Experimental Physics and
Industrial Control System

"Koennecke Mark \(PSI\) via Tech-talk" <tech-talk at aps.anl.gov> · Fri, 7 Feb 2020 10:33:30 +0000

Hi,

I am writing a motor driver for an old piece of french equipment called EuroMove. 
This is going well. But the thing does not implement homing in the controller. I try
to implement this in the asynAxis driver. To that purpose, I need the motor resolution. 
It is in principle there, in the MRES field of the motor record.  I tried:

pC_->getDoubleParm(axisNo_, pC_->motorResolution_, &resolution);

but this gave me a 0 instead of the .01 to which the MRES field had been configured in the 
motor substitutions file. I know the record sees this because the conversion for physical 
units to motor steps is working. 

I also tried motorEncoderRatio_ which returned infinity. 

My question now is how I can get at that information in an asynMotorAxis driver?

Or is my only option to write a configuration command or axis creation command which 
passes the resolution value in?

This is against base3.14.12 and motor6.9 on RHEL7 linux. 

Best Regards,

     Mark Koennecke

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System