This read-only true/false object indicates whether the IRIG output group's extension-field/control detection feature is currently active, per the description covering the group's Control field. Admins use it to confirm the group correctly detects the control-field extension of the IRIG signal, which affects how extended time-code information is handled. For example, if downstream equipment expects extended IRIG control-field data but this object reads false, an admin would know the extension isn't being detected and would investigate further.