Introduction
The SKAARHOJ B4 Links are used for remote control iris on B4 lenses connected to BMD cameras. There
are two models available the Eth-B4 Link which communicates via UDP connection from a networked
Skaarhoj controller and the SDI-B4 Link which receives iris command from a 3G SDI feed from either a
Blackmagic Atem or another SKAARHOJ controller.
The SDI-B4 Link extracts iris information from 3G-SDI input signal according to Blackmagic Designs
Camera Control Protocol. Outputs analog B4 lens iris control (Hirose-12), tally LED and relay. Supports
camera 1-10 by multi-position switch. SDI input passed through on SDI out.
The Eth-B4 Link is similar to the!SDI-B4!Link but the data input is via network instead of SDI. The protocol
is also Blackmagic Camera Control, but over UDP (“UDP Camera Control”) and typically served by a
SKAARHOJ controller. Has an incredibly light and compact form factor. 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).
Eth-B4 Link Port Information
SDI-B4 Link 3G SDI Shield Information
The SDI-B4 Link uses the Blackmagic Design 3G-SDI Shield. The Blackmagic 3G-SDI Arduino Shield
supports the following formats using SDI Level B:!720p50, 720p59.94, 720p60, 1080i50, 1080i59.94,
1080i60, 1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 1080p50 (output only), 1080p59.94
(output only) and 1080p60 (output only), but the camera does not have to be running the same video
format as the program input, so you can use cameras in Ultra HD while the camera protocol is sent over
HD signal to the camera.
!
