CK-S640-AP60S is a low-frequency RFID tag reader based on radio frequency identification technology with a working frequency of 134.2kHz. The card reader supports the standard industrial semiconductor SECS protocol and Modbus RTU protocol, which is convenient for users to apply to systems such as semiconductor processing controllers or PLCs. There are three mode switch selectors outside the device, which is convenient for users to directly set the working mode, communication rate and device address. The card reader integrates the radio frequency part of the communication protocol. The user only needs to send and receive data through the RS232/RS485 communication interface to complete the reading operation of the tag, without understanding the complex radio frequency communication protocol.