The 125KHz antenna is part of the CDVI® PASS system. It transmits periodically a trigger signal (with a period of 0,5 - 2,4 Sec) with a predefined pattern to awake the active cards. Each single transmission lasts 34ms. External inputs allow synchronization with other antennas (up to 4). When sync-in and sync-out are left open, the gap between two transmissions is 2.4 Sec. When shorted, it is reduced to 500mS. The enable input handles the transmission. Before each transmission, the system controls this input and if it is left open, the transmission is inhibited. Using the onboard rotary trimmer, it is possible to assign an ID (0-9) to the antenna to distinguish it from the other. Additionally, inputs for two PIR sensors are provided ( internal and external one) to awake the antenna only in presence of movement.