RTU wireless module , also known as remote measurement and control terminal. It is an electronic device installed at a remote site, used to monitor and measure sensors and equipment installed at a remote site, and is responsible for monitoring and controlling on-site signals and industrial equipment. The RTU wireless module converts the measured status or signal into a data format that can be sent on the communication media, which can ideally realize the telemetry, remote control, remote signaling and remote adjustment functions of the enterprise’s central monitoring and dispatching system for primary instruments at the production site.
The RTU wireless module serves as the hub device between the serial device side and the platform side, and its communication protocol is also very important. Currently, most RTU wireless modules use the Modbus protocol, and Zongheng Intelligent Control has also adapted to the MQTT protocol that is currently popular in the Internet of Things.
The ZHC4922 independently developed and produced by Zongheng Intelligent Control is an industrial-grade 4G RTU wireless module that provides 4-channel DI, 4-channel DO, 4-channel AI and 1-channel RS485 interfaces. It supports local logic processing operations, automatic collection and active reporting, MQTT RTU/ Featured functions such as TCP self-adaptation, automatic calibration threshold reporting, configuration software docking, and wet and dry node IO detection support one-to-one and many-to-one networks. The configuration software interface window is visualized, enabling users to connect, debug, and configure on-site or remotely. The device can also be perfectly connected to the Alibaba Cloud IoT platform.
Advantages of MQTT protocol
MQTT was originally an instant messaging protocol developed by IBM. It is a protocol designed for communication with a large number of remote sensors and control devices that have limited computing power and work on low-bandwidth, unreliable networks. Its biggest advantage is that it has strong compatibility and can support all platforms. It can connect almost all networked items to the Internet.
The MQTT protocol can work with extremely low protocol overhead and low power consumption, and supports millions of client connections. In particular, MQTT can easily push notifications to clients, reducing the load on servers and clients. MQTT has many useful features suitable for IoT-oriented applications.
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