Methods and apparatus for error detection and correction in an electronic shelf label system

Abstract

An electronic shelf label (ESL) system with register corrections is described. An ESL includes a plurality of registers for storing information controlling the content and formatting of information. A host computer system includes an ESL data file comprising a data image of the ESL's registers. The host computer calculates one or more sumchecks of the data image, and transmits one or more bedcheck messages including the sumchecks to the ESL. The ESL receives each bedcheck message and compares each received sumcheck with a sumcheck calculated using the information stored in the ESL's registers. If the received sumcheck matches the calculated sumcheck, the ESL transmits a positive acknowledgement message to the host computer. Otherwise, the ESL transmits a negative acknowledgment message to the host computer. The host computer then transmits a series of messages to the ESL updating the plurality of registers with the data image.