With the SKAARHOJ ETH-B4 Link the iris control data is sent separately from the camera control data over ethernet instead of over SDI. The ETH-B4 Link has a camera selector switch that sets it's camera ID filter as well as its IP address and the iris data it receives is output on the Hirose-12 connector. It also features a tally lamp (red/green) and a relay output (PGM tally out).