AIR CONDITIONING SYSTEM DEVICE

Japanese Patent JP3161814

B2

PURPOSE: To provide an air conditioning system device, capable of eliminating electric stress for the elements of a communication circuit in a concentrated control unit and respective air conditioning machines as much as possible by preventing excessive voltage increase in a transmission circuit whereby improv ing the life or the reliability of the elements of the communication circuit.
CONSTITUTION: A concentrated control unit Z transmits a transmission requesting command periodically to air conditioning machines. Respective air conditioning machines start data transmission immediately to respond the first transmission request command, however, the air conditioning machine continues the transmission only when the preferential order of the air conditioning machine is high and other machines stop the transmission when there is data collision upon starting the transmission. The air conditioning machine, which stopped the transmission, repeats retransmission at every predetermined time until the transmission stopping based on the data collision is eliminated and counts the number of times of the stopping of transmission. With respect to the transmission request of second times, respective air conditioning machines transmit data while waiting a delay time based on the number of counts of respective machines for the transmission request from a second time.

JPS523750	CONTINUOUSLY COOLING METHOD AND APPARATUS WITH THE CHANGEOVER REFRIGER ATING CYCLE UTILIZING AN AIR-COOLING REFRIGERATING DEVICE
JPH11344248	REMOTE-MONITORING SYSTEM OF AIR CONDITIONER

Isao Takahashi

JP17253792A

April 25, 2001

June 30, 1992

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Toshiba Carrier Corporation

F24F11/02; H04Q9/00; (IPC1-7): F24F11/02; H04Q9/00

JP3221749A
JP60103244A

Takehiko Suzue

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