Teradek RT MK3.1 Camera Control Cable - Alexa, Amira For MK3.1 Receiver Use to trigger the run/stop function on ARRI and Amira Cameras with RS port. Hirose to 3pin Fischer 60cm Length To R/S on an ALEXA MINI please refer to MK3.1 Alexa Mini R/S - For MK3.1 Receiver[11-1446]