Electronic shelf label system

摘要

An electronic shelf label (ESL) (12-1 to 12-n) transmits a negative response to a radio relay station (13-1 to 13-k) by means of weak radio waves if it failed to normally receive price information. On the other hand, the ESL (12-1 to 12-n) transmits no response if it failed to normally receive both ID information and price information. The radio relay station (13-1 to 13-k) transmits to a radio communication base station (16) ID information of the ESL which transmitted no response and ID information of the ESL which transmitted the negative response. The radio communication base station (16) transfers the received ID information to an electronic shelf label (ESL) server (14). The ESL server (14) re-transmits via the radio communication base station (16) information to the ESL which transmitted no response and the ESL which transmitted the negative response. <IMAGE>