ZHC4922 is an industrial 4G RTU, providing 4 DI, 4 DO, 4 AI, and 1 RS485 interface. It supports local logic processing operations, automatic acquisition and active reporting, MQTT RTU/TCP adaptation, automatic calibration threshold reporting, Configuration software docking, dry and wet node IO detection and other features. Basic Informations : Chip : Quectel-EC20/25 Protocol :