A differential signal connector includes a plurality of pairs of signal contacts, a plurality of ground contacts, and an insulating housing holding the signal contacts and the ground contacts. A technician goes to each zone and sends a signal from the sensor, and the control then makes a change at the associated damper. Operation of the different structures of the system within the livestock house does not interfere with the items suspended from the ceiling of the livestock house. If, however, the signal quality is high, a simpler sub-optimal detector is used.