Re: Implementing transform field

[Rolf Keitel via Tech-talk <tech-talk at aps.anl.gov>]

Title: signature text

Hi Marco,

why don't you use a mbbiDirect record to read the modbus register and then 16 bi records pointing the INP fields of the bi records to the mbbiRecord's B0..BF fields.

- rolf -

On 2022-08-04 7:19 a.m., Marco A. Barra Montevechi Filho via Tech-talk wrote:

Good morning, all!
Im trying to implement the transform field in an IOC but im not getting the expected result:

i have an analog in record reading a bitmask value from a modbus register. Since the bitmask has 16 bits, i want to perform 16 bitwise operations to transform each bit in a binary in record thus transforming each 0 or 1 into a different string.

Since i dont want to need to create 16 calcout records, i thought i could use the transform record to perform all bitwise operations and push each one of them into a different binary in record. So after reading the documentation i tried to perform a calculation with transform just for testing:

record(ai, "${BL}:${H}:${EQ}:BitmaskGetter") {

    field(DESC, "Bitmask used by other pvs.")

    field(DTYP,"asynInt32")

    field(INP,"@asyn(SIP_EMODBUS_1_1_Rd_Status,0,1000)MODBUS_DATA")

    field(SCAN, "I/O Intr")

    field(FLNK, "${BL}:${H}:${EQ}:StatusSeparator")

}

record(transform, "${BL}:${H}:${EQ}:StatusSeparator"){

    field(DESC, "PV to process status bitmask")

    field(INPA, "${BL}:${H}:${EQ}:StatusBitmask")

    field(CLCA, "A+1")

    field(OUTA, "${BL}:${H}:${EQ}:EnableStatus")

    field(SCAN, "Passive")

}

record(bi, "${BL}:${H}:${EQ}:EnableStatus"){

    field(DESC, "Power supply status")

    field(ZNAM, "Stopped")

    field(ONAM, "Started")

}

So i expected that while caget in BitmaskGetter returns 0, caget into StatusSeparator.A would return 1 and EnableStatus would return "Started". It is not what happens: StatusSeparator returns 0 and EnableStatus returns "Stopped".

To test if the calculation is right, i tried substituting the transform record to a calc one:

record(ai, "${BL}:${H}:${EQ}:BitmaskGetter") {

    field(DESC, "Bitmask used by other pvs.")

    field(DTYP,"asynInt32")

    field(INP,"@asyn(SIP_EMODBUS_1_1_Rd_Status,0,1000)MODBUS_DATA")

    field(SCAN, "I/O Intr")

    field(FLNK, "test_calc")

}

record(calcout, "${BL}:${H}:${EQ}:StatusSeparator""){

    field(DESC, "PV to process status bitmask")

    field(INPA, "${BL}:${H}:${EQ}:StatusBitmask")

    field(CALC, "A+1")

    field(OUT, "${BL}:${H}:${EQ}:EnableStatus")

}

record(bi, "${BL}:${H}:${EQ}:EnableStatus"){

    field(DESC, "Power supply status")

    field(ZNAM, "Stopped")

    field(ONAM, "Started")

}

And now caget into StatusSeparator returns 1, StatusSeparator.A returns 0, BitmaskGetter returns 0 and EnableStatus returns "Started", as expected.

So i figure field OUTA from the transform record pushes the value in field A (which is zero) to the EnableStatus link. If this is the case, is there any way at all to push the result from CLCA to the EnableStatus link? Also,in which field is the result from CLCA field stored, if any?

Thanks in advance,

Marco

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Rolf Keitel, Ph.D.
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