huanyang vfd & linuxcnc 2.7

have you set up your vfd correctly?

PD001 = 2 (run commands to comm port)
PD002 = 2 (operating freq to comm port)
PD163 = 1 (slave address 1)
PD164 = 1 (baud rate to 9600 b/s)
PD165 = 3 (8N1 for RTU mode)

you can pick what you want for pd164 and pd165, just make sure they match what is specified in custom.hal

It is helpful to setup a loopback, and using a terminal program, make sure the rs485 is working.
I had to verify my stuff on a scope to make sure which wire was + and what was -. also I had to leave off the 120 ohm resistors, the waveform became unreadable with them installed.


once that side of everything is working, it's just a matter of making sure all the vfd settings match what the parameters for custom.hal

you can run hy-vfd in a terminal to see all the command line options.

I have been set the parameters correctly to the vfd and code
but the output is: RTAPI error can't access shared memory and then segfault.

vre wrote: I have been set the parameters correctly to the vfd and code
but the output is: RTAPI error can't access shared memory and then segfault.

Is RTAI running?
You need to start an RTAI session first:

halrun
loadrt hy_vfd

if that doesnt work read this

wiki.linuxcnc.org/cgi-bin/wiki.pl?LockedMemory