该系统（C语言）设有五个按键，依次为单程、往返、暂停、清零、查询,通过相应的操作即可实现单程/往返模式选择、暂停计费、查询等待时间及费用、清除等功能。系统在电子软件仿真的基础上完成了硬件实物的测试和调试，达到了预设的所有功能要求，具有性能可靠、电路简单、成本低等特点。-The system (C language) has five buttons, followed by one-way, round trip, pause, clear, query, appropriate action can be achieved through one-way/round-trip mode selection, suspend billing inquiries, waiting time and cost, clear, etc. function. System based on electronic software emulation of the hardware on completion of the physical testing and debugging, reaching the preset all functional requirements, with reliable performance, the circuit is simple and low cost.