A communicating system has at least two air conditioning machines which are connected to a primary interface and a secondary interface, respectively. The primary interface is connected to a primary remote controller having a display. The secondary interface is connected to a secondary remote controller...http://www.google.es/patents/US5467078?utm_source=gb-gplus-sharePatente US5467078 - System and method for communicating data between plural air conditioning machines for controlling the machines and displaying their status
System and method for communicating data between plural air conditioning ...
