The transponders are operated at 128 kHz. The transmitting antenna of the reading unit supplies the transponder with energy by us- ing an alternating field of 128 kHz. This induces a voltage within the coil of the transponder, which generates a current that is sufficient power supply for the micro chip.
The system‘s operability is guaranteed through fluid, gaseous as well as solid material. However, if mounted directly on or within metal, the transponder‘s reading distance is influenced and the positioning signal may be distorted.
The Read-Write transponders are equipped with an EEPROM in which the code is stored. The EEPROM may be re- written up to more than 100,000 times.