Counter 
 In the yard where there are multiple partitions, customers need to show the number of vehicles each region, we in the regions to increase channel count devices, a passage of a counter, counter and sensors used in conjunction, for the single run, a counter and a sensor connected to it for dual-channel, a counter connected to two sensors determine the direction of movement of vehicles. Counter and computer communication using RS422 communication. Yards in a reader device count on the need to install the channel, while the signals through a card reader to determine the direction of movement of vehicles.