Experimental Physics and
Industrial Control System

Randall Cayford via Tech-talk <tech-talk at aps.anl.gov> · Wed, 10 Mar 2021 14:19:45 -0800

I’m trying to use StreamDevice to pass a long string to a controller.  Since it’s much longer than 40 characters, I’m using a waveform.  Here’s the protocol entry (though I’ve tried many other variants of the format specifier):

sety {
#  separator = " ";
  out “Y(%s)";
  in "YOKAY (%s)";
}

Here’s the db entry:
record (waveform, "$(PREFIX):ydata")
{
    field (DTYP, "stream")
    field (INP, "@mems.proto sety $(BUS)")
    field (NELM, 100)
    field (FTVL, "CHAR")
    field (SCAN, Passive)
}

Using an example:
caput -s  mems:ydata “68 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25”

I’ve tried a number of other variants , of course.

What gets sent in this case is “YD”.  So it’s pulling the first number, doing a string to integer conversion, then sending that ascii character (D) and ignoring the rest of the string.

Any ideas?

Thanks.

Randall

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System