Patent ID: 7064673
Filing Date: 2006-06-20
Classification: G08B,G09F

Abstract:
1. A sign module, comprising: a display configured to display a message; a processor configured to control the display; and at least one communication port connected to the processor for communicating with a second sign module having a display; wherein the sign module, when used in association with a second sign module, is configured to determine whether to operate as a master sign module or a slave sign module relative to the second sign module; and if the sign module determines to operate as a master sign module, the sign module is configured to communicate with the second sign module to control the message on both its display and the display of the second sign module; and if the sign module determines to operate as a slave sign module, the sign module is configured to communicate with the second sign module and display a message received from the second sign module; otherwise when not used in association with a second sign module, the sign module is configured to control only the message on its display.