CPLD (Complex Programmable Logic Device)-based level conversion and switching device

The utility model discloses a CPLD (Complex Programmable Logic Device)-based level conversion and switching device, which comprises a CPU (Central Processing Unit), a signal generating device, a CPLD and a serial port transceiver, and the CPLD is respectively connected with the CPU, the signal generating device and the serial port transceiver and is used for receiving a switching instruction sent by the signal generating device and converting and switching UART (Universal Asynchronous Receiver/Transmitter) level of the CPU. The CPLD-based level conversion and switching device provided by the utility model has the characteristics of simple circuit structure, high flexibility, easy realization, high stability and good reliability; under the conditions that UART resources of the main chip are insufficient, levels are not matched and external interfaces of equipment need to realize various serial ports, an additional main chip and an additional level conversion chip do not need to be added. 本实用新型公开了一种基于CPLD的电平转换与