A Human-Machine Interface (HMI) is a user interface or dashboard that connects a person to a machine, system, or device. While the term can technically be applied to any screen that allows a user to interact with a device, HMI is most commonly used in the context of an industrial process Specification: Origin: CN(Origin) Certification: NONE Application: HMI Model Number : OP320 Input voltage: DC24V Voltage range: DC22V ~ DC26V Communication port : RS232 /RS422/RS485 Type: Yellow-green LCD Display area: 192*64 Software: V8.0Q Package Includes: 1 x Text display OP320 OP320-a Panel Screen HMI display with RS232 RS422 RS485