Re: record with constant input link

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

Title: signature text

Gerrit,

One should not initialize the VAL field of a stringin record by setting the INP field to a string
(or the VAL field of a stringout record by setting DOL), as the field value might be interpreted as
a record name and the link as a channel access link.

Keep in mind that on records where INP expects a number, a constant value is used to initialize VAL, but
a constant INP link is only processed at record initialization. Writing a new value to INP via channel access
or dbput will not update the VAL field.

On 2023-11-03 8:37 a.m., Gerrit Kühn via Tech-talk wrote:

    ....
> Another issue I have been running into with this is the order of record
> initialisation. The string in this record is needed by other records and
> thus should be initialised first. But from what I have read on the web so
> far I understand there is no mechanism to guarantee that within one
> database. However, I probably could put records like this in a separate
> database and load that one in st.cmd first?
>

For this (within one IOC) you can use the PHAS field of a record. Records with smaller PHAS values are processed before records with higher values.

>

--
Rolf Keitel, Ph.D.
Researcher Emeritus
e-mail: rolf at triumf.ca
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