Re: usage of CALC

[Dirk Zimoch <dirk.zimoch@psi.ch>]

Hello Liang,

I would not use a calcout record. Use an ao record and scale the value 
using .ASLO. So the VAL field of the ao record can hols user coordinates 
(mm) abd the value sent to the device will be VAL/ASLO. Sthus you need 
to set ASLO to 0.05 (1/20).

Dirk


On 27.11.2014 15:52, 梁雅翔 wrote:
> Hi,
>      Sorry to bother you, I have some trouble which pullze me some time, could you please give me some advice.
>      I am trying to control a step motor.
>      Now I want to set a number(60) to pv(um distance), send the number*20(60*20=1200) to device. I think CALC would be useful. I could not understand CALC well though I have RRM 3-14.
>      The following code is what I do.
>
> Thanks!
>
> *******devKohzuAries.db
>
> record(longin,"RPS")  # send to device
> {
>      field(DESC, "move relativly")
>      field(DTYP, "stream")
>      field(INP,  "@devKohzuAries.proto RPS $(PORT) $(A)")
>      field(FLNK,"um distance")
> }
> record(calcout,"um distance")
> {
>      field(DTYP,"stream")
>      field(OUT,"@devKohzuAries.proto RPS $(PORT) $(A)")
>      field(CALC,"A*20")
>      field(INPA,"um distance.VAL")
> }
>
> ********  devKohzuAries.proto
> RPS{
>      out "\x02RPS1/5/%d/0";
> }
>
> Liang YX
>
> Institute of High Energy Physics
> Chinese Academy of Sciences
> P. O. Box 918, 100049 Beijing
> R. P. China
>
> Tel: 0086-0188235977-603
> Email: liangyx@ihep.ac.cn