Axle Counter Systems are becoming increasingly popular in the area of track vacancy systems with most rail operators having already installations of Axle Counter Systems or even fully switched to this modern and reliable technique of wheel detection. There are many advantages of using axle counters in comparison to track circuits, for example, lower life cycle costs, higher reliability and better management of long sections, special functions and further benefits. UniAC[2] system architecture allows both centralized and decentralized architectures. In all of those cases the communication with the subsequent signaling system can be realized by Relay, Optocoupler or a safe protocol interface.