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 or ENUM format (e.g. %i):

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

Output: x=RVAL
Input: RAL=x, VAL=RVAL>>SHFT

If MASK!=0:

Output: x=RVAL&MASK
Input: RBV=RVAL=x&MASK, VAL=RVAL>>SHFT

MASK is initialized to NOBT 1-bits shifted left by SHFT (((2^NOBT)-1)<<SHFT). The record calculates RVAL=VAL<<SHFT.

STRING format (e.g. %s):

Not allowed.

Initialization

During initialization, the @init handler is executed, if present.