In a system for displaying prices in a retail store, an improved protocol is disclosed to permit improved communications between a host, or central computer and display devices. Such a protocol enables the host to effectively communicate messages to the display devices for the latter to display information...http://www.google.fr/patents/US5864325?utm_source=gb-gplus-shareBrevet US5864325 - Technique for communicating with electronic labels in an electronic price display system
Technique for communicating with electronic labels in an electronic price ...
