Hello，

  I am learning StreamDevice but meet a problem with StreamDevice. However I can not understand what the field(such as "PREC","LOPR","HOPR") means in these records:

record (ai, "PS1:I-get")
{
    field (DESC, "Read current of PS1")
    field (DTYP, "stream")
    field (INP,  "@ExamplePS.proto getCurrent PS1")
    field (EGU,  "A")
    field (PREC, "2")
    field (LOPR, "0")
    field (HOPR, "60")
    field (PINI, "YES")
    field (SCAN, "10 second")
}
record (ao, "PS1:I-set")
{
    field (DESC, "Set current of PS1")
    field (DTYP, "stream")
    field (OUT,  "@ExamplePS.proto setCurrent PS1")
    field (EGU,  "A")
    field (PREC, "2")
    field (DRVL, "0")
    field (DRVH, "60")
    field (LOPR, "0")
    field (HOPR, "60")
}

  https://paulscherrerinstitute.github.io/StreamDevice/setup.html

  Would you be able to provide me a way to learn that? 

Regards,

Yawei Zhang