Electronic price tag system, electronic price tag, and guide rail apparatus for mounting electronic price tag

An electronic price tag system, comprising:

• a guide rail apparatus (1) comprising a guide rail (10), a plurality of positioning electrodes (11) successively arranged on the guide rail (10) at intervals along an extension direction of the guide rail (10), and first resistors (12) connected in series between adjacent two of the positioning electrodes (11), wherein a positioning electrode (11) located at a tail end is grounded;
• an electronic price tag (2) comprising a price tag body (20), and a power-source positive-electrode connecting piece (21), a power-source negative-electrode connecting piece (22) and a conductive contact piece (23), which are arranged on the price tag body (20), wherein the power-source positive-electrode connecting piece (21) and the power-source negative-electrode connecting piece (22) are configured to be used for connecting to a power source, and the power-source positive-electrode connecting piece (21) and the conductive contact piece (23) are electrically connected by means of a second resistor (25);
• wherein the electronic price tag (2) is configured to make the conductive contact piece (23) come into contact with one of the positioning electrodes (11) in a positioning measurement mode after the electronic price tag (2) is mounted on the guide rail (10), such that the power-source positive-electrode connecting piece (21) outputs a high level and a voltage across the second resistor (25) is measured, and the voltage across the second resistor (25) is configured to be used for determining whether the price tag body (20) is at a target position on the guide rail (10).