| 摘要 |
The present invention relates to a price information system which includes a plurality of price information units (18) for displaying changeable information in, for instance, a shop or store. The system includes a main computer unit (10) which is connected to a communication unit (12). The information supplied to the computer unit (10) is transmitted to the communication unit (12). The communication unit transmits this information inductively, i.e. wire-less, to the various price information units (18), via a loop pair (14). The information is transmitted in the form of a sequence of messages, wherein the position of a message in the sequence denotes the price information unit (18) for which the message is intended according to a predetermined order sequence. When a price information unit (18) has received its specific message, the unit transmits a response signal to the communication unit (12). If the range of the communication unit (12) is too small for the shop in question, a number of slave units (16) with connected loop pairs (14) can be connected to the communication unit (12). |
