This read-write object selects which IRIG time-code format (such as a specific IRIG-B variant) is generated on this RS-422 output port. Admins must match this setting to what the receiving clock/device expects, since a mismatched time-code format prevents the downstream device from decoding accurate time. For example, when connecting a new GPS-synced clock display that expects a particular IRIG-B modulation, an admin sets this object to that specific code to ensure it can lock onto the signal.