our VFD. So we got an Arduino and an RS485 transceiver board out, wrote a little sketch to read an analog input, tested it with a USB - RS485 adapter, worked beautifully, so far, so good.
Flashed the 7i96sd_pktv2.bin, compiled our own little mesa_modbus component reading one value, didn't get it to work at first, so we tried the 7i96sd_pkt.bin, didn't make much of a difference. So we got the scope out and eventually fixed several small mistakes including but not limited to slave address 0 instead of 1 and swapping A/B on the RS485 transceiver... maybe it was a little too
late in the night early in the morning for ambitious projects
One scale component and a little fiddling around in the HAL later and we got a working spindle load indicator.
So we home the machine and the machine starts jogging on its own. A peek into halshow tells us that the encoder count is rapidly decreasing and going into large negative numbers. At first I thought I fried something while doing late night wiring hack jobs but just by disabling our mesa_modbus component, the spook was gone and we could reliably jog the machine without any problems.
Going out on a few limbs here, could the mesa_modbus component somehow write into a memory region where the encoder stores info on its count?
P. S. Andy, thank you for your work on the mesa_modbus component! Surprisingly quick setup and much less of a pain than expected
We might write up a little tutorial once we got the whole thing working.
