Experimental Physics and
Industrial Control System

Ralph Lange <[email protected]> · Thu, 27 Nov 2014 16:42:49 +0100

Hi Liang,

There's a few things that do not make sense.

1. You have a longin *input* record that is connected to a protocol that

only writes to the device. Where do you expect this record to get its

value from?

2. Your calcout record is invalid: spaces are not allowed in record names.

3. The input A of your calcout points to itself: every time it

processes, it will multiply the previous value with 20 (according to

your CALC expression) and send it to the hardware. This is probably not

what you intend to do.

Assuming that you have your protocol right, and that the RPS record

should hold your number, you should be thinking along the lines of

record(longout,"RPS")  # relative distance
{
    field(DESC, "move relative")
    field(EGU,  "um")
    field(FLNK, "RPS_write PP")
}
record(calcout,"RPS_write")
{
    field(DTYP,"stream")
    field(OUT,"@devKohzuAries.proto RPS $(PORT) $(A)")
    field(CALC,"A*20")
    field(INPA,"RPS")
}

HTH,
~Ralph

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: [email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System