The CYGNUS-V ventilation computer for pigs is available in two models; with 5A triac control and without triac control. The CYGNUS-V-5A has a triac control for controlling the fans, the CYGNUS-V (without triac) has a 0-10 Volt signal that is used to control the ventilation with a frequency regulator, for example. The Cygnus computers are equipped as standard with the can-comm module.