Re: read RVB and VAL don't match when moving smarAct motors without encoders

[Juliane Reinhardt via Tech-talk <tech-talk at aps.anl.gov>]

    Hi Kevin,
    
    smarAct does not support the EPICS driver, they did however mention
    the community-developed drivers that can be found on github. I had a
    look into this one:
https://github.com/epics-motor/motorSmarAct/blob/master/smarActApp/src/smarActMCS2MotorDriver.cpp
    and found the variable theoryPosition that reads :CHAN%d:POS:TARG
      
      Is that the required command to query a motor without an encoder?
      Then I could try to build a new IOC based on this package.
      
      Thanks,
      Juliane

On 11/12/20 15:27, Kevin Peterson wrote:

> The
>       controller is returning an error for both of the position query
>       commands used by the driver:
>       
>       
>       2020/11/12 15:11:03.905 192.168.168.200:5000 write 5\
>       
>       :GP1\\n\
>       
>       2020/11/12 15:11:03.908 192.168.168.200:5000 read 8\
>       
>       :E1,129\\n\
>       
>       
>       2020/11/12 15:11:03.912 192.168.168.200:5000 write 5\
>       
>       :GA1\\n\
>       
>       2020/11/12 15:11:03.915 192.168.168.200:5000 read 8\
>       
>       :E1,129\\n\
>       
>       
>       The sensor type that is returned is 1:
>       
>       
>       :GST1\\n\
>       
>       2020/11/12 15:11:03.912 192.168.168.200:5000 read 7\
>       
>       :ST1,1\\n\
>       
>       
>       A sensor type of 1 is a "linear positioner with nano sensor",
>       according to the MCS RS-232 interface documentation.
>       
>       
>       I don't see any commands that would query a theoretical position
>       of an axis that doesn't have an encoder.  If SmarAct can provide
>       that information, we can modify the driver to use it.
>       
>       
>       Kevin
>       
>       
>       On 11/12/20 5:16 PM, Juliane Reinhardt wrote:
>       
> > Hi Mark,
> >         
> >         
> >         does the output in the txt attachment make more sense to you?
> >         
> >         
> >         Cheers,
> >         
> >         Juliane
> >         
> >         
> >         
> >         
> >       
>     
    
-- 
Juliane Reinhardt, PhD
Project Scientist | ALS Computing Group
Blg. 15-337E | phone: 510-486-4313
jreinhardt at lbl.gov
Lawrence Berkeley National Lab