[Introduction]：E290-900T20S is a new generation of wireless module, a UART wireless serial port module based on the Panqiwei PAN3060 RF chip, with multiple transmission modes, working in the (850.125~930.125MHz) frequency band (default 868.125MHz), using spread spectrum technology ChirpIoT™, TTL level output. The wireless module adopts a new generation of ChirpIoT™ spread spectrum technology, supports half-duplex wireless communication, has high anti-interference and high sensitivity; supports air wake-up, wireless configuration, automatic relay, communication key, AT command, IAP upgrade and other functions, supports sub-packet length setting, and can provide customized development services.