StreamDevice: mbboDirect Records

Normal Operation

Depending on the format type, different record fields are used for output and input. The variable x stands for the written or read value.

DOUBLE format (e.g. %f):

Not allowed.

LONG format (e.g. %i):

If MASK==0 (because NOBT is not set):

Output: x=VAL
Input: VAL=x

If MASK!=0:

Output: x=RVAL&MASK
Input: RBV=x&MASK

MASK is initialized to NOBT 1-bits shifted left by SHFT.

ENUM format (e.g. %{):

Not allowed.

STRING format (e.g. %s):

Not allowed.

Initialization

During initialization, the @init handler is executed, if present. In contrast to normal operation, input is put to RVAL as well as to RBV and converted by the record if MASK!=0.

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Dirk Zimoch, 2005