The ReadBias attribute specifies the bias setting for a field when the CurMode attribute for the frame is set to FM_READ.
If you set this attribute at a time when the CurMode is something other than FM_READ, it is not enforced until the CurMode setting is changed to FM_READ. If you set the CurBias attribute when the CurMode is FM_READ, this attribute is changed. If the field is a composite field, setting this attribute affects the children as well (see
CurBias Attribute for details).
The valid settings are the same as for
CurBias Attribute.