Modbus-RTU control of a MOLLUM VFD

I got a Mollum VFD .  This is one of the smallest VFDs on the market.  Nice when trying to pack everything in a box.  I think it is the same as the BD600 series  that StepperOnline sells.  Box is the same size, and the manuals look identical.  

I'm attaching the HAL file I created to allow LinuxCNC to talk to it.  
   


My custom_postgui.hal contains,

#set up the spindle monitor with pyvcp
loadrt scale names=scale_torque,scale_power,scale_current,scale_bus_voltage,scale_freq
addf scale_torque servo-thread
addf scale_power servo-thread
addf scale_current servo-thread
addf scale_freq servo-thread

setp scale_torque.gain .01
net torque_scale scale_torque.in mb2hal.torque.torque.float
net torque scale_torque.out => pyvcp.torque

setp scale_power.gain .1
net power_scale scale_power.in mb2hal.power.power.float
net power scale_power.out => pyvcp.motor_power

setp scale_current.gain .01
net current_scale scale_current.in mb2hal.current.current.float
net current scale_current.out => pyvcp.current

#voltage doesn't need scaling
net voltage  mb2hal.voltage.voltage.float => pyvcp.voltage

setp scale_bus_voltage.gain .1
net bus_voltage_scale scale_bus_voltage.in mb2hal.bus_voltage.bus_voltage.float
#net bus_voltage scale_bus_voltage.out => pyvcp.bus_voltage

setp scale_freq.gain .1
net freq_scale scale_freq.in mb2hal.freq.freq.float
#net freq scale_freq.out => pyvcp.freq

#fault messages don't need scaling
net vfd_fault mb2hal.fault.fault.int => pyvcp.fault

 

I’m looking for some guidance.

I’m using a similar VFD (Model G75). Are you able to control the spindle, or are you only able to monitor the parameters?

For some reason, I’m not able to get LinuxCNC to connect to this VFD. However, I was able to connect using Modbus Poll and successfully read some registers. I did this to confirm that my wiring and communication setup are correct.

Any suggestions would be appreciated.